Varistor Products
1
High Energy Radial Lead
C-III Varistor Series
The C-III Series of metal-oxide varistors are specifically designed for
high surge energy absorption ratings. 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 primarily 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 14 and 20mm disc versions with various
lead options.
These types are shipped in bulk or Tape and Reel packaging. Part
number and brand information is provided in the Ratings table.
Features
• High Energy Absorption Capability
WTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45J to 210J
(2ms)
• High Pulse Life Rating
• High Peak Pulse Current Capability
ITM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6000A to 9000A
(8/20µs)
• Wide Operating Voltage Range
VM(AC)RMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130V to
320V
• 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.
AGENCY FILE NUMBERS: UL E75961, CSA LR91788,
VDE 116895E, CECC 42201-006.
ALSO SEE LITTELFUSE
ULTRAMOV™VARISTOR SERIES
®
®
V
DE
High Energy Radial Lead
C-III Varistor Series
Varistor Products
2
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 320 V
Transients:
Single-Pulse Peak Current (ITM) 8/20µs Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6000 to 9000 A
Single-Pulse Energy Range (WTM) 2ms Rectangular Wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 to 210 J
Maximum Temporary Overvoltage 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 (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 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
g
PART
NUMBER BRAND
MAXIMUM RATINGS (85oC)
CONTINUOUS TRANSIENT
MAXIMUM VRMS
VM(AC)
(V)
WITHSTANDING
ENERGY (2ms)
WTM ()
(J)
PEAK CURRENT (8/20µs)
ITM1 1 PULSE
(A)
ITM2 2 PULSES
(A)
V130LA10C
V130LA20C
V130LA20CX325
130L10C
130L20C
130CX325
130
130
130
45
90
90
6000
9000
9000
5000
7000
7000
V140LA10C
V140LA20C
V140LA20CX340
140L10C
140L20C
140CX340
140
140
140
50
100
100
6000
9000
9000
5000
7000
7000
V150LA10C
V150LA20C
V150LA20CX360
150L10C
150L20C
150CX360
150
150
150
55
110
110
6000
9000
9000
5000
7000
7000
V175LA10C
V175LA20C
V175LA20CX425
175L10C
175L20C
175CX425
175
175
175
60
120
120
6000
9000
9000
5000
7000
7000
V230LA20C
V230LA40C
V230LA40CX570
230L20C
230L40C
230X570
230
230
230
80
160
160
6000
9000
9000
5000
7000
7000
V250LA20C
V250LA40C
V250LA40CX620
250L20C
250L40C
250CX620
250
250
250
100
170
170
6000
9000
9000
5000
7000
7000
V275LA20C
V275LA40C
V275LA40CX680
275L20C
275L40C
275CX680
275
275
275
110
190
190
6000
9000
9000
5000
7000
7000
V300LA20C
V300LA40C
V300LA40CX745
300L20C
300L40C
300CX745
300
300
300
120
210
210
6000
9000
9000
5000
7000
7000
V320LA20C
V320LA40C
320L20C
320L40C
320
320
130
220
6000
9000
5000
7000
C-III Varistor Series
Varistor Products
High Energy Radial Lead
3
C-III Series Specifications
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 0for repetitive applications that involve substantial amounts of
average power dissipation.
PART
NUMBER
MODEL SIZE
DISC
DIAMETER (mm)
SPECIFICATIONS (25oC)
VARISTOR VOLTAGE AT 1mA
DC TEST CURRENT
MAXIMUM CLAMPING
VOLTAGE
(8/20µs)
DUTY CYCLE
SURGE RATING
VN MIN
(V)
VN MAX
(V)
VC
(V)
Ip
(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
10
20
20
80
120
120
V140LA10C
V140LA20C
V140LA20CX340
14
20
20
198
198
198
242
242
230
360
360
340
50
100
100
10
20
20
80
120
120
V150LA10C
V150LA20C
V150LA20CX360
14
20
20
212
212
212
268
268
243
395
395
360
50
100
100
10
20
20
80
120
120
V175LA10C
V175LA20C
V175LA20CX425
14
20
20
247
247
247
303
303
285
455
455
425
50
100
100
10
20
20
80
120
120
V230LA20C
V230LA40C
V230LA40CX570
14
20
20
324
324
324
396
396
384
595
595
570
50
100
100
10
20
20
80
120
120
V250LA20C
V250LA40C
V250LA40CX620
14
20
20
354
354
354
429
429
413
650
650
620
50
100
100
10
20
20
80
120
120
V275LA20C
V275LA40C
V275LA40CX680
14
20
20
389
389
389
473
473
453
710
710
680
50
100
100
10
20
20
80
120
120
V300LA20C
V300LA40C
V300LA40CX745
14
20
20
420
420
420
517
517
490
775
775
745
50
100
100
10
20
20
80
120
120
V320LA20C
V320LA40C
14
20
462
462
565
565
850
850
50
100
10
20
80
120
NOTE: Average power dissipation of transients not to exceed 0.6W and 1W for model sizes 14mm and 20mm, respectively.
