48 www.littelfuse.com
Varistor Products
The C-III Series of metal-oxide var istors are specifically designed for
applications requiring high surge energy absor ption ratings and superior
multiple pulse absorbtion rating.This is achieved through a special
dielectric material formulation which also results in higher repetitive
surge ratings than other MOV types.
The C-III series is primar ily intended for use in AC line Transient Voltage
Surge Suppressor (TVSS) product environment and other similar appli-
cations requiring high transient energy and peak current capability in a
relatively small package size.
The C-III series is supplied in 10mm, 14mm and 20mm disc versions
with various lead options.
These types are shipped in bulk or Tape and Reel packaging. Part
number and brand infor mation is provided in the Ratings table.
Features
• Lead-free and RoHS compliant option available. Please see the
device and ratings specifications table for more infor mation.
• High Energy Absorption Capability
WTM .....................................40J to 530J (2ms)
• High Pulse Life Rating
• High Peak Pulse Current Capability
ITM .................................3500A to 9000A (8/20µs)
• Wide Operating Voltage Range
VM(AC)RMS ..................................130V to 660V
• Available in Tape and Reel for Automatic Insertion; Also Available with
Crimped and/or Trimmed Lead Styles
• No Derating Up to 85oC Ambient
AGENCY APPROVALS: Recognized under the components program of
Underwriters Laboratories. Certified by CSA, VDE and CECC. VDE certifica-
tion of Lead-free and RoHS compliant parts pending.
AGENCY FILE NUMBERS: UL E75961, CSA LR91788,
VDE 116895E, CECC 42201-006.
ALSO SEE LITTELFUSE
ULTRAMOV™VARISTOR SERIES
®
®
V
DE
High Energy, High Multiple Pulse Capability Radial Lead
C-III V aristor Series
Pb
RoHS
NEW LEAD-FREE AND
RoHS COMPLIANT PARTS
AVAILABLE
49
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2
VARISTOR
PRODUCTS
Varistor Products
High Energy Radial Lead
C-III V aristor Series
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous:
Steady State AC Voltage Range (VM(AC)RMS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 660 V
Transients:
Single-Pulse Peak Current (ITM) 8/20µs Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3500 to 9000 A
Single-Pulse Energy Range (WTM) 2ms Rectangular Wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 to 530 J
Maximum Temporary Over voltage of VM(AC):
5 Minutes Duration @ 25oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 %
5 Minutes Duration @ 125oC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 %
Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 oC
Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to125 oC
Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.0 %/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 thedevice
at these or any other conditions above those indicated in the operational sections of this specification is not implied.
C-III Series Ratings
C-III SERIES UNITS
PART
NUMBER BRANDING
MAXIMUM RA TINGS (85
o
C)
CONTINUOUS TRANSIENT
MAXIMUM V
RMS
V
M(AC)
(V)
WITHSTANDING
ENERGY (2ms)
W
TM
()
(J)
PEAK CURRENT (8/20µs)
I
TM1
1 PULSE
(A) I
TM2
2 PULSES
(A)
V130LA10C
V130LA20C
V130LA20CX325
130L10C
130L20C
130CX325
130
130
130
80
200
200
6000
9000
9000
5000
V130LA5C 130L5C 130 40 3500 3000
7000
7000
V140LA10C
V140LA20C
V140LA20CX340
140L10C
140L20C
140CX340
140
140
140
90
210
210
6000
9000
9000
5000
V140LA5C 140L5C 140 45 3500 3000
7000
7000
V150LA10C
V150LA20C
V150LA20CX360
150L10C
150L20C
150CX360
150
150
150
100
215
215
6000
9000
9000
5000
V150LA5C 150L5C 150 50 3500 3000
7000
7000
V175LA10C
V175LA20C
V175LA20CX425
175L10C
175L20C
175CX425
175
175
175
110
220
220
6000
9000
9000
5000
V175LA5C 175L5C 175 55 3500 3000
7000
7000
V230LA20C
V230LA40C
V230LA40CX570
230L20C
230L40C
230X570
230
230
230
125
280
280
6000
9000
9000
5000
V230LA10C 230L10C 230 60 3500 3000
7000
7000
V250LA20C
V250LA40C
V250LA40CX620
250L20C
250L40C
250CX620
250
250
250
135
300
300
6000
9000
9000
5000
V250LA10C 250L10C 250 65 3500 3000
7000
7000
V275LA20C
V275LA40C
V275LA40CX680
275L20C
275L40C
275CX680
275
275
275
145
320
320
6000
9000
9000
5000
V275LA10C 275L10C 275 70 3500 3000
7000
7000
V300LA20C
V300LA40C
V300LA40CX745
300L20C
300L40C
300CX745
300
300
300
155
335
335
6000
9000
9000
5000
V300LA10C 300L10C 300 75 3500 3000
7000
7000
V320LA20C
V320LA40C 320L20C
320L40C 320
320 165
345 6000
9000 5000
V320LA10C 320L10C 320 80 3500 3000
7000
V385LA20C
V385LA40C 385L20C
385L40C 385
385 175
370 6000
9000 5000
7000
V420LA20C
V420LA40C 420L20C
420L40C 420
420 185
390 6000
9000 5000
7000
V460LA40C 460L40C 460 430 9000 7000
V480LA80C 480L80C 480 420 9000 7000
V510LA80C 510L80C 510 440 9000 7000
V550LA80C 550L80C 550 450 9000 7000
V575LA80C 575L80C 575 460 9000 7000
V625LA80C 625L80C 625 490 9000 7000
V660LA80C 660L80C 660 510 9000 7000
V320LA40CX810 320CX810 320 345 9000 7000
PART
NUMBER BRANDING
V130LA10CP
V130LA20CP
V130LA20CX325P
P130L10C
P130L20C
P130CX325
V130LA5CP P130L5C
V140LA10CP
V140LA20CP
V140LA20CX340P
P140L10C
P140L20C
P140CX340
V140LA5CP P140L5C
V150LA10CP
V150LA20CP
V150LA20CX360P
P150L10C
P150L20C
P150CX360
V150LA5CP P150L5C
V175LA10CP
V175LA20CP
V175LA20CX425P
P175L10C
P175L20C
P175CX425
V175LA5CP P175L5C
V230LA20CP
V230LA40CP
V230LA40CX570P
P230L20C
P230L40C
P230X570
V230LA10CP P230L10C
V250LA20CP
V250LA40CP
V250LA40CX620P
P250L20C
P250L40C
