PA Varistor Series Datasheet by Littelfuse Inc.

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Base Mount
PA Varistor Series
The PA Series of transient surge suppressors are metal-oxide varistors
(MOVs) featuring a rigid base mount package construction, and are
useful in applications which are subject to vibration.
These UL and CSA recognized varistors are available in a wide range of
operating voltages, from 130V to 660V VM(AC)RMS . The base-mount
package has a quick-connect tab terminal that provides a fast, secure
lead attach. The mounting base forms the second electrical connection,
usually chassis ground. Meeting rigid NEMA standards, PA series
varistors have a creep and strike distance capability that minimizes
breakdown along the package surface.
See PA Series Device Ratings and Specifications table for part number
and brand information.
Features
• Wide Operating Voltage Range
VM(AC)RMS ...................................130V to 660V
• Creep and Strike Distance Capability Meets Rigid NEMA Standards
• Base Mount Construction Forms One Electrical Connection
• Quick Connect Tab Terminal
• No Derating Up to 85oC Ambient
AGENCY APPROVALS: Recognized under the components program of
Underwriters Laboratories. Certified by CSA.
AGENCY FILE NUMBERS: UL E75961, CSA LR91788.
®
®
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VARISTOR
PRODUCTS
Base Mount
PA Varistor Series
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous:
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 660 V
DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 to 850 V
Transient:
Peak Pulse Current (ITM)
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6500 A
Single Pulse Energy Range
For 10/1000µs Current Wave (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 to 250 J
Operating Ambient Temperature Range (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 OC
Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 OC
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 %/OC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Device Ratings and Specifications
PA SERIES UNITS
PART NUMBER
AND DEVICE
BRANDING
MAXIMUM RATINGS (85oC) SPECIFICATIONS (25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLTAGE
AT 1mA DC
TEST CURRENT
MAX CLAMPING
VOLT VC AT TEST
CURRENT (8/20µs)
TYPICAL
CAPACI-
TANCEVRMS VDC
ENERGY
(10/1000µs)
PEAK
CURRENT
(8/20µs)
VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VCIPf = 1MHz
(V) (V) (J) (A) (V) (V) (V) (V) (A) (pF)
V130PA20A 130 175 70 6500 184 200 243 360 100 1900
V130PA20C 130 175 70 6500 184 200 220 325 100 1900
V150PA20A 150 200 80 6500 212 240 284 420 100 1600
V150PA20C 150 200 80 6500 212 240 243 360 100 1600
V250PA40A 250 330 130 6500 354 390 453 675 100 1000
V250PA40C 250 330 130 6500 354 390 413 620 100 1000
V275PA40A 275 369 140 6500 389 430 494 740 100 900
V275PA40C 275 369 140 6500 389 430 453 680 100 900
V320PA40A 320 420 160 6500 462 510 565 850 100 750
V320PA40C 320
350
350
420
460
460
160
165
165
6500
6500
6500
462
500
500
510
559
535
540
618
570
800
910
840
100
100
100
750
700
700
V420PA40A 420 560 170 6500 610 680 790 1160 100 600
V420PA40C 420 560 170 6500 610 680 690 1050 100 600
V480PA80A 480 640 180 6500 670 750 860 1280 100 550
V480PA80C 480 640 180 6500 670 750 790 1160 100 550
V510PA80A 510 675 190 6500 735 820 963 1410 100 500
V510PA80C 510 675 190 6500 735 820 860 1280 100 500
V575PA80A 575 730 220 6500 805 910 1050 1560 100 450
V575PA80C 575 730 220 6500 805 910 960 1410 100 450
V660PA100A 660 850 250 6500 940 1050 1210 1820 100 400
V350PA40A
V350PA40C
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PA Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation
required is simply the energy (watt-seconds) per pulse times the number
of pulses per second. The power so developed must be within the
specifications shown on the Device Ratings and Specifications table for
the specific device. Furthermore, the operating values need to be derated
at high temperatures as shown in Figure 1. Because varistors can only
dissipate a relatively small amount of average power they are, therefore,
not suitable for repetitive applications that involve substantial amounts of
average power dissipation.
