Accu-Guard Series Catalog Datasheet by AVX Corporation

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/A\V/) H A KYOCERA GROUP COMPANY
Accu-Guard Series LGA/SMD
Thin-Film Fuse
102120 -1
/.‘.\V/)I(' Ammmw comm [AVAIC |
IMPORTANT INFORMATION/DISCLAIMER
All product specifications, statements, information and data (collectively, the “Information”) in this datasheet
or made available on the website are subject to change. The customer is responsible for checking and verifying
the extent to which the Information contained in this publication is applicable to an order at the time the order is
placed. All Information given herein is believed to be accurate and reliable, but it is presented without guarantee,
warranty, or responsibility of any kind, expressed or implied.
Statements of suitability for certain applications are based on AVX’s knowledge of typical operating conditions
for such applications, but are not intended to constitute and AVX specifically disclaims any warranty concerning
suitability for a specific customer application or use.
ANY USE OF PRODUCT OUTSIDE OF SPECIFICATIONS OR ANY STORAGE OR INSTALLATION
INCONSISTENT WITH PRODUCT GUIDANCE VOIDS ANY WARRANTY.
The Information is intended for use only by customers who have the requisite experience and capability to
determine the correct products for their application. Any technical advice inferred from this Information or
otherwise provided by AVX with reference to the use of AVX’s products is given without regard, and AVX
assumes no obligation or liability for the advice given or results obtained.
Although AVX designs and manufactures its products to the most stringent quality and safety standards, given
the current state of the art, isolated component failures may still occur. Accordingly, customer applications
which require a high degree of reliability or safety should employ suitable designs or other safeguards (such as
installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component
does not result in a risk of personal injury or property damage.
UNLESS SPECIFICALLY AGREED TO IN WRITING, AVX HAS NOT TESTED OR CERTIFIED ITS PRODUCTS,
SERVICES OR DELIVERABLES FOR USE IN HIGH RISK APPLICATIONS INCLUDING MEDICAL LIFE
SUPPORT, MEDICAL DEVICE, DIRECT PHYSICAL PATIENT CONTACT, WATER TREATMENT, NUCLEAR
FACILITIES, WEAPON SYSTEMS, MASS AND AIR TRANSPORTATION CONTROL, FLAMMABLE
ENVIRONMENTS, OR ANY OTHER POTENTIALLY LIFE CRITICAL USES. CUSTOMER UNDERSTANDS AND
AGREES THAT AVX MAKES NO ASSURANCES THAT THE PRODUCTS, SERVICES OR DELIVERABLES
ARE SUITABLE FOR ANY HIGH-RISK USES. UNDER NO CIRCUMSTANCES DOES AVX WARRANT OR
GUARANTEE SUITABILITY FOR ANY CUSTOMER DESIGN OR MANUFACTURING PROCESS.
Although all product–related warnings, cautions and notes must be observed, the customer should not assume
that all safety measures are indicted or that other measures may not be required.
121119
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
AAAAAAAAAAAAAAAAAAAAA |:| /e‘s\Y/>l(_ |
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard Series
LGA/SMD Thin-Film Fuse
Table of Contents
Accu-Guard®
Introduction .......................................................................................................................................................................................................................................... 1
• ACCU–GUARD® TECHNOLOGY
• FEATURES
• DIMENSIONS
HOW TO ORDER
• APPLICATIONS
• APPROVAL FILE NUMBERS
Accu-Guard® II Low Current
LGA Miniature 0402 and 0603 Size Thin-Film Fuses ...................................................................................................................................................... 2
• ELECTRICAL SPECIFICATIONS
• ENVIRONMENTAL CHARACTERISTICS
• RECOMMENDED PAD LAYOUT
FUSE TIME–CURRENT CHARACTERISTICS ...................................................................................................................................... 3
• FUSE PRE–ARC JOULE INTEGRALS VS CURRENT ........................................................................................................................... 4
• FUSE PRE–ARC JOULE INTEGRALS VS PRE–ARC TIME ................................................................................................................. 5
Accu-Guard® II
SMD Thin-Film Fuse ......................................................................................................................................................................................................................... 6
• ELECTRICAL SPECIFICATIONS
• ENVIRONMENTAL CHARACTERISTICS ............................................................................................................................................. 7
Lead-Free SMD Thin-Film Fuse .................................................................................................................................................................................................. 8
• FUSE TIME – CURRENT CHARACTERISTICS FOR TYPE F0402E (TYPICAL)
• FUSE PRE-ARC JOULE INTEGRALS VS CURRENT FOR TYPE F0402E (TYPICAL) .......................................................................... 9
• FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME FOR TYPE F0402E (TYPICAL) ................................................................ 10
• FUSE TIME – CURRENT CHARACTERISTICS FOR TYPE F0603E (TYPICAL) ................................................................................ 11
• FUSE PRE-ARC JOULE INTEGRALS VS CURRENT FOR TYPE F0603E (TYPICAL) ........................................................................ 12
• FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME FOR TYPE F0603E (TYPICAL) ................................................................ 13
SMD Thin-Film Fuse ....................................................................................................................................................................................................................... 14
• FUSE TIME - CURRENT CHARACTERISTICS FOR TYPE F0603C (TYPICAL)*
• FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT FOR TYPE F0603C (TYPICAL)* ..................................................................... 15
• FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME FOR TYPE F0603C (TYPICAL)* ............................................................. 16
• FUSE TIME - CURRENT CHARACTERISTICS FOR TYPES F0805B AND F1206B (TYPICAL) ........................................................ 17
• FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT TIME FOR TYPES F0805B AND F1206B (TYPICAL) .................................... 18
• FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME FOR TYPES F0805B AND F1206B (TYPICAL) ...................................... 19
• FUSE TIME - CURRENT CHARACTERISTICS FOR TYPE F0612D (TYPICAL)* ............................................................................... 20
• FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME FOR TYPE F0612D (TYPICAL)* ............................................................. 21
Accu-Guard® Type 1206A*
SMD Thin-Film Fuse ...................................................................................................................................................................................................................... 23
• ELECTRICAL SPECIFICATIONS
• ENVIRONMENTAL CHARACTERISTICS
• FUSE TIME - CURRENT CHARACTERISTICS FOR SIZE 1206 (TYPICAL) ....................................................................................... 24
• FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT FOR SIZE 1206 (TYPICAL)............................................................................. 25
• FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME FOR SIZE 1206 (TYPICAL) .................................................................... 26
*Not recommended for new designs, please contact factory
/A\V/)I(“ A «vocm emu; commw /A\"./>Z( |
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
SMD Thin-Film Fuse Handling and Soldering ................................................................................................................................................................... 27
• QUALITY & RELIABILITY
• HANDLING AND SOLDERING
CIRCUIT BROAD TYPE
• WAVE SOLDERING Dimensions
• COMPONENT PAD DESIGN
• PREHEAT & SOLDERING
• HAND SOLDERING & REWORK
• COOLING
• REFLOW SOLDERING Dimensions
• RECOMMENDED SOLDERING PROFILES ........................................................................................................................................ 28
• CLEANING RECOMMENDATIONS
• STORAGE CONDITIONS
• Automatic Insertion Packaging ........................................................................................................................................................ 29
• REEL DIMENSIONS
• CARRIER DIMENSIONS
Fuse Selection Guide ..................................................................................................................................................................................................................... 30
• HOW TO CHOOSE THE CORRECT ACCU–GUARD FUSE FOR CIRCUIT PROTECTION
• DESIGN PARAMETERS
• DESIGNING FOR CURRENT PULSE SITUATIONS ............................................................................................................................ 31
Accu-Guard Series
LGA/SMD Thin-Film Fuse
Table of Contents
”M A man smur- c RoHS commun- \\1 I‘W L i F Q?“ \/ /\ n—l'n 1206
1
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
APPLICATIONS
Two-Way Radios
Home Appliances
Battery Management Systems
Battery Chargers
Rechargeable Battery Packs
Computers
Hard Disk Drives
PDAs
LCD Screens
SCSI Interface
Digital Cameras
Video Cameras
APPROVAL FILE NUMBERS
UL, cUL: RCD#E143842
Accu-Guard®
Introduction
091720
ACCU–GUARD® TECHNOLOGY
The Accu-Guard® series of fuses is based on thin-film techniques. This
technology provides a level of control on the component electrical and
physical characteristics that is generally not possible with standard fuse
technologies. This has allowed AVX to offer a series of devices which are
designed for modern surface mount circuit boards which require protection.