P250CX620
V250LA10CP P250L10C
V275LA20CP
V275LA40CP
V275LA40CX680P
P275L20C
P275L40C
P275CX680
V275LA10CP P275L10C
V300LA20CP
V300LA40CP
V300LA40CX745P
P300L20C
P300L40C
P300CX745
V300LA10CP P300L10C
V320LA20CP
V320LA40CP P320L20C
P320L40C
V320LA10CP P320L10C
V385LA20CP
V385LA40CP P385L20C
P385L40C
V420LA20CP
V420LA40CP P420L20C
P420L40C
V460LA40CP P460L40C
V480LA80CP P480L80C
V510LA80CP P510L80C
V550LA80CP P550L80C
V575LA80CP P575L80C
V625LA80CP P625L80C
V660LA80CP P660L80C
V320LA40CX810P P320CX810
Pb
RoHS
LEAD-FREE
AND RoHS
COMPLIANT
MODELS STANDARD
MODELS
Pb
RoHS
50 www.littelfuse.com
High Energy Radial Lead
C-III V aristor Series
PART
NUMBER
MODEL SIZE
DISC
DIAMETER (mm)
SPECIFICATIONS (25
o
C)
VARISTOR VOLTAGE AT 1mA
DC TEST CURRENT
MAXIMUM CLAMPING
VOLTAGE
(8/20 s)
DUTY CYCLE
SURGE RATING
V
N
MIN
(V)
V
N
MAX
(V)
V
C
(V)
I
p
(A)
3kA
(8/20µs)
# PULSES
750A
(8/20µs)
# PULSES
V130LA10C
V130LA20C
V130LA20CX325
14
20
20
184
184
184
228
228
220
340
340
325
50
100
100
40
80
80
600
V130LA5C 10 184 228 340 25 2 100
1600
1600
V140LA10C
V140LA20C
V140LA20CX340
14
20
20
198
198
198
242
242
230
360
360
340
50
100
100
40
80
80
600
V140LA5C 10 198 242 360 25 2 100
1600
1600
V150LA10C
V150LA20C
V150LA20CX360
14
20
20
212
212
212
268
268
243
395
395
360
50
100
100
40
80
80
600
V150LA5C 10 212 268 395 25 2 100
1600
1600
V175LA10C
V175LA20C
V175LA20CX425
14
20
20
247
247
247
303
303
285
455
455
425
50
100
100
40
80
80
600
V175LA5C 10 247 303 455 25 2 100
1600
1600
V230LA20C
V230LA40C
V230LA40CX570
14
20
20
324
324
324
396
396
384
595
595
570
50
100
100
40
80
80
600
V230LA10C 10 324 396 595 25 2 100
1600
1600
V250LA20C
V250LA40C
V250LA40CX620
14
20
20
354
354
354
429
429
413
650
650
620
50
100
100
40
V250LA10C 10 354 429 650 25 2
80
80
100
600
600
1600
V275LA20C
V275LA40C
V275LA40CX680
14
20
20
389
389
389
473
473
453
710
710
680
50
100
100
40
80
80
600
V275LA10C 10 389 473 710 25 2 100
1600
1600
V300LA20C
V300LA40C
V300LA40CX745
14
20
20
420
420
420
517
517
490
775
775
745
50
100
100
40
80
80
600
V300LA10C 10 420 517 775 25 2 100
1600
1600
V320LA20C
V320LA40C
14
20
462
462
565
565
850
850
50
100
40
80
600
V320LA10C 10 462 565 850 25 2 100
1600
V385LA20C
V385LA40C
14
20
558
558
682
682
1025
1025
50
100
40
80
600
1600
V420LA20C
V420LA40C
14
20
610
610
748
748
1120
1120
50
100
40
80
600
1600
V460LA40C
V480LA80C
20
20
640
670
790
825
1190
1240
100
100
80
80
1600
1600
V510LA80C 20 735 910 1350 100 80 1600
V550LA80C 20 780 970 1435 100 80 1600
V575LA80C 20 805 1000 1500 100 80 1600
V625LA80C 20 900 1100 1725 100 80 1600
V660LA80C 20 940 1210 1820 100 80 1600
NOTE: Average power dissipation of transients not to exceed 0.6W and 1W for model sizes 14mm and 20mm, respectively.
