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Varistor
User Manual
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LITTELFUSE Varistor User Manual

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Varistor Products
Line V oltage Operation, Radial Lead
RoHS
The LA Series of transient voltage surge suppressors are radial-lead varistors (MOVs) that are designed to be operated continuously across AC power lines.These UL recognized varistors require very little mounting space, and are offered in various standard lead form options.
The LA Series varistors are available in four model sizes: 7mm, 10mm, 14mm and 20mm; and have a V
to 1000V, and an energy absorption capability up to 360J.Some LA series model numbers are available with clamping voltage selections, designated by a model number suffix of either A or B.The “A” selection is the standard model; the “B” selection provides a lower clamping voltage.
See LA Series Device Ratings and Specifications table for part number and brand information.
Pb
LA V aristor Series
M(AC)RMS
voltage range from 130V
Features
• Lead-free and RoHS compliant option available. Please see the device and ratings specifications table for more information.
• Energy Absorption Capability (WTM) ....................Up to 360J
• Wide Operating Voltage Range V
M(AC)RMS
• No Derating Up to 85
• Available in Tape and Reel or Bulk Pack
AGENCY APPROV ALS: Standard and Lead-free parts recognized under
the components program of Underwriters Laboratories.Certified by CSA, VDE and CECC.
.....................................130V to 1000V
o
C Ambient
NEW LEAD-FREE AND
RoHS COMPLIANT PARTS
AVAILABLE
AGENCY FILE NUMBERS: UL E75961, E56529 (Lead-free pending),
E135010 (Lead-free pending); CSA LR91788;VDE 116895E; CECC 42201-006.
ALSO SEE LITTELFUSE ULTRAMOV
™
AND C-III VARISTOR SERIES
56
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2
VARISTOR
PRODUCTS
Varistor Products
LA V aristor Series
Line Voltage Operation, Radial Lead
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 (V
M(AC)RMS
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 1000 V
DC Voltage Range (V
M(DC)
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175 to 1200 V
Transients:
Peak Pulse Current (ITM)
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200 to 6500 A
Single Pulse Energy Range
For 10/1000µs Current Wave (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 to 360 J
Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85
0
C
Storage Temperature Range (T
STG
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125
0
C
Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 %/0C
Hi-Pot Encapsulation (Isolation Voltage Capability) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2500 V
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301)
Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 MΩ
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 RT
NUMBER
MAXIMUM RATING (85
o
C) SPECIFICATIONS (25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
MAXIMUM
CLAMPING
VO LTAGE
8 x 20
s
TYPICAL CAPACI-
TANCE
f = 1MHzV
RMS
V
DC
ENERGY
10 x 1000 s
PEAK
CURRENT
8 x 20 s
V
M(AC)VM(DC)
W
TM
I
TM
V
NOM
MIN
V
NOM
MAX V
CIPK
C
(V) (V) (J) (A) (V) (V) (A) (pF)
V130LA1
1301
130 175 11 1200 184 255 390 10 180
V130LA2
1302
130 175 11 1200 184 228 340 10 180
V130LA5
1305
130 175 20 2500 184 228 340 25 450
V130LA10A
130L10
130 175 38 4500 184 228 340 50 1000
V130LA20A
130L20
130 175 70 6500 184 228 340 100 1900
V130LA20B
130L20B
130 175 70 6500 184 220 325 100 1900
V140LA2
1402
140 180 12 1200 198 242 360 10 160
V140LA5
1405
140 180 22 2500 198 242 360 25 400
V140LA10A
140L10
140 180 42 4500 198 242 360 50 900
V140LA20A
140L20
140 180 75 6500 198 242 340 100 1750
V150LA1
1501
150 200 13 1200 212 284 430 10 150
V150LA2
1502
150 200 13 1200 212 268 395 10 150
V150LA5
1505
150 200 25 2500 212 268 395 25 360
V150LA10A
150L10
150 200 45 4500 212 268 395 50 800
V150LA20A
150L20
150 200 80 6500 212 268 395 100 1600
V150LA20B
150L20B
150 200 80 6500 212 243 360 100 1600
V175LA2
1752
175 225 15 1200 247 303 455 10 130
V175LA5
1755
175 225 30 2500 247 303 455 25 350
V175LA10A
175L10
175 225 55 4500 247 303 455 50 700
V175LA20A
175L20
175 225 90 6500 247 303 455 100 1400
V230LA4
2304
230 300 20 1200 324 396 595 10 100
V230LA10
230L
230 300 35 2500 324 396 595 25 250
V230LA20A
230L20
230 300 70 4500 324 396 595 50 550
V230LA40A
230L40
230 300 122 6500 324 396 595 100 1100
PA RT
NUMBER
MODEL
SIZE DISC
DIA.