FEATURES
Accurate current rating
Fast acting
Small-standard 0402, 0603, 0805, 1206 and 0612 chip sizes
Taped and reeled
Completely compatible with all soldering systems used for SMT
Lead Free Series (F0402G, F0603G, F0402E, F0603E,
F0805B, F1206B)
DIMENSIONS
For RoHS compliant products, please
select correct termination style.
HOW TO ORDER
F0402E and F0603EF0603C, F0805B, F1206A and F1206B F0402G and F0603G
Rated Current
Current expressed in
Amps. Letter R de-
notes decimal point
e.g. 0.20A=0R20
1.75A=1R75
0R20
Fuse Speed
F=Fast
F
S=Nickel/Lead-Free
Solder coated
(Sn 100), SMD
W=Nickel/solder coated
(Sn 63, Pb 37)
Solder Coated (Sn100)
N=Nickel/Lead-Free
Solder Coated (Sn100), LGA
Termination
W
TR=Tape and reel
Packaging
TR
Product
Fuse
F
Size
See table for
standard sizes
1206
A=Accu-Guard®
B=Accu-Guard® II
C=Accu-Guard® II 0603
D=Accu-Guard® II 0612
E=Accu-Guard® II 0402, 0603
G=Accu-Guard® II Low Current
0402, 0603
Fuse Version
A
L
T
B
1
W
B
2
B
T
L
W
L
T
S
W
AB
H
F0402G F0603G F0402E F0603E F0603C F0805B F1206A/B F0612D
L1.00±0.05
(0.039±0.002)
1.60±0.10
(0.063±0.004)
1.00±0.10
(0.039±0.004)
1.60±0.10
(0.063±0.004)
1.65±0.25
(0.065±0.010)
2.10±0.20
(0.083±0.008)
3.10±0.20
(0.122±0.008)
1.65±0.25
(0.065±0.010)
W0.58 ±0.04
(0.023±0.002)
0.81±0.10
(0.032±0.004)
0.55±0.07
(0.022±0.003)
0.81±0.10
(0.032±0.004)
0.80±0.15
(0.031±0.006)
1.27±0.10
(0.050±0.004)
1.60±0.10
(0.063±0.004)
3.10±0.20
(0.122±0.008)
T0.35±0.05
(0.014±0.002)
0.61±0.10
(0.024±0.004)
0.40±0.10
(0.010.004)
0.63±0.10
(0.025±0.004)
0.70±0.15
(0.028±0.006)
0.90±0.2
(0.035±0.008)
1.20±0.20
(0.047±0.008)
0.90±0.20
(0.036±0.008)
B0.48±0.05
(0.019±0.002)
0.71±0.05
(0.028±0.002)
0.20±0.10
(0.008±0.004)
0.35±0.15
(0.014±0.006)
0.35±0.15
(0.014±0.006)
0.30±0.15
(0.010.006)
0.43±0.25
(0.017±0.010)
0.35±0.15
(0.014±0.006)
A0.20±0.05
(0.008±0.002)
0.28±0.05
(0.011±0.002)
S, H 0.05±0.05
(0.000.002)
0.06±0.05
(0.000.002)
millimeters (inches)
2The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II Low Current
LGA Miniature 0402 and 0603 Size Thin-Film Fuses
072320
ENVIRONMENTAL CHARACTERISTICS
RECOMMENDED PAD LAYOUT
The new F0402G and F0603G Accu-Guard® series of fuses is based on thin-
film technology which allows precise control of the component electrical and
physical characteristics that is not possible with standard fuse technologies.
The Accu-Guard Low Current series encompasses the lowest current ratings
in compact 0402 and 0603 packages and features LGA terminations.
ELECTRICAL SPECIFICATIONS
Operating temperature: -55°C to +125°C
Current carrying capacity:
-55°C to -11°C 107% of rating
-10°C to +60°C 100% of rating
+61°C to +100°C 85% of rating
+101°C to +125°C 80% of rating
Rated voltage: 63V (F0603G), 32V (F0402G)
Post-fusing resistance: >1MΩ
Interrupt rating: 50A
millimeters (inches)
F0402G
F0603G
0.55
(0.022)
1.15 (0.045)
0.31 (0.012)
0.85 (0.033)
2.4 (0.095)
1.1
(0.043)
Part Number
Current
Rating
A
Resistance
@0.1 x I rated
Ω (max.)
Voltage Drop
@ I rated
mV (max.)