• 7mm and 12mm parts also available-contact factory for further information
• For additional or intermediary volta
e ratin
s contact factory
•
µ
V320LA40CX810 20 462 540 810 100 80 1600
PART
NUMBER
Pb
RoHS
LEAD-FREE
AND RoHS
COMPLIANT
MODELS
V130LA10CP
V130LA20CP
V130LA20CX325P
V130LA5CP
V140LA10CP
V140LA20CP
V140LA20CX340P
V140LA5CP
V150LA10CP
V150LA20CP
V150LA20CX360P
V150LA5CP
V175LA10CP
V175LA20CP
V175LA20CX425P
V175LA5CP
V230LA20CP
V230LA40CP
V230LA40CX570P
V230LA10CP
V250LA20CP
V250LA40CP
V250LA40CX620P
V250LA10CP
V275LA20CP
V275LA40CP
V275LA40CX680P
V275LA10CP
V300LA20CP
V300LA40CP
V300LA40CX745P
V300LA10CP
V320LA20CP
V320LA40CP
V320LA10CP
V385LA20CP
V385LA40CP
V420LA20CP
V420LA40CP
V460LA40CP
V480LA80CP
V510LA80CP
V550LA80CP
V575LA80CP
V625LA80CP
V660LA80CP
V320LA40CX810P
STANDARD
MODELS
C-III Series Specifications
Varistor Products
Pb
RoHS
51
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Varistor Products
High Energy Radial Lead
C-III V aristor Series
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
100
90
50
10
O
1
T
T
1
T
2
TIME
PERCENT OF PEAK VALUE
O
1
= 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 8/20 s Current Waveform:
8 s = T
1
= Virtual Front Time
20 s = T
2
= Virtual Time to Half Value
10,000
1,000
100
0.001 0.01 0.1 1 1.0 100 1000 10000
V420LA20C(P)
V385LA20C(P)
V275LA20C(P)
V250LA20C(P)
MODEL SIZE = 14mm
V320LA20C(P)
V300LA20C(P)
V230LA20C(P)
V175LA10C(P)
V150LA10C(P)
V140LA10C(P)
V130LA10C(P)
Power Dissipation Ratings
Should transients occur
in rapid succession, the
average power
dissipation is the energy
(watt-seconds) per pulse
times the number of puls-
es per second.The
power so developed
must be within the speci-
fications shown on the
Device Ratings and
Specifications table for the specific device.The operating values
of a MOV need to be deratedat high temperatures as shown in
Figure 1. Because varistors only dissipate a relatively small
amount of average power they are not suitable 0for repetitive
applications that involve substantial amounts of average power
dissipation.
100
90
80
70
60
50
40
30
20
10
0
-55 50 60 70 80 90 100 110 120 130 140 150
AMBIENT TEMPERA TURE (
o
C)
PERCENT OF RATED VALUE
FIGURE 1. CURRENT, ENERGY AND PO WER DERATING
CURVE
V320LA10C(P)
V300LA10C(P)
V275LA10C(P)
V250LA10C(P)
V175LA5C(P)
V150LA5C(P)
V140LA5C(P)
V130LA5C(P)
V230LA10C(P)
MODEL SIZE = 10mm
10,000
1,000
100
0.001 0.01 0.1 1 1.0 100 1000 10000
MODEL SIZE = 20mm
10,000
1,000
100
0.001 0.01 0.1 1 1.0 100 1000 10000
V575LA80C(P)
V660LA100C(P)
V625LA80C(P)
V510LA80C(P)
V480LA80C(P)
V420LA40C(P)
V385LA40C(P)
V175LA20C(P)
V150LA20C(P)
V140LA20C(P)
V130LA20C(P)
V230LA40C(P)
V250LA40C(P)
V275LA40C(P)
V300LA40C
(P)
V320LA40C(P)
10,000
1,000
100
0.001 0.01 0.1 1 1.0 100 1000 10000
V300LA40CX745(P)
V275LA40CX680(P)
V250LA40CX620(P)
V230LA40CX570(P)
V175LA20CX425(P)
V150LA20CX360(P)
V140LA20CX340(P)
V130LA20CX325(P)
V300LA40CX810(P)
Transient V-I Characteristics Curves
Maximum Voltage (V)
Maximum Voltage (V)
Maximum Voltage (V)
Maximum Voltage (V)
Peak Amperes (A) Peak Amperes (A)
Figure 3. Maximum Clamping Voltage for 10mm Par ts
(V130LA5C(P) -V320LA10C(P)) Figure 4. Maximum Clamping Voltage for 14mm Par ts
(V130LA10C(P) -V420LA20C(P))
Figure 5. Maximum Clamping Voltage for 20mm Par ts
(V130LA20C(P) -V660LA100C(P))
Peak Amperes (A) Peak Amperes (A)
Figure 6. Maximum Clamping Voltage for Low Clamping
Voltage Par ts (V130LA20CX325(P) -V300LA40CX245(P))
2
VARISTOR
PRODUCTS
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RoHS
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Varistor Products
High Energy Radial Lead
C-III V aristor Series
Pulse Rating Curves
MODEL SIZE = 10mm
10 100 1,000 10,000
10,000
1,000
100
10
1
10
2
1
10
2
10
3
10
4
8
MODEL SIZE = 14mm
10 100 1,000 10,000
10,000
1,000
100
10
8
10
10
3
10
4
10
2
1
10
2
10
3
10
4
CIII series varistors for Hi-Temperature operating conditions:
• Phenolic Coated CIII Series devices are available with improved maxi-
mum operating maximum temperature 125°C.