(mm)
V130LA1P 7P1301
V130LA2P 7P1302
V130LA5P 10P1305
V130LA10AP 14P130L10
V130LA20AP 20P130L20
V130LA20BP 20P130L20B
V140LA2P 7P1402
V140LA5P 10P1405
V140LA10AP 14P140L10
V140LA20AP 20P140L20
V150LA1P 7P1501
V150LA2P 7P1502
V150LA5P 10P1505
V150LA10AP 14P150L10
V150LA20AP 20P150L20
V150LA20BP 20P150L20B
V175LA2P 7P1752
V175LA5P 10P1755
V175LA10AP 14P175L10
V175LA20AP 20P175L20
V230LA4P 7P2304
V230LA10P 10P230L
V230LA20AP 14P230L20
V230LA40AP 20P230L40
LEAD-FREE
AND RoHS
COMPLIANT
MODELS
STANDARD
MODELS
Pb
RoHS
BRANDING
BRANDING
LA SERIES UNITS
Pb
RoHS
58
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Varistor Products
Line Voltage Operation, Radial Lead
LA V aristor Series
Device Ratings and Specifications (Continued)
V250LA2
7
2502 250 330 21 1200 354 473 730 10 90
V250LA4
7
2504 250 330 21 1200 354 429 650 10 90
V250LA10
10
250L 250 330 40 2500 354 429 650 25 220
V250LA20A14250L20 250 330 72 4500 354 429 650 50 500
V250LA40A20250L40 250 330 130 6500 354 429 650 100 1000
V250LA40B20250L40B 250 330 130 6500 354 413 620 100 1000
V275LA2
7
2752 275 369 23 1200 389 515 775 10 80
V275LA4
7
2754 275 369 23 1200 389 473 710 10 80
V275LA10
10
275L 275 369 45 2500 389 473 710 25 200
V275LA20A14275L20 275 369 75 4500 389 473 710 50 450
V275LA40A20275L40 275 369 140 6500 389 473 710 100 900
V275LA40B20275L40B 275 369 140 6500 389 453 680 100 900
V300LA2
7
3002 300 405 25 1200 420 565 870 10 70
V300LA4
7
3004 300 405 25 1200 420 517 775 10 70
V300LA10
10
300L 300 405 46 2500 420 517 775 25 180
V300LA20A14300L20 300 405 77 4500 420 517 775 50 400
V300LA40A20300L40 300 405 165 6500 420 517 775 100 800
V320LA7
7
3207 320 420 25 1200 462 565 850 10 65
V320LA10
10
320L 320 420 48 2500 462 565 850 25 170
V320LA20A14320L20 320 420 80 4500 462 565 850 50 380
V320LA40B20320L40 320 420 150 6500 462 540 810 100 750
V385LA7
7
3857 385 505 27 1200 558 682 1025 10 60
V385LA10
10
385L 385 505 51 2500 558 682 1025 25 160
V385LA20A14385L20 385 505 85 4500 558 682 1025 50 360
V385LA40B20385L40 385 505 160 6500 558 682 1025 100 700
V420LA7
7
4207 420 560 30 1200 610 748 1120 10 55
V420LA10
10
420L 420 560 55 2500 610 748 1120 25 140
V420LA20A14420L20 420 560 90 4500 610 748 1120 50 300
V420LA40B20420L40 420 560 160 6500 610 720 1060 100 600
V460LA7
7
4607 460 615 37 1200 702 858 1130 10 55
V480LA7
7
4807 480 640 35 1200 670 825 1240 10 50
V480LA10
10
480L 480 640 60 2500 670 825 1240 25 120
V480LA40A14480L40 480 640 105 4500 670 825 1240 50 270
V480LA80B
20
480L80 480 640 180 6500 670 790 1160 100 550
V510LA10
10
510L 510 675 63 2500 735 910 1350 25 100
V510LA40A14510L40 510 675 110 4500 735 910 1350 50 250
V510LA80B20510L80 510 675 190 6500 735 860 1280 100 500
V575LA10
10
575L 575 730 65 2500 805 1000 1500 25 90
V575LA40A14575L40 575 730 120 4500 805 1000 1500 50 220
V575LA80B20575L80 575 730 220 6500 805 960 1410 100 450
V625LA10
10
625L 625 825 67 2500 900 1100 1650 25 80
V625LA40A14625L40 625 825 125 4500 900 1100 1650 50 210
V625LA80B20625L80 625 825 230 6500 900 1100 1650 100 425
PA RT
NUMBER
MODEL
SIZE DISC
DIA.