Fusing Current
(within 5 sec)
A
Pre-Arc I2t
@10x I rated A2-
sec (typ)
Color
Code
F0402G0R02FNTR F0603G0R02FNTR 0.028 7.5 290 0.070 6 x 10-7 Green
F0402G0R03FNTR F0603G0R03FNTR 0.0375 4.8 230 0.094 8 x 10-7 Red
F0402G0R05FNTR F0603G0R05FNTR 0.050 3.4 250 0.125 2 x 10-6 Blue
F0402G0R06FNTR F0603G0R06FNTR 0.062 2.5 280 0.155 2 x 10-6 Yellow
F0402G0R07FNTR F0603G0R07FNTR 0.075 2.0 280 0.188 4 x 10-6 Brown
F0402G0R10FNTR F0603G0R10FNTR 0.100 2.4 300 0.250 7 x 10-6 Red
F0402G0R12FNTR F0603G0R12FNTR 0.125 1.6 250 0.312 1 x 10-5 White
F0402G0R15FNTR F0603G0R15FNTR 0.150 1.2 220 0.375 2 x 10-5 Green
F0402G0R20FNTR F0603G0R20FNTR 0.200 0.8 210 0.500 4 x 10-5 Pink
Test Conditions Required
Solderability Components completely immersed in a solder bath
at 245 ±C for 3 secs.
Total area of imperfections in solder
coatup to 5% of the land suface area
Leach
Resistance
Components completely immersed in a solder bath
at 255 ±5°C for 60 secs.
Dissolution of termination
≤ 15% of the land surface area
Storage 12 months minimum with components stored in “as
received” packaging. Good solderability
Shear
Components mounted to a substrate. Increasing
shearing force applied paralled to the sufstrate till
destruction.
Destruction at 5N force minimum
Temperature
Cycling
Components mounted to a flexible substrate (e.g.
FR – 4). 1000 cycles -55ºC to +125ºC.
No Visible damage
∆R/R<10%
Bend
Tested as shown in diagram
45mm 45mm
3 mm
Deflection
No visible damage
∆R/R<10%
/.‘.\V/)X“ A mew emu; commw Pre—Arc Time, sec /A\V/)I(_ |
3
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II Low Current
LGA Miniature 0402 and 0603 Size Thin-Film Fuses
090518
FUSE TIME–CURRENT CHARACTERISTICS
0.01 0.11
10
Current, Amp
100 mA
125 mA
150 mA
50 mA
62 mA
75 mA
10-2
10-1
10-3
1
10
10-6
10-5
10-4
Pre-Arc Time, sec
200 mA
37.5 mA
28 mA
/A\V/)I(” A KVOCERA emu; commw Pre—Arc Izt, Azsec /A\V/>Z( | 200 3150mA33125mA31o
4The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II Low Current
LGA Miniature 0402 and 0603 Size Thin-Film Fuses
090518
00.5 11.5 22.5
3
Current, Amp
50 mA
62 mA
75 mA
100 mA
125 mA150 mA
10-2
10-1
10-3
1
10-6
10-5
10-4
200 mA
10
37.5 mA
10-7
28 mA
Pre-Arc I²t, A²sec
FUSE PRE–ARC JOULE INTEGRALS VS CURRENT
/A\V/)I(” A KVOCERA emu; commw Pre-Arc Pt, Azsec OmA /e‘s\Y/>Z( | 7150mA 77125mA 100 mAV 775mA
5
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II Low Current
LGA Miniature 0402 and 0603 Size Thin-Film Fuses
090518
10-2
10-1
10-3
1
10-6
10-5
10-4
50 mA
62 mA
75 mA100 mA125 mA150 mA
10
200 mA
10-7
37.5 mA
28 mA
Pre-Arc I²t, A²sec
Pre-Arc Time, sec
10-2 10-1
10-3 1
10-6 10-5 10-4 10
FUSE PRE–ARC JOULE INTEGRALS VS PRE–ARC TIME
”M A man snow c
6The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
SMD Thin-Film Fuse
011419
Accu-Guard® II is a version of Accu-Guard® fuses for a wider range of current
and voltage ratings. Constructed on alumina substrates, Accu-Guard® II
fuses display superior electrical, mechanical and environmental properties.
Accu-Guard® II dimensions are standard 0402, 0603, 0805, 1206 and 0612
chip sizes, see page 2.
ELECTRICAL SPECIFICATIONS
Operating temperature: -55°C to +125°C
Current carrying capacity:
For F0402E and F0603E at -55°C 107% of rating, at +25°C 100% of rating, at
+125°C 80% of rating. For F0603C at -55°C is 107% of rating, at +25°C 100%
of rating, at +85°C 90% of rating, at +125°C 75% of rating
Type Part Number
Current
Rating
A
Resistance
10% x I rated, 25°C
Ω (max.)
Voltage Drop
@1 x I rated, 25°C
mV (max.)
Fusing Current
(within 5 sec), 25°C
A
Pre-Arc
I2t @ 50A
A2-sec
Rated
Voltage
V
F0402E
F0402E0R25FSTR 0.25 0.650 220 0.625 0.00005* 32
F0402E0R50FSTR 0.50 0.250 180 1.25 0.0003 32
F0402E0R75FSTR 0.75 0.200 180 1.875 0.003 32
F0402E1R00FSTR 1.00 0.130 160 2.50 0.008 32
F0402E1R50FSTR 1.50 0.060 140 3.75 0.03 32
F0402E2R00FSTR 2.00 0.040 120 5.00 0.06 32
F0603E
F0603E0R25FSTR 0.25 0.650 220 0.625 0.00005* 32
F0603E0R37FSTR 0.375 0.450 220 0.940 0.0001 32
F0603E0R50FSTR 0.50 0.250 180 1.25 0.0003 32
F0603E0R75FSTR 0.75 0.200 180 1.875 0.003 32
F0603E1R00FSTR 1.00 0.130 160 2.50 0.008 32
F0603E1R25FSTR 1.25 0.090 140 3.125 0.01 32
F0603E1R50FSTR 1.50 0.060 140 3.75 0.03 32
F0603E1R75FSTR 1.75 0.050 120 4.375 0.04 32
F0603E2R00FSTR 2.00 0.040 120 5.00 0.06 32
F0603E2R50FSTR 2.50 0.035 100 6.25 0.12 32
F0603E3R00FSTR 3.00 0.030 100 7.50 0.25 32
F0603C
F0603C0R25FWTR 0.25 0.800 280 0.50 0.00003* 32
F0603C0R37FWTR 0.375 0.500 280 0.75 0.0001 32
F0603C0R50FWTR 0.50 0.320 280 1.00 0.0002 32
F0603C0R75FWTR 0.75 0.300 280 1.50 0.0015 32
F0603C1R00FWTR 1.00 0.200 240 2.00 0.004 32
F0603C1R25FWTR 1.25 0.170 240 2.50 0.007 32
F0603C1R50FWTR 1.50 0.110 240 3.00 0.012 32
F0603C1R75FWTR 1.75 0.090 240 3.50 0.02 24
F0603C2R00FWTR 2.00 0.075 240 4.00 0.03 24
F0603C2R50FWTR 2.50 0.055 200 5.00 0.05 16
F0603C3R00FWTR 3.00 0.045 200 6.00 0.1 16
F0805B
F0805B0R25FW/STR 0.25 0.750 280 0.50 0.00003* 63
F0805B0R50FW/STR 0.50 0.350 280 1.00 0.0002 63
F0805B0R75FW/STR 0.75 0.270 280 1.50 0.001 63
F0805B1R00FW/STR 1.00 0.220 280 2.00 0.003 63
F0805B1R25FW/STR 1.25 0.170 280 2.50 0.007 63
F0805B1R50FW/STR 1.50 0.120 240 3.00 0.010 63
F0805B2R00FW/STR 2.00 0.080 220 4.00 0.030 63
F0805B2R50FW/STR 2.50 0.060 220 5.00 0.050 63
F0805B3R00FW/STR 3.00 0.050 220 6.00 0.10 63
F1206B
F1206B0R25FW/STR 0.25 0.750 280 0.50 0.00003 63
F1206B0R50FW/STR 0.50 0.350 280 1.00 0.0002 63
F1206B1R00FW/STR 1.00 0.180 240 2.00 0.003 63
F1206B1R50FW/STR 1.50 0.120 240 3.00 0.010 63
F1206B2R00FW/STR 2.00 0.080 220 4.00 0.030 63
F1206B3R00FW/STR 3.00 0.050 220 6.00 0.10 63
F0612D F0612D4R00FWTR 4.00 0.040 260 10 0.10 32
F0612D5R00FWTR 5.00 0.025 200 12.5 0.25 32
*Current is limited to less than 50A at 32V due to internal fuse resistance.