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 ( oC)
PERCENT OF RATED VALUE
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE
High Energy Radial Lead
C-III Varistor Series
Varistor Products
4
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. MAXIMUM CLAMPING VOLTAGE FOR V130LA10C
TO V320LA20C
1,000
100
PEAK AMPERES (A)
MAXIMUM PEAK VOLTAGE (V)
V175LA10C
V150LA10C
V140LA10C
V130LA10C
MODEL SIZE = 14mm
TA = -55oC TO 85oC
130 TO 320VM(AC) RATING
10-2 10-1 100101102103104
10-3
2,000
500
300
200
V300LA20C
V275LA20C
V250LA20C
V230LA20C
V320LA20C
FIGURE 4. MAXIMUM CLAMPING VOLTAGE FOR V130LA20C
TO V320LA40C
1,000
100
MAXIMUM PEAK VOLTAGE (V)
MODEL SIZE = 20mm
TA = -55oC TO 85oC
130 TO 320VM(AC) RATING
PEAK AMPERES (A)
10-2 10-1 100101102103104
10-3
V175LA20C
V150LA20C
V140LA20C
V130LA20C
V300LA40C
V275LA40C
V250LA40C
V230LA40C
V320LA40C
500
300
200
2,000
FIGURE 5. MAXIMUM CLAMPING VOLTAGE FOR V130LA20CX325 TO V300LACX745
1,000
100
PEAK AMPERES (A)
MAXIMUM PEAK VOLTAGE (V)
V175LA20CX425
V150LA20CX360
V140LA20CX340
V130LA20CX325
MODEL SIZE = 20mm
TA = -55oC TO 85oC
130 TO 300VM(AC) RATING
10-2 10-1 100101102103104
10-3
V300LA40CX745
V275LA40CX680
V250LA40CX620
V230LA40CX570
Transient V-I Characteristics Curves
C-III Varistor Series
Varistor Products
High Energy Radial Lead
5
Pulse Rating Curves
FIGURE 6. REPETITIVE SURGE CAPABILITY FOR
V130LA10C TO V320LA20C
10,000
1,000
100
10
110 100 1,000 10,000
SURGE IMPULSE DURATION (µs)
RATED PEAK SURGE CURRENT (A)
10 12
102
103
104
INDEFINITE
SURGE
CAPABILITY
MODEL SIZE = 14mm
TA = -55oC TO 85oC
130 TO 320VM(AC) RATING
FIGURE 7. REPETITIVE SURGE CAPABILITY FOR
V130LA20C TO V320LA40C
10,000
1,000
100
10
110 100 1,000 10,000
SURGE IMPULSE DURATION (µs)
RATED PEAK SURGE CURRENT (A)
12
103
104
INDEFINITE
SURGE
CAPABILITY
MODEL SIZE = 20mm
TA = -55oC TO 85oC
130 TO 320VM(AC) RATING
10
102
SYMBOL DESCRIPTION
MODEL SIZE
14mm 20mm
P Pitch of Component 25.4 ± 1.0
P0Feed Hole Pitch 12.7 ± 0.2
P1Feed Hole Center to Pitch 2.60 ± 0.7
P2Hole Center to Component
Center
6.35 ± 1.0
F Lead to Lead Distance 7.50 ± 0.8
h Component Alignment 2.00 Max
W Tape Width 18.25 ± 0.75
W0Hold Down Tape Width 6.00 ± 0.3 12.0 ± 0.3
W1Hole Position 9.125 ± 0.625
W2Hold Down Tape Position 0.5 Max
H Height From Tape Center To
Component Base
19.0 ± 1.0
H0Seating Plane Height 16.0 ± 0.5
H1Component Height 40 Max 46.5 Max
D0Feed Hole Diameter 4.0 ± 0.2
t Total Tape Thickness 0.7 ± 0.2
L Length of Clipped Lead 12.0 Max
p Component Alignment 3o Max
Tape and Reel Specification
High Energy Radial Lead
C-III Varistor Series
Varistor Products
6
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
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
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
VRMS
VOLTAGE
MODEL
VARISTOR MODEL SIZE
14mm 20mm
MIN MAX MIN MAX
ALL 20
(0.787)
26.5
(1.043)
ALL 17
(0.669)
23
(0.906)
ALL 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)
130 - 250
275 - 550
ALL
SYMBOL