• These devices also have improved temperature cycling perfor mance
capability.
• Ratings and Specifications are as per standard CIII Series except Hi-Pot
encapsulation Isolation Voltage Capability = 500V.
• To order : add X1347 to par t number (e.g.V230LA40CX1347)
• These devices are not UL, CSA, VDE or CECC cer tified.
• Contact factory for further details.
10
2
10
3
10 100 1,000 10,000
10,000
1,000
100
10
10
2
1
10
2
10
3
10
4
8
MODEL SIZE = 20mm
Peak Rated Surg e Current (A)
Surge Impulse Duration (µs)
Figure 7. Repetitive Surge Capability for 10mm Parts
(V130LA5C(P)-V320LA10C(P))
Peak Rated Surg e Current (A)
Surge Impulse Duration (µs)
Figure 8. Repetitive Surge Capability for 14mm Parts
(V130LA10C(P)-V420LA20C(P))
Peak Rated Surg e Current (A)
Surge Impulse Duration (µs)
Figure 9. Repetitive Surge Capability for 20mm Parts
(V130LA20C(P)-V660LA100C(P))
Pb
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VARISTOR
PRODUCTS
Varistor Products
High Energy Radial Lead
C-III V aristor Series
SYMBOL DESCRIPTION
MODEL SIZE
14mm10mm 20mm
P Pitch of Component 25.4 ± 1.0
P
0
Feed Hole Pitch 12.7 ± 0.2
P
1
Feed Hole Center to Pitch 8.85 ± 0.8
P
2
Hole Center to Component
Center 12.7 ± 0.7
F Lead to Lead Distance 7.50 ± 0.8
h Component Alignment 2.00 Max
W Tape Width 18.25 ± 0.75
W
0
Hold Down Tape Width 12.0 ± 0.3
W
1
Hole Position 9.125 ± 0.625
W
2
Hold Down Tape Position 0.5 Max
H Height F rom Tape Center T o
Component Base 19.0 ± 1.0
H
0
Seating Plane Height 16.0 ± 0.5
H
1
Component Height 40 Max 46.5 Max
D
0
Feed Hole Diameter 4.0 ± 0.2
t Total Tape Thickness 0.7 ± 0.2
UUnder-crimp Width
3
o
Max
pComponent Alignment Max
8.0
36 Max
Crimped Leads "LT"
Straight Leads "LS"
Under-crim
p
ed Leads "LU"
W0
P0
P1
DH
E
DH
DP
W1
W
Ft
W2
P
DP
∆b
H
∆D0
H
1
P2
E
DP DH DH
W1
W
Ft
W2W0
P
DP
C
∆b
H
0
∆D0
H
1SEATING
PLANE
P1
P1
P2
W0
P1
P0
U
DH
E
DH
DP
W1
W
Ft
W2
P
P2 DP
∆b
Ho
∆D0
H
1
Tape and Reel Specification(available for voltage ratings up to 320V only)
Pb
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Varistor Products
High Energy Radial Lead
C-III V aristor Series
Tape and Reel Data
• Conforms to ANSI and EIA Specifications
• Can be supplied to IEC publication 286-2
• Radial devices on tape and reel are supplied with either
crimped leads, straight leads, or under-crimped leads
• Available for voltage ratings up to 320V only
Tape and Reel Ordering Information
• Crimped leads are standard on LA types supplied in tape
and reel and are denoted by the model letter “T”. Also, in
tape and reel, model letter “S” denotes straight leads and
letter “U” denotes special under-crimped leads.