For F1206B and F0805B at -55°C is 107% of rating, at +25°C 100% of rating,
at +85°C 93% of rating, at +125°C 90% of rating. For F0805B 2.50A and 3.00A
at +85°C 90% of rating, at +125°C 90% of rating.
Interrupting rating: 50A.
Insulation resistance: >20MΩ guaranteed (after fusing at rated voltage).
For F0612D at -55°C 107% of rating, at +25°C 100% of rating, at +85°C 80% of
rating, at +125°C 75% of rating.
”M A mum emu; c
7
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
SMD Thin-Film Fuse
090518
ENVIRONMENTAL CHARACTERISTICS
Test Conditions Required
Solderability Components completely immersed in a solder
bath at 235 ±C for 2 secs. Terminations to be well tinned No visible damage
Leach Resistance Completely immersed in a solder bath at 260 ±5°C
for 60 secs
Dissolution of termination
≤ 25% of area
∆R/R<10%
Storage 12 months minimum with components stored in
“as received” packaging. Good solderability
Shear
Components mounted to a substrate.
A force of 5N applied normal to the line joining the
terminations and in a line parallel to the substrate
No visible damage
Rapid Change of
Temperature
Components mounted to a substrate. 50 cycles
-55° to +125°C.
No Visible damage
∆R/R<10%
Vibration Components mounted to substrate.
50 cycles -55°C to +125°C.
No Visible damage
∆R/R<10%
Vibration Components mounted to substrate.
50 cycles -55°C to +125°C.
No Visible damage
∆R/R<10%
Bend
Tested as shown in diagram
45mm 45mm
3 mm
Deflection
No visible damage
∆R/R<10%
Load Life
F0805B, F1206B 25°C, rated current, 20,000 hrs. No visible damage
∆R/R<10%
/A\V/)I(” A KVOCERA emu; commw /A\Y/X( |
8The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
072619
0.1 1 10 100
Current, Amp
e-
A
rc
me,
10
-2
10
-1
10
-3
1
10
10
-6
10
-5
10
-4
2.0
A
1.5
A
1.0
A
0.5
A
0.25
A
0.75
A
FUSE TIME CURRENT CHARACTERISTICS FOR TYPE F0402E (TYPICAL)
/.‘.\V/)I(” A KVOCERA emu; cowwv 100 WAX |
9
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
090518
100
10
1
10-1
10-2
10-3
10-4
10-5
10-6
0 10 20 30 40 50 60
Current, Amp
Pr
e-
A
rc
I
2
t,
A
2
sec
2.0
A
1.5
A
1.0
A
0.5
A
0.25
A
0.75
A
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT FOR TYPE
F0402E (TYPICAL)
/A\V/)I(” A KVOCERA emu; commw /A\Y/X( |
10 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
010319
0
100
0
Pre-Arc Time, sec
Pr
e-
Arc
I
2
t,
A
2
sec
10
-2
10
-1
10
-3
1
100
10
-6
10
-5
10
-4
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
1
10
2.0
A
1.5
A
1.0
A
0.5
A
0.25
A
0.75
A
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME FOR TYPE
F0402E (TYPICAL)
/A\V/)I(” A wocm emu; commv /;.\V/)I(_ |
11
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
090518
10
1
10-1
10-2
10-3
10-4
10-5
10-6
0.1 110 100
Current, Amp
Pre-
Arc
Time,
sec
2.0
A
2.5
A
3.0
A
1.5
A
1.75
A
1.0
A
0.5
A
0.75
A
0.37 5
A
0.25
A
1.25
A
FUSE TIME CURRENT CHARACTERISTICS FOR TYPE
F0603E (TYPICAL)
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
12 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
090518
0102030405
060
Current, Amp
Pre-Arc I
2
t, A
2
sec
100
10
1
10-1
10-2
10-3
10-4
10-5
10-6
3.0A
2.5A
2.0A
1.75A
1.5A
1.25A
1.0A
0.75A
0.5A
0.375A
0.25A
FUSE PRE-ARC JOULE INTEGRALS VS CURRENT FOR
TYPE F0603E (TYPICAL)
/A\V/)I(e A wocm emu; chPAM /;.\V/)I(_ |
13
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
Lead-Free SMD Thin-Film Fuse
090518
Pre-Arc Time, sec
Pr
e-
Arc
I
2
t,
A
2
sec
10
-2
10
-1
10
-3
1
100
10
-6
10
-5
10
-4
10
10
-6
10
-5
10
-4
10
-3
10
-2
10
-1
11
0
3.0A
2.5A
2.0A
1.75A
1.5A
1.25A
1.0A
0.75A
0.5A
0.375A
0.25A
FUSE PRE-ARC JOULE INTEGRALS VS PRE-ARC TIME
FOR TYPE F0603E (TYPICAL)
/.‘.\V/)Xe A wocm emu; commw /;.\V/)I(_ |
14 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
SMD Thin-Film Fuse
011419
0.15A
0.25A
0.375A
0.50A
0.75A
1.00A
1.25A
1.5A
1.75A
2.0A
2.5A
3.0A
10-1
1
10
0.1 110
Current, Amp
Pre-Arc Time, Seconds
100
10-2
10-3
10-4
10-5
10-6
FUSE TIME - CURRENT CHARACTERISTICS FOR TYPE
F0603C (TYPICAL)**Not recommended for new designs,
please contact factory
/.‘.\V/)Xe A wocm emu; comm /;.\V/)I(_ |
15
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
011419
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
10-6
50403020100 60
3.00A
2.50A
2.00A
1.75A
1.50A
1.25A
1.00A
0.75A
0.50A
0.375A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT FOR
TYPE F0603C (TYPICAL)**Not recommended for new designs,
please contact factory
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