(mm)
MAXIMUM RATING (85
o
C) SPECIFICATIONS (25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
MAXIMUM
CLAMPING
VOLTAGE
8 x 20µs
TYPICAL CAPACI-
TANCE
f = 1MHzV
RMS
V
DC
ENERGY
10 x 1000µs
PEAK
CURRENT
8 x 20µs
V
M(AC)VM(DC)
W
TM
I
TM
V
NOM
MIN
V
NOM
MAX VCI
PK
C
(V) (V) (J) (A) (V) (V) (A) (pF)
PA RT
NUMBER
LEAD-FREE
AND RoHS
COMPLIANT
MODELS
STANDARD
MODELS
Pb
RoHS
BRANDING
BRANDING
V250LA2P P2502
V250LA4P P2504
V250LA10P P250L
V250LA20AP P250L20
V250LA40AP P250L40
V250LA40BP P250L40B
V275LA2P P2752
V275LA4P P2754
V275LA10P P275L
V275LA20AP P275L20
V275LA40AP P275L40
V275LA40BP P275L40B
V300LA2P P3002
V300LA4P P3004
V300LA10P P300L
V300LA20AP P300L20
V300LA40AP P300L40
V320LA7P P3207
V320LA10P P320L
V320LA20AP P320L20
V320LA40BP P320L40
V385LA7P P3857
V385LA10P P385L
V385LA20AP P385L20
V385LA40BP P385L40
V420LA7P P4207
V420LA10P P420L
V420LA20AP P420L20
V420LA40BP P420L40
V460LA7P P4607
V480LA7P P4807
V480LA10P P480L
V480LA40AP P480L40
V480LA80BP P480L80
V510LA10P P510L
V510LA40AP P510L40
V510LA80BP P510L80
V575LA10P P575L
V575LA40AP P575L40
V575LA80BP P575L80
V625LA10P P625L
V625LA40AP P625L40
V625LA80BP P625L80
Pb
RoHS
59
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2
VARISTOR
PRODUCTS
Varistor Products
LA V aristor Series
Line Voltage Operation, Radial Lead
Device Ratings and Specifications (Continued)
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation is 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.The operating values of a MOV need to be derated at high temperatures as shown in Figure 1. Because varistors only dissipate a relatively small amount of average power they are not suitable for repetitive applications that involve substantial amounts of average power dissipation.
V660LA10 10660L 660 850 70 2500 940 1210 1820 25 70
V660LA50A 14660L50 660 850 140 4500 940 1210 1820 50 200
V660LA100B 20660L100 660 850 250 6500 940 1100 1650 100 400
V1000LA80A 141000L80 1000 1200 220 4500 1425 1800 2700 50 130
V1000LA160B 201000L160 1000 1200 360 6500 1425 1600 2420 100 250
NOTE: Avera
g
e power dissipation of transients not to exceed 0.25W, 0.4W, 0.6W or 1W for model sizes 7mm, 10mm, 14mm and 20mm, respectively.
PA RT
NUMBER
MODEL
SIZE DISC
DIA.
(mm)
MAXIMUM RATING (85
o
C) SPECIFICATIONS (25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLT-
AGE AT 1mA DC
TEST CURRENT
MAXIMUM
CLAMPING
VOLTAGE
8 x 20µs
TYPICAL CAPACI-
TANCE
f = 1MHzV
RMS
V
DC
ENERGY
10 x 1000µs
PEAK
CURRENT
8 x 20µs
V
M(AC)VM(DC)
W
TM
I
TM
V
NOM
MIN
V
NOM
MAX V
CIPK
C
(V) (V) (J) (A) (V) (V) (A) (pF)
V660LA10P P660L
V660LA50AP P660L50
V660LA100BP P660L100
V1000LA80AP P1000L8
V1000LA160BP P1000L16
PA RT
NUMBER
LEAD-FREE
AND RoHS
COMPLIANT
MODELS
STANDARD
MODELS
Pb
RoHS
BRANDING
BRANDING
100
90 80 70 60 50 40 30 20 10
0
-55 50 60 70 80 90 100 110 120 130 140 150 AMBIENT TEMPERATURE (
o
C)
PERCENT OF RATED VALUE
FIGURE 1. CURRENT, ENERGY AND PO WER DERATING
CURVE
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O
1
T
T
1
T
2
TIME
PERCENT OF PEAK VALUE
O1 = Virtual Origin of Wave
T = Time From 10% to 90% of Peak
T
1
= Virtual Front time = 1.25 • t
T
2
= Virtual Time to Half Value (Impulse Duration)
Example: For an 8/20µs Current Waveform:
8µs = T
1
= Virtual Front Time
20µs = T
2
= Virtual Time to Half Value
Pb
RoHS
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