Example:
Shipping Quantity
Mechanical Dimensions
STANDARD
MODEL CRIMPED
LEADS STRAIGHT
LEADS
UNDER
CRIMP
LEADS
V130LA20C V130LT20C V130LS20C V130LU20C
DEVICE SIZE QUANTITY PER REEL
“T” REEL “S” REEL “U” REEL
14mm 500 500 500
20mm 500 500 500
500 500 500
10mm
Øb
e
1
e
ØD
25.4
(1.00)
E
A
Additional Lead Style Options
Radial lead types can be supplied with combination preformed crimp and
trimmed leads.This option is suppliedto the dimensions shown below.
*Seating plane interpretation per IEC-717
• To order this crimped and tr immed lead style, the standard radial
type model number “LA” is changed to the model number “LC”.This
option is supplied in bulk only.
Example:
• For 10 ± 1mm lead spacing on 20mm units only; append standard
model numbers by adding “X10” suffix.
Example:
• For other lead style variations to the above, please contact Littelfuse.
SYMBOL
VARISTOR MODEL SIZE
14mm10mm 20mm
MINMIN MAXMAX MIN MAX
A---23.5
(0.925)
19.5
(0.768)
L
TRIM
2.41
(0.095) 2.41
(0.095)
4.69
(0.185) 4.69
(0.185)
30
(1.18)
2.41
(0.095) 4.69
(0.185)
NOTE: Dimensions are in millimeters (inches).
CRIMPED AND TRIMMED LEAD
*
SEATING
PLANE
L
TRIM
A
STANDARD MODEL ORDER AS
V130LA20C V130LC20C
STANDARD MODEL ORDER AS
V130LA20C V130LC20C
VARISTOR MODEL SIZE
14mm 20mm
MIN MAX MIN MAX
20
(0.787) 26.5
(1.043)
17
(0.669) 23
(0.906)
6.5
(0.256) 8.5
(0.335) 6.5
(0.256) 8.5
(0.335)
2.5 (0.098)
4.5 (0.177) 9.0 (0.354) 4.5 (0.177) 9.0 (0.354)
5.5 (0.216) 2.5 (0.098) 5.5 (0.216)
-
- 11 (0.433) - 11 (0.433)
7.3 (0.287) - 7.3 (0.287)
0.76
(0.030) 0.86
(0.034) 0.76
(0.030) 0.86
(0.034)
Dimensions are in millimeters (inches)
1. 10mm lead spacing also available. See additional lead
style options.
(0.531) (0.689)
13.5 17.5
(0.531) (0.689)
13.5 17.5
2. 7mm and 12mm devices also available upon request.
Contact factory for details.
VRMS
VOLTAGE
MODEL
ALL
ALL
ALL
130 - 320
ALL
SYMBOL
A
ØD
e
e1
130 - 320
>320
>320
E
Øb
10mm
MIN MAX
(0.472)
12 (0.630)
16
(0.394)
10 (0.492)
12.5
6.5
(0.256) 8.5
(0.335)
2.5
(0.098) 5.5
(0.216)
-7.3
(0.287)
0.76
(0.030) 0.86
(0.034)
Pb
RoHS
55
www.littelfuse.com
2
VARISTOR
PRODUCTS
Varistor Products
High Energy Radial Lead
C-III V aristor Series
AC Bias Reliability
The C-III series of metal oxide var istors was designed for use on the AC
line.The varistor is connected across the AC line and is biased with a
constant amplitude sinusoidal voltage. It should be noted that the definition
of failure is a shift in the nominal varistor voltage (VN) exceeding ±10%.