16 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
011419
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
10-6
10-7 10-6 10-5 10-4 10-3 10-2 10-1 110
3.00A
2.50A
2.00A
1.50A
1.25A
1.00A
0.75A
0.50A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME
FOR TYPE F0603C (TYPICAL)**Not recommended for new designs,
please contact factory
/.‘.\V/)Xe A wocm emu; comm /;.\V/)I(_ |
17
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
090518
Accu-Guard® II
SMD Thin-Film Fuse
0.15A
0.25A
0.375A
0.50A
0.75A
1.00A
1.25A
1.5A
1.75A
2.0A
2.5A
3.0A
10-1
1
10
0.1 110
Current, Amp
Pre-Arc Time, Seconds
100
10-2
10-3
10-4
10-5
10-6
FUSE TIME - CURRENT CHARACTERISTICS FOR TYPES
F0805B AND F1206B (TYPICAL)
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
18 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
090518
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
10-6
50403020100 60
3.00A
2.50A
2.00A
1.50A
1.25A
1.00A
0.75A
0.50A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT TIME
FOR TYPES F0805B AND F1206B (TYPICAL)
/A\V/)I(e A wocm emu; chPAM /;.\V/)I(_ |
19
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
090518
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
100
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
10-6
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
3.00A
2.50A
2.00A
1.50A
1.25A
1.00A
0.75A
0.50A
0.25A
0.15A
FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME
FOR TYPES F0805B AND F1206B (TYPICAL)
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
20 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
011419
Accu-Guard® II
SMD Thin-Film Fuse
10-1
1
10
110
Current, Amp
Pre-Arc Time, Seconds
100
10-2
10-3
10-4
10-5
4.0A
5.0A
FUSE TIME - CURRENT CHARACTERISTICS FOR TYPE
F0612D (TYPICAL)**Not recommended for new designs,
please contact factory
/A\V/)I(e A wocm emu; chPAM /;.\V/)I(_ |
21
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
SMD Thin-Film Fuse
011419
10-1
1
10
100
1000
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
11
010-6 10-5 10-4 10-3 10-2 10-1
5.00A
4.00A
FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME
FOR TYPE F0612D (TYPICAL)**Not recommended for new designs,
please contact factory
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
22 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® II
SMD Thin-Film Fuse
011419
10-1
1
10
100
1000
Pre-Arc i2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
50403020100 60
5.00A
4.00A
FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT FOR
TYPE F0612D (TYPICAL) *Not recommended for new designs,
please contact factory
”M A mm»: snow c
23
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® Type 1206A*
SMD Thin-Film Fuse
010319
ELECTRICAL SPECIFICATIONS
Operating Temperature: -55°C to +125°C
Current carrying capacity at -55°C is 107% of rating;
at +25°C 100% of rating; at +85°C 93% of rating;
at +125°C 90% of rating.
Rated Voltage: 32V
Interupting Rating: 50A
Insulation Resistance: >20MΩ guaranteed (after fusing at rated voltage)
Part Number
Current
Rating
A
Resistance
@ 10% x I rated,
25°C Ω (Max.)
Voltage Drop
@ 1 x I rated, 25°C
mV (Max.)
Fusing Current
(within 5 sec.) 25°C
A
Pre-Arc
I2 t @ 50A
A2 - sec.
F1206A0R20FWTR 0.200 0.95 350 0.40 0.00002*
F1206A0R25FWTR 0.250 0.75 280 0.50 0.00004*
F1206A0R37FWTR 0.375 0.40 220 0.75 0.00006
F1206A0R50FWTR 0.500 0.35 220 1.00 0.0002
F1206A0R75FWTR 0.750 0.25 220 1.50 0.003
F1206A1R00FWTR 1.000 0.18 220 2.00 0.005
F1206A1R25FWTR 1.250 0.15 220 2.50 0.009
F1206A1R50FWTR 1.500 0.11 220 3.00 0.02
F1206A1R75FWTR 1.750 0.10 210 3.50 0.035
F1206A2R00FWTR 2.000 0.065 160 4.00 0.04
* Current is limited to less than 50A at 32V due to internal fuse resistance
ENVIRONMENTAL CHARACTERISTICS
Test Conditions Requirement
Solderability Components completely immersed in
a solder bath at 235 ±5°C for 2 secs.
Terminations to be well
tinned No visible damage
Leach Resistance Completely immersed in a solder bath
at 260 ±5°C for 60 secs.
Dissolution of termination
25% of area
∆R/R<10%
Storage 12 months minimum with components
stored in “as received” packaging. Good solderability
Shear
Components mounted to a substrate.
A force of 5N applied normal to the line
joining the terminations and in a line
parallel to the substrate.
No visible damage
Rapid Change of
Temperature
Components mounted to a substrate.
5 cycles -55°C to +125°C.
No visible damage
∆ R/R<10%
Vibration
Per Mil-Std-202F
Method 201A and
Method 204D Condition D.