A
ØD
e
e1
-
- 11 (0.433) - 11 (0.433)
7.3 (0.287) - 7.3 (0.287)
130 - 250
275 - 550
E
Øb 0.76
(0.030)
0.86
(0.034)
0.76
(0.030)
0.86
(0.034)
Dimensions are in millimeters (inches)
NOTE: 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
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 trimmed 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.
Reliability Performance of C-III Series
The electrical ratings of the C-III series of MOVs are conservatively
stated. Samples of these devices have been tested under additional
stresses, over and above those called out in the data sheet. The results
of this testing show an enhanced device performance.
The series of stress tests to which the units were subjected are a combi-
nation of electrical, environmental and mechanical tests. A summary of
the reliability tests performed on the C-III series are described in Table 1.
SYMBOL
VARISTOR MODEL SIZE
14mm 20mm
MIN MAX MIN MAX
A - 24.5
(0.96)
-31
(1.22)
LTRIM 2.41
(0.095)
4.69
(0.185)
2.41
(0.095)
4.69
(0.185)
NOTE: Dimensions are in millimeters (inches).
CRIMPED AND TRIMMED LEAD
7
C-III Varistor Series
Varistor Products
High Energy Radial Lead
TABLE 1.
AC Bias Reliability
The C-III series of metal oxide varistors 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 performed to determine 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 merit 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 construction. The homogeneity
of the raw material powder and improved control over the sintering 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 conservatively rated, repetitive
Additionally, all 20mm C-III devices are listed to the “Permanently
Connected” category (10kA) of UL1449, by Underwriter’s Laboratories, 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 characteristics. 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 occur-
rences of 750A. Again, there was negligible changes in any of the device
characteristics after 250 pulses (Figure 10). In both cases the inherent
device capability is far in excess of the expected worst case scenario.
TEST
REFERENCE
STANDARD
TEST
CONDITIONS
TEST
RESULTS
Surge
Current
UL 1449
IEEE/ANSI
C62.41
9000A
(8/20µs)
1 Pulse
0/165
IEC 1051 7000A
(8/20µs)
2 Pulses
0/105
3000A
(8/20µs)
20 Pulses
0/75
750A
(8/20µs)
120 Pulses
0/65
Surge
Energy
UL 1449
IEEE/ANSI
C62.41
IEC 1051
90J
(2ms)
1 Pulse
0/125
Operating
Life
Mil-Std-202
Method 204D
125oC, 1000 Hours,
Rated Bias Voltage
0/180
Temporary
Overvoltage
N/A 120% Maximum
Rated Varistor Voltage
For 5 Minutes
0/70
FIGURE 8. HIGH TEMPERATURE OPERATING LIFE 125 oC
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)
VNOM 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
3000 102030405060708090100110120
NUMBER OF SURGES
(RATED FOR 20 SURGES)
CLAMPING VOLTAGE AT 3kA
V130LA20C
3kA (8/20µs)
600
550
500
450
400
350
300 0 50 100 150 200 250 300
NUMBER OF SURGES
(RATED FOR 80 SURGES)
CLAMPING VOLTAGE AT 750A
V175LA20C
750A (8/20µs)