Although this type of varistor is still functioning normally after this
magnitude of shift, devices at the lower extremities of VN tolerance
will begin to dissipate more power.
Because of this possibility, an extensive series of statistically designed
tests were perfor med to deter mine the reliability of the C-III type of varistor
under AC bias combined with high levels of temperature stress. To date,
this test has generated over 50,000 device hours of operation at a tempera-
ture of 125oC, although only rated at 85oC. Changes in the nominal varistor
voltage, measured at 1mA, of less than 2% have been recorded (Figure 8).
Transient Surge Current/Energy
Transient Capability
The transient surge rating serves as an excellent figure of mer it for the C-III
varistor.This inherent surge handling capability is one of the C-III varistor’s
best features. The enhanced surge absorption capability results from
improved process uniformity and enhanced constr uction.The homogeneity
of the raw material powder and improved control over the sinter ing and
assembly processes are contributing factors to this improvement.
In the low power AC mains environment, industry standards (UL, IEC,
NEMA and IEEE) all suggest that the worst case surge occurrence will be
3kA. Such a transient event may occur up to five times over the equipment
life time (approximately 10 years).While the occu rences of five 3kA
transients is the required capability, the rated, repetitive surge current for
the C-III series is 80 pulses for the 20mm units and 40 pulses for the
Additionally, all 20mm C-III devices are listed to the “Permanently
Connected” category (10kA) of UL1449, by Underwriter’s Laborator ies, Inc.
As a measure of the inherent device capability, samples of the 20mm
V130LA20C devices were subjected to a worst case repetitive transient
surges test. After 100 pulses, each of 3kA, there was negligible change
in the device character istics. Changes in the clamping voltage, measured
at 100 amps, of less than 3% were recorded (Figure 9). Samples of the
14mm Series V175LA20C were subjected to repetitive surge occurrences
of 750A. Again, there was negligible changes in any of the device
characteristics after 2000 pulses (Figure 10). In both cases the inherent
device capability is far in excess of the expected worst case scenario.
FIGURE 8. HIGH TEMPERATURE OPERATING LIFE 125
o
C
FOR 1000 HOURS AT RATED BIAS
300
250
200
150
100
0 100 200 300 400 500 600 700 800 900 1000 1100
TIME (HOURS)
V
NOM
AT 1mA (V)
V130LA20C
FIGURE 9. TYPICAL REPETITIVE SURGE CURRENT
CAPABILITY OF C-III SERIES MOVs
FIGURE 10. TYPICAL REPETITIVE SURGE CURRENT
CAPABILITY OF C-III SERIES MOVs
500
450
400
350
300
0 102030405060708090100110120
NUMBER OF SURGES
CLAMPING VOLTAGE AT 3kA
600
550
500
450
400
350
300 0200 400 600 800 1000 1200 1400 1600 2000
NUMBER OF SURGES
CLAMPING VOLTAGE AT 750A
V130LA20C
3kA (8/20µs)
(RATED FOR 80 PULSES)
V175LA20C
750A (8/20µs)
(RATED FOR 1600 PULSES)
VARISTOR
V
M(AC)
130V to 1,000V
SERIES DESIGNATOR/
LEADSTYLE DESIGNATOR
LC = Crimped and Clipped
LS = Straight
LT = Crimped
LU = Under Crimped
V XXX LA XX C
RELATIVE ENERGY INDICATOR
(One or Two Digits)
P: LEAD-FREE AND
RoHS COMPLIANT OPTION
P+ Optional Suffix
Other Options
Base Part #
Ordering Information
C-III series Varistors are shipped standard in bulk pack with straight
leads and lead spacing outlined in the package dimensions on page 4-
13. Contact your Littelfuse sales representative to discuss the non-stan-
dard options outlined below.
For Lead-free and RoHS compliant parts add the letter ‘P’ after the base
par t number and before any option as shown in the ordering example
below.
ex:V150LS20CP
V300LS40CPX745
Pb
RoHS