No visible damage
∆R/R<10%
Load Life 25°C, I rated, 20,000 hrs. No visible damage
∆R/R<10%
*Not recommended for new designs,
please contact factory
/..\V/X( A wocm emu; commw /;.\V/)I(_ |
24 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® 1206A*
SMD Thin-Film Fuse
090518
0.20A
0.25A
0.375A
0.50A
0.75A
1.00A
1.25A
1.50A
1.75A
2.00A
10
-1
1
10
0.1 110
Current, Amp
Pre-Arc Time, Seconds
100
10
-2
10
-3
10
-4
10
-5
10
-6
FUSE TIME - CURRENT CHARACTERISTICS FOR SIZE
1206 (TYPICAL) *Not recommended for new designs,
please contact factory
/.‘.\V/)Xe A wocm emu; comm /;.\V/)I(_ |
25
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® 1206A*
SMD Thin-Film Fuse
090518
10-1
1
10
100
Pre-Arc I2t, A2sec
Current, Amp
10-2
10-3
10-4
10-5
5040
3020100 60
2.00A
1.75A
1.50A
1.25A
1.00A
0.75A
0.50A
0.25A
0.375A
0.20A
FUSE PRE-ARC JOULE INTEGRALS VS. CURRENT FOR
SIZE 1206 (TYPICAL) *Not recommended for new designs,
please contact factory
/A\V/)I(e A wocm emu; commv /;.\V/)I(_ |
26 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard® 1206A*
SMD Thin-Film Fuse
090518
10-1
1
10
100
Pre-Arc I2t, A2sec
Pre-Arc Time, Seconds
10-2
10-3
10-4
10-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
11
0
2.00A
1.75A
1.50A
1.25A
1.00A
0.75A
0.50A
0.375A
0.25A
0.20A
FUSE PRE-ARC JOULE INTEGRALS VS. PRE-ARC TIME
FOR SIZE 1206 (TYPICAL) *Not recommended for new designs,
please contact factory
AAAAAAAAAAAAAAAAAAAAA UK KE WE #7 LI ff E W % ‘~ L, 1 T L CE LE L: x { LE jjm i fig ‘* ’ /;.\V/)I(_ |
27
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
SMD Thin-Film Fuse Handling and Soldering
010319
QUALITY & RELIABILITY
Accu-Guard® series of fuses is based on established thin-film technology and
materials used in the semiconductor industry.
In-line Process Control: This program forms an integral part of the
production cycle and acts as a feedback system to regulate and control
production processes. The test procedures, which are integrated into the
production process, were developed after long research and are based on the
highly developed semiconductor industry test procedures and equipment.
These measures help AVX/Kyocera to produce a consistent and high yield
line of products.
Final Quality Inspection: Finished parts are tested for standard elecrical
parameters and visual/mechanical characteristics. Each production lot is
100% evaluated for electrical resistance. In addition, each production lot is
evaluated on sample basis for:
• Insulation resistance (post fusing)
• Blow time for two times rated current
• Endurance Test: 125°C, rated current, 4 hours
HANDLING AND SOLDERING
SMD chips should be handled with care to avoid damage or contamination
from perspiration and skin oils. The use of plastic tipped tweezers or
vacuum pick-ups is strongly recommended for individual components. Bulk
handling should ensure that abrasion and mechanical shock are minimized.
For automatic equipment, taped and reeled product is the ideal medium for
direct presentation to the placement machine.
CIRCUIT BROAD TYPE
All flexible types of circuit boards may be used
(e.g. FR-4, G-10).
For other circuit board materials, please consult factory.
WAVE SOLDERING DIMENSIONS
COMPONENT PAD DESIGN
Component pads must be designed to achieve good joints and minimize
component movement during soldering. Pad designs are given below for
both wave and reflow soldering.
The basis of these designs are:
a. Pad width equal to component width. It is permissible to
decrease this to as low as 85% of component width but it
is not advisable to go below this
b. Pad overlap 0.5mm.
c. Pad extension 0.5mm for reflow. Pad extension about
1.0mm for wave soldering.
PREHEAT & SOLDERING
The rate of preheat in production should not exceed 4°C/second. It is
recommended not to exceed 2°C/second Temperature differential from
preheat to soldering should not exceed 150°C. For further specific application
or process advice, please consult AVX.
HAND SOLDERING & REWORK
Hand soldering is permissible. Preheat of the PCB to 100°C is required. The
most preferable technique is to use hot air soldering tools. Where a soldering
iron is used, a temperature controlled model not exceeding 30 watts
should be used and set to not more than 260°C. Maximum allowed time at
temperature is 1 minute.
COOLING
After soldering, the assembly should preferably be allowed to cool naturally.
In the event of assisted cooling, similar conditions to those recommended
for preheating should be used.
REFLOW SOLDERING DIMENSIONS
0805
0805
0603
0603
0402
0402
1206
1206
0612
0612
0.6
(0.024)
0.6
(0.024)
0.5
(0.020)
1.7
(0.068)
0.59
(0.023)
0.8
(0.031)
0.8
(0.031)
0.5
(0.020)
2.1
(0.083)
0.59
(0.023)
1.25
(0.049)
0.6 (0.024)
1.25
(0.049)
3.1
(0.122)
3.1
(0.122)
1.25
(0.049)
0.6 (0.024)
1.25
(0.049)
3.1
(0.122)
3.1
(0.122)
3.1
(0.122)
0.8
(0.031)
0.6
(0.024)
1.25
(0.049)
1.25
(0.049)
1.5
(0.059)
1.5
(0.059)
2.0
(0.079)
5.0
(0.197)
1.6
(0.063)
1.5
(0.059)
1.5
(0.059)
1.0
(0.039)
4.0
(0.157)
1.25
(0.049)
0.8
(0.031)
2.3
(0.091)
0.6
(0.024)
0.85
(0.033)
0.85
(0.033)
3.0
(0.118)
1.25
(0.049)
1.0
(0.039)
1.0
(0.039)
1.0
(0.039)
1.0
(0.039)
1.0
(0.039)
2.0
(0.079)
4.0
(0.157)
1.6
(0.063)
millimeters (inches)
millimeters (inches)
/..\V/)I(” A man snow cowmv lamp ('5! nun ma 12.; 21:1 25: «:15 aw 5m 5-. ”a I'm /;.\V/)I(‘ |
28 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
SMD Thin-Film Fuse Handling and Soldering
010319
Cleaning liquids...........
Ultrasonic conditions...
Temperature................
i-propanol, ethanol, acetylacetone, water, and other
standard PCB cleaning liquids.
power - 20w/liter max.
frequency - 20kHz to 45kHz
80°C maximum (if not otherwise limited by
chosen solvent system).
TIME......................................5 minutes max.
RECOMMENDED SOLDERING PROFILES
CLEANING RECOMMENDATIONS
Care should be taken to ensure that the devices are thoroughly cleaned of
flux residues, especially the space beneath the device. Such residues may
otherwise become conductive and effectively offer a lousy bypass to the
device. Verious recommended cleaning conditions (which must be optimized
for the flux system being used) are as follows:
STORAGE CONDITIONS
Recommended storage conditions for Accu-Guard® prior to use are
as follows:
Temperature: 15°C to 35°C
Humidity: <65%
Air Pressure: 860mbar to1060mbar
RECOMMENDED REFLOW
SOLDERING PROFILE
COMPONENTS WITH
SNPB TERMINATIONS
RECOMMENDED REFLOW
SOLDERING PROFILE
LEAD FREE COMPONENTS WITH
SN100 TERMINATIONS
/.‘.\V/)I(” A man snow cowmv >\ ‘4» DRIVE SPOKES OPTIO ‘H H— IF USED, ASTERISKE DIMENSIONS APPLY m '10 PITCHES “ li‘ CENTER LINE OF CAVITY
29
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
SMD Thin-Film Fuse Handling and Soldering
090518
FULL RADIUS
D*
B* C
E
F
G MAX.
