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Varistor Products
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 applications 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.
(R)
(R)
D
V
E
Features
* High Energy Absorption Capability WTM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45J to 210J (2ms) * High Pulse Life Rating * High Peak Pulse Current Capability ITM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6000A to 9000A (8/20s) * 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 ULTRAMOVTM VARISTOR SERIES
1
Varistor Products
High Energy Radial Lead
C-III Varistor Series
Absolute Maximum Ratings
For ratings of individual members of a series, see Device Ratings and Specifications chart
C-III SERIES Continuous: Steady State AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 320 Transients: Single-Pulse Peak Current (ITM) 8/20s Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6000 to 9000 Single-Pulse Energy Range (WTM) 2ms Rectangular Wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 to 210
Maximum Temporary Overvoltage of VM(AC): 5 Minutes Duration @ 25oC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 5 Minutes Duration @ 125oC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 85 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to125 Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
UNITS
V A J % % C C %/oC
o o
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 g
MAXIMUM RATINGS (85 oC) CONTINUOUS WITHSTANDING ENERGY (2ms) WTM ( ) (J) 45 90 90 50 100 100 55 110 110 60 120 120 80 160 160 100 170 170 110 190 190 120 210 210 130 220 TRANSIENT PEAK CURRENT (8/20 s) ITM1 1 PULSE (A) 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 9000 6000 9000 ITM2 2 PULSES (A) 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000 7000 5000 7000
PART NUMBER V130LA10C V130LA20C V130LA20CX325 V140LA10C V140LA20C V140LA20CX340 V150LA10C V150LA20C V150LA20CX360 V175LA10C V175LA20C V175LA20CX425 V230LA20C V230LA40C V230LA40CX570 V250LA20C V250LA40C V250LA40CX620 V275LA20C V275LA40C V275LA40CX680 V300LA20C V300LA40C V300LA40CX745 V320LA20C V320LA40C
BRAND 130L10C 130L20C 130CX325 140L10C 140L20C 140CX340 150L10C 150L20C 150CX360 175L10C 175L20C 175CX425 230L20C 230L40C 230X570 250L20C 250L40C 250CX620 275L20C 275L40C 275CX680 300L20C 300L40C 300CX745 320L20C 320L40C
MAXIMUM V RMS VM(AC) (V) 130 130 130 140 140 140 150 150 150 175 175 175 230 230 230 250 250 250 275 275 275 300 300 300 320 320
2
Varistor Products
High Energy Radial Lead
C-III Varistor Series
C-III Series Specifications
SPECIFICATIONS (25 oC) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT PART NUMBER V130LA10C V130LA20C V130LA20CX325 V140LA10C V140LA20C V140LA20CX340 V150LA10C V150LA20C V150LA20CX360 V175LA10C V175LA20C V175LA20CX425 V230LA20C V230LA40C V230LA40CX570 V250LA20C V250LA40C V250LA40CX620 V275LA20C V275LA40C V275LA40CX680 V300LA20C V300LA40C V300LA40CX745 V320LA20C V320LA40C MODEL SIZE DISC DIAMETER (mm) 14 20 20 14 20 20 14 20 20 14 20 20 14 20 20 14 20 20 14 20 20 14 20 20 14 20 VN MIN (V) 184 184 184 198 198 198 212 212 212 247 247 247 324 324 324 354 354 354 389 389 389 420 420 420 462 462 VN MAX (V) 228 228 220 242 242 230 268 268 243 303 303 285 396 396 384 429 429 413 473 473 453 517 517 490 565 565 MAXIMUM CLAMPING VOLTAGE (8/20s) VC (V) 340 340 325 360 360 340 395 395 360 455 455 425 595 595 570 650 650 620 710 710 680 775 775 745 850 850 Ip (A) 50 100 100 50 100 100 50 100 100 50 100 100 50 100 100 50 100 100 50 100 100 50 100 100 50 100 DUTY CYCLE SURGE RATING 3kA (8/20s) # PULSES 10 20 20 10 20 20 10 20 20 10 20 20 10 20 20 10 20 20 10 20 20 10 20 20 10 20 750A (8/20s) # PULSES 80 120 120 80 120 120 80 120 120 80 120 120 80 120 120 80 120 120 80 120 120 80 120 120 80 120
NOTE: Average power dissipation of transients not to exceed 0.6W and 1W for model sizes 14mm and 20mm, respectively.
Power Dissipation Ratings
PERCENT OF RATED VALUE
100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 AMBIENT TEMPERATURE ( oC) 130 140 150
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.
FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE
3
Varistor Products
High Energy Radial Lead
C-III Varistor Series
PERCENT OF PEAK VALUE 100 90
50
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 8/20s Current Waveform: 8s = T1 = Virtual Front Time 20s = T2 = Virtual Time to Half Value
10 O1 T T1 T2 TIME
FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
2,000 MAXIMUM PEAK VOLTAGE (V) MODEL SIZE = 14mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING MAXIMUM PEAK VOLTAGE (V) 2,000 V320LA40C V300LA40C V275LA40C V250LA40C V230LA40C MODEL SIZE = 20mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING
1,000
V320LA20C V300LA20C V275LA20C V250LA20C V230LA20C
1,000
500
500
300 200 V175LA10C V150LA10C V140LA10C V130LA10C 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 104
300 200 V175LA20C V150LA20C V140LA20C V130LA20C 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 104
100 10-3
100 10-3
FIGURE 3. MAXIMUM CLAMPING VOLTAGE FOR V130LA10C TO V320LA20C
FIGURE 4. MAXIMUM CLAMPING VOLTAGE FOR V130LA20C TO V320LA40C
MAXIMUM PEAK VOLTAGE (V)
1,000
V300LA40CX745 V275LA40CX680 V250LA40CX620 V230LA40CX570
MODEL SIZE = 20mm TA = -55oC TO 85oC 130 TO 300VM(AC) RATING
V175LA20CX425 V150LA20CX360 V140LA20CX340 V130LA20CX325 100 10-3 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 104
FIGURE 5. MAXIMUM CLAMPING VOLTAGE FOR V130LA20CX325 TO V300LACX745
4
Varistor Products
High Energy Radial Lead
C-III Varistor Series
Pulse Rating Curves
10,000 10 RATED PEAK SURGE CURRENT (A) 102 103 104 100 INDEFINITE SURGE CAPABILITY 10 1 2 MODEL SIZE = 14mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING 10,000 RATED PEAK SURGE CURRENT (A) 10 102 1,000 103 104 1 2 MODEL SIZE = 20mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING
1,000
100
INDEFINITE SURGE CAPABILITY
10
1 10
1 100 1,000 10,000 SURGE IMPULSE DURA TION ( s)
10
100
1,000
10,000
SURGE IMPULSE DURA TION ( s)
FIGURE 6. REPETITIVE SURGE CAPABILITY FOR V130LA10C TO V320LA20C
FIGURE 7. REPETITIVE SURGE CAPABILITY FOR V130LA20C TO V320LA40C
Tape and Reel Specification
SYMBOL P P0 P1 P2 F h W W0 W1 W2 H H0 H1 D0 t L p DESCRIPTION Pitch of Component Feed Hole Pitch Feed Hole Center to Pitch Hole Center to Component Center Lead to Lead Distance Component Alignment Tape Width Hold Down Tape Width Hole Position Hold Down Tape Position Height From Tape Center To Component Base Seating Plane Height Component Height Feed Hole Diameter Total Tape Thickness Length of Clipped Lead Component Alignment
MODEL SIZE 14mm 20mm
25.4 1.0 12.7 0.2 2.60 0.7 6.35 1.0 7.50 0.8 2.00 Max 18.25 0.75 6.00 0.3 12.0 0.3 9.125 0.625 0.5 Max 19.0 1.0 16.0 0.5 40 Max 46.5 Max
4.0 0.2 0.7 0.2 12.0 Max 3o Max
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Varistor Products
High Energy Radial Lead
C-III Varistor 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
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.
VARISTOR MODEL SIZE 14mm SYMBOL A MIN MAX 24.5 (0.96) 4.69 (0.185) MIN 20mm MAX 3 1 (1.22) 4.69 (0.185)
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:
STANDARD MODEL V130LA20C CRIMPED LEADS V130LT20C STRAIGHT LEADS V130LS20C UNDER CRIMP LEADS V130LU20C
LTRIM
2.41 (0.095)
2.41 (0.095)
NOTE: Dimensions are in millimeters (inches).
Shipping Quantity
QUANTITY PER REEL DEVICE SIZE 14mm 20mm "T"REEL 500 500 "S"REEL 500 500 "U"REEL 500 500
CRIMPED AND TRIMMED LEAD
*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:
STANDARD MODEL V130LA20C ORDER AS V130LC20C
* For 10 1mm lead spacing on 20mm units only; append standard model numbers by adding "X10" suffix.
VARISTOR MODEL SIZE VRMS VOLTAGE MODEL ALL ALL ALL 130