Transient V-I Characteristics Curves
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
100
90
80
70
60
50
40
30
20
10
0-55 50 60 70 80 90 100 110 120 130 140 150
PERCENT OF RATED VALUE
AMBIENT TEMPERATURE ( oC)
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O1T
T1T2
TIME
PERCENT OF PEAK VALUE
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T1 = Virtual Front time = 1.25 t
T2 = Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T1 = Virtual Front Time
20µs = T2 = Virtual Time to Half Value
FIGURE 3. CLAMPING VOLTAGE FOR V130PA20A -
V660PA100A
200
6,000
5,000
4,000
3,000
1,000
900
800
700
600
500
400
300
10-3 10-2 10-1 100101102104
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES (A)
2,000
103
MAXIMUM CLAMPING VOLTAGE
“A” SUFFIX
130 TO 660VM(AC) RATING
TA = -55oC TO 85oC
V320PA40A
A40A
V660PA80A
V575PA80A
V510PA80A
V480PA80A
V420PA80A
V275PA40A
V250PA40A
V150PA20A
V130PA20A
FIGURE 4. CLAMPING VOLTAGE FOR V130PA20C -
V660PA100C
200
6,000
5,000
4,000
3,000
1,000
900
800
700
600
500
400
300
10-3 10-2 10-1 100101102104
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES (A)
2,000
103
MAXIMUM CLAMPING VOLTAGE
“C” SUFFIX
130 TO 660VM(AC) RATING
TA = -55oC TO 85oC
V150PA20C
V130PA20C
V660PA100C
V575PA80C
V510PA80C
V480PA80C
V420PA80C
V275PA40C
V250PA40C
V320PA40C
V350PA40C
Base Mount
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VARISTOR
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Base Mount
PA Varistor Series
Pulse Rating Curves
Mechanical Dimensions
FIGURE 5. SURGE CURRENT RATING CURVES FOR
V130PA20A - V320PA40C FIGURE 6. SURGE CURRENT RATING CURVES FOR
V420PA40A - V660PA100C
10,000
2,000
200
100
50
20
10
5
2
500
20 100 1,000 10,000
IMPULSE DURATION (µs)
SURGE CURRENT (A)
12
104
105
106
DISC SIZE 20mm
V130PA20A - V320PA40C
103
INDEFINITE
1,000
102
10
5,000
1
10,000
2,000
200
100
50
20
10
5
2
500
20 100 1,000 10,000
IMPULSE DURATION (µs)
SURGE CURRENT (A)
12
104
105
106
DISC SIZE 20mm
V420PA40A - V660PA100C
103
INDEFINITE
1,000
102
10
5,000
1
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than ±10% could result.This type of shift, which normally results in a decrease of VN(DC),
may result in the device not meeting the original published specifications, but it does not prevent the device from continuing to function, and to provide transient protection
NOTES:
1. Tab is designed to fit 1/4” quick-connect terminal.
2. Case temperature is measured at TC on top surface of base
plate.
3. H1 (130-150VRMS devices).
H2 (250-320VRMS devices).
H3 (420-660VRMS devices).
4. Electrical connection: top terminal and base plate.
5. Typical weight: 30g.
D
Q
S
FC
B
ØP
2 HOLES ØD1
T
TC
H1, 2, 3
Jh
E
b
b3
ØTTA B
b2
A
SEATING
PLANE
SYM-
BOL
MILLIMETERS INCHES
NOTESMIN NOM MAX MIN NOM MAX
A - - 14.3 - - 0.570 -
b - - 6.6 - - 0.260 1
b2 3.94 4.06 4.18 0.155 0.160 0.165 -
b3 3.05 3.17 3.29 0.120 0.125 0.130 -
B - - 12.9 - - 0.510 -
C - - 6.6 - - 0.260 -
D - - 66.3 - - 2.610 -
ØD1 - - 33.5 - - 1.320 -
E - 11.2 - - 0.440 - -
F 7.50 7.62 7.75 0.295 0.300 0.305 -
h - 0.8 1.0 - 0.030 0.040 -
H1- - 25.6 - - 1.010 3
H2- - 28.3 - - 1.120 3
H3- - 32.8 - - 1.290 3
J - - 8.1 - - 0.320 -
ØP 5.6 - 6.0 0.220 - 0.240 -
Q 50.6 50.8 51.0 1.990 2.000 2.010 -
S 18.4 19.2 20.0 0.72 0.75 0.78 -
T - - 1.0 - - 0.040 -
ØT 2.8 - - 0.110 - - -
TC- 3.2 - - 0.126 - 2
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Suggested Hardware and Mounting Arrangements
TYPICAL NON-ISOLATED MOUNTING TYPICAL ISOLATED MOUNTING
THERMAL
GREASE
LAYER
#10-32 PAN HEAD
SCREW
#10 FLAT WASHER
VARISTOR
MOUNTING
LOCK WASHER
#10-32 NUT
SURFACE THERMAL
GREASE
LAYER
#6 FLAT WASHER
PHENOLIC SHOULDER
SPACER
VARISTOR
MOUNTING
LOCK WASHER
#6-32 NUT
SURFACE
THERMAL
QUICK
CONNECT
MICA INSULATOR
WASHER
#6-32 SCREW
(NOTE 6)
NOTE:
6. GE G623, Dow Corning, DC3, 4, 340, or 640 Thermal Grease recommended for best heat transfer.
1,000V Isolation Kit containing the following parts can be ordered by part #A7811055 (Qty).
Ordering Information
(1) MICA insulation 1”/3.1”/0.005” thick
(1) 1/4 ” quick-connect terminal
(2) Phenolic shoulder washer
(1) Spacer
(2) #6-32/3 / 4 screw
(2) #6-32 nut
(2) #6 internal tooth lock washer
(2) #6 flat washer
VARISTOR
VM(AC)
130V to 660V
CLAMPING VOLTAGE
SELECTION DESIGNATOR
A = Standard
C = Low Clamp Voltage Option
SERIES DESIGNATOR
V XXX PA XX X
RELATIVE ENERGY INDICATOR
Base Mount

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