A
DRIVE SPOKES OPTIONAL
IF USED, ASTERISKED
DIMENSIONS APPLY.
*
A
E
P
D
F
W
L
C
B
10 PITCHES
CUMULATIVE
TOLERANCE ON
TAPE 0.2
CENTER LINE
S
OF CAVITY
TOP
TA
PE
DIRECTION OF FEED
REEL DIMENSIONS
A(1) B* C D* E F G
180 + 1.0
(7.087 + 0.039)
1.5 min.
(0.059 min.)
13 ± 0.2
(0.512 ± 0.008)
20.2 min.
(0.795 min.)
50 min.
(1.969 min.)
9.4 ± 1.5
(0.370 ± 0.050)
14.4 max.
(0.567 max.)
Metric dimensions will govern.
Inch measurements rounded for reference only.
(1) 330mm (13 inch) reels are available.
CARRIER DIMENSIONS
A B C D E F
8.0 ± 0.3
(0.315 ± 0.012)
3.5 ± 0.05
(0.138 ± 0.002)
1.75 ± 0.1
(0.069 ± 0.004)
2.0 ± 0.05
(0.079 ± 0.002)
4.0 ± 0.1
(0.157 ± 0.004)
Note: The nominal dimensions of the component compartment (W,L) are derived from the component size.
P = 4mm except 0402 where P = 2mm
PACKAGING
Automatic Insertion Packaging
Tape & Reel: All tape and reel specifications are in compliance with EIA 481-1
– 8mm carrier
– Reeled quantities: Reels of 3,000 or 10,000 pieces
(for F0402: 5,000 or 20,000 pieces)
millimeters (inches)
millimeters (inches)
”M A mm»: snow c
30 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
Fuse Selection Guide
010319
HOW TO CHOOSE THE CORRECT ACCU–GUARD FUSE
FOR CIRCUIT PROTECTION
Correct choice of an Accu-Guard® fuse for a given application is fairly
straightforward. The factor of pre-arc l2t, however, requires clarification. The
proper design for pre-arc l2t is presented by way of example
DESIGN PARAMETERS
1. Operating Temperature
The Accu-Guard® is specified for operation in the temperature range of -55°C
to +125°C. Note, however, that fusing current is sensitive to temperature this
means that the fuse must be derated or uprated at circuit temperatures other
than 25°C:
Environmental
Temperature
Accu-Guard®
Current Carrying Capacity*
F0402G
F0603G
F0402E,
F0603E
F0805B,
F1206A,
F1206B
F0805B
2.50A &
3.00A
F0603C F0612D
-55°C to -11°C 1.07 x IR1.07 x IR1.07 x IR1.07 x IR1.07 x IR
-1C to 60°C IRIRIRIRIR
61°C to 100°C 0.85 x IR0.93 x IR0.90 x IR0.90 x IR0.80 x IR
101°C to 125°C 0.80 x IR0.90 x IR0.90 x IR0.75 x IR0.75 x IR
*As a function of nominal rated current, lR.
2. Circuit Voltage Maximum Voltage:
Accu-Guard® is specified for circuits of up to rated voltage. Accu-Guard® will
successfully break currents at higher voltages as well, but over voltage may
crack the fuse body.
Minimum Voltage:
Accu-Guard® cannot be used in circuits with voltage of about 0.5V and
less. The internal resistance of the fuse will limit the fault current to a value
which will prevent reliable actuation of the fuse (<2 x rated current).
3. Maximum Fault Current
Accu-Guard® is fully tested and specified for fault currents up to 50A. Accu-
Guard® will successfully break currents above 50A, but such current may
crack the fuse body or damage the fuse terminations.
4. Steady-State Current
Accu-Guard® is specified to operate at least 4 hours at rated current without
fusing (25°C). Engineering tests have shown that F0805B and F1206A/B
Accu-Guard® will in fact operate at least 20,000 hours at rated current without
fusing (25°C).
5. Switch-on and Other Pulse Current
Many circuits generate a large current pulse when initially connected to
power. There are also circuits which are subject to momentary current pulses
due to external sources; telephone line cords which are subject to lightning-
induced pulses are one example. These current pulses must be passed by
the fuse without causing actuation. These pulses may be so large that they
are the determining factor for choosing the Accu-Guard® current rating; not
necessarily steady state current.
In order to design for current pulses, the concept of fuse pre-arc Joule integral,
I2t, must be understood. Fuse current rating is defined by the requirement
that 2 x Ir or 2.5 x Ir (depending on fuse type) will cause actuation in t<5
seconds. This rating does not indicate how the fuse will react to very high
currents of very short duration. Rather, the fusing characteristic at very high
currents is specified by I2t-t curves (or I2t-I).
I2t expresses the amount of energy required to actuate the fuse. Total I²t
expresses the total energy which will be passed by the fuse until total
cessation of current flow. Pre-arc I²t expresses that energy required to
cause large irreversible damage to the fuse element (Total I²t = pre-arc
I²t + arc I²t). If the Joule integral of the switch-on pulse is larger than the
fuse pre-arc I²t, nuisance actuation will occur.
In order to choose the proper Accu-Guard® current rating for a given
application, it is necessary to calculate the I²t Joule integral of the circuit
switch-on and other current pulses and compare them to the Accu-
Guard® I²t-t curves. An Accu-Guard® fuse must be chosen such that the
pulse I²t is no more than 50% of the pre-arc I²t of the prospective fuse.
Pre-arc I²t of the Accu-Guard® fuses is well characterized; I²t-t and I²t-I
graphs are in this catalog. The problem is calculating the I²t of the circuit
current pulses. This concept is not familiar to most engineers. Correct
calculation of pulse Joule integral and subsequent choice of Accu-
Guard® current rating is illustrated by way of the attached examples.
/.‘.\V/)Xe A wocm emu; commw ID sec/div *1 #7 PRE-AREWE TIME, sec /A\V/>:<_ |="" 2="" msec/niv="" »‘="" ‘47="" j="" j="" pre-areing="" t‘me,="" sec="">
31
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
Fuse Selection Guide
011419
DESIGNING FOR CURRENT PULSE SITUATIONS
1. Sine wave current pulse
The Joule integral for sine wave pulse is
[(Imax)2 x t] /2
2. Triangular current pulse
The Joule integral for triangular pulse is [(Imax)2 x t] /3,
see Fig. 2a.
Thus, for the current pulse in Figure 2b, the Joule integral is
[(1.5A2 x 3 x 10-3 sec]/3 = 2.25 x 10-3 A2sec
Fig. 2b. Triangular pulse, example #2.
Fig. 1b. Triangular pulse, example #1.
Thus, for the current pulse in FIgure 1b, the Joule integral is [(4.8A)2 x 7.7 x
10-6 sec]/2 = 8.9 x 10-5 A2 sec
The pulse duration is 7.7μsec. We must find a fuse that can absorb at
least 8.9 x 10-5 x 2 = 1.8 x 10-4 A2sec Joule integral within 7.7μsec without
actuation. According to the l2t graph on page 6, pre-arching Joule intergral is
2.3x10-4 A2sec for the 0.5A fuse, which is slightly more than needed. The next
lower rating (0.375A), has only 6x10-5 A2 sec, which is not enough. Therefore,
0.5A fuse should be chosen for this application, see Figure 1c.
The pulse duration is 3 msec. In the l2t graph on page 6, pre-arcing Joule
intergral for 3 msec pulse is 4 x 10-3A2sec for the 0.5A fuse (not enough) and
2 x 10-2 for the 0.75A fuse (more than enough). Therefore, 0.75A fuse should
be chosen for this application, see Figure 2c.
Fig. 1a. Sine wave pulse paramerters for Joule integral
calculation, example #1.
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
see Fig. 1a.
Fig. 1c. Choice of 0.5A fuse, example #1.
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample current pulse
Fig. 2c. Choice of 0.75A fuse, example #2.
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample current pulse
t
l max.
t
l max.
10 sec/div
1A/div
2 msec/div
0.5A/div
0.5A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10-1
10-2
10-3
10-4
10-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
x
0.75A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10
-1
10
-2
10
-3
10
-4
10
-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
x
Fig. 2a. Triangular pulse parameters for joule
integral calculation, example #2.
/.‘.\V/)Xe A wocm emu; commw ‘ ‘ 0.5 msec/uiv»‘ ‘e Insec/uwa‘ '« A A 7 j PRE-AREWG nME, sec PRE-AREWG nME, sec /;.\V/)I(_ |
32 The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
Fuse Selection Guide
011419
DESIGNING FOR CURRENT PULSE SITUATIONS (CONT.)
3. Trapezoidal current pulse
The Joule integral for a trapezoidal pulse is
[(I2
max+I2
min+Imax * Imin) / 3] x t
4. Lightning strike
A Lightning strike pulse is shown in Figure 4a. After an initial linear rise, the
current declines exponentially
Joule integral for the linear current rise is calculated as for a triangular pulse,
see example #2
The Joule integral for the exponential decline is
lmax
2 x t0.5 x (-1/2ln 0.5) = 0.72(lmax)2 x t0.5
Thus, for the sample lightning strike pulse in Figure 4b, the
total Joule integral is:
(25A)2 x 2 x 10-6sec/3+0.72 x (25A)2 x 10 x 10-6sec = 4.92 x 10-3A2sec
Thus, for current pulse in Figure 3b, the Joule integral is:
{[(0.56A)2+ (1A)2 +0.56A x 13A] / 3 } x 3 x 10-3s = 1.9 x 10-3A2sec
Fig. 3a. Trapezoidal pulse paramerters for Joule
integral calculation, example #3
Fig. 4a. Lightning pulse parameters for Joule
integral calculation, example #4
Fig. 3b. Trapezoidal pulse, example #3 Fig. 4b. Lightning strike pulse, example #4.
According to the l2t graph on page 6, the 0.5A fuse should be
chosen for this application, see Figure 3c.
For practical calculations, the duration of exponential decline may
be assumed to be 3t0.5, because within this time 98.5% of the pulse
energy is released. Thus, the total pulse duration in this example is 30
μsec, and the 1.25A fuse should be chosen for this application, see
Figure 4c.
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
Fig. 3c. Choice of 0.75A fuse, example #3.
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample current pulse
Fig. 4c. Choice of 0.5A fuse, example #4.
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample current pulse
t
l min.
l max.
see Fig. 3a.
t0.5
0.51 max.
l max.
0.5 msec/div
0.5A/div
10 sec/div
5A/div
0.50A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10
-1
10
-2
10
-3
10
-4
10
-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
x
1.25A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10
-1
10
-2
10
-3
10
-4
10
-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
x
/.‘.\V/)Xe A wocm emu; comm ZOOsec/divfl '47 2msec/div—>| ‘<— a="" j="" \v/="">:<_ |="">
33
The Important Information/Disclaimer is incorporated in the catalog where these specifications came from or available
online at www.avx.com/disclaimer/ by reference and should be reviewed in full before placing any order.
Accu-Guard®
Fuse Selection Guide
090518
DESIGNING FOR CURRENT PULSE SITUATIONS (CONT.)
200 sec/div
2A/div
0.75A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10
-1
10
-2
10
-3
10
-4
10
-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
xx
2 msec/div
0.5A/div
0.75A
PRE-ARCING TIME l2t, A2 sec
PRE-ARCING TIME, sec
100
10
1
10
-1
10
-2
10
-3
10
-4
10
-5
10-7 10-6 10-5 10-4 10-3 10-2 10-1
110
x
5. Complex current pulse
If the pulse consists of several waveforms, all of them should be evaluated
seperately, and then the total Joule integral should be calculated as well.
In Figure 5a, the Joule integral for the first triangle is:
[(4.67A)2 x 294 x 10-6sec]/3=2.14 x 10-3 A2sec and 0.75A fuse should meet
this condition, see Figure 5b.
The Joule integral for the second triangle is
[(5.33A)2 x 269 x 10-6sec]/3 = 2.55 x 10-3 A2sec, and 0.75A fuse is suitable for
this case also, see Figure 5b.
However, for the whole pulse, the Joule integral is 4.7 x 10-3 A2sec, and the
total duration is 563 μsec. For the 0.75A fuse, the Joule integral is only 8.6
x 10-3 A2sec for this pulse duration, so 1A fuse should be chosen for this
application, see Figure 5b.
The steady-state current is 0.5A, and 1A fuse is typically recommended to
meet the steady-state condition. Based on steady-state current, the 1A fuse
should be chosen for this application.
6. Switch-on pulse and steady-state current
In Figure 6a, the switch-on pulse is a triangle pulse with a 5.1 x 10-3 A2sec
Joule integral of 5 msec duration; the 0.75A fuse will meet this requirement,
see Figure 6b.
Fig. 6a. Switch-on pulse and steady-state current,
example #6
Fig. 5a. Complex pulse, example #5
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
Fig. 6b. Choice of 0.75A fuse, example #6.
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample current pulse
Fig.5b. Choice of fuse, example #5
––––– Pre-arcing l2t
-------- Maximum l2t deisgn rule
x l2t for sample switch-on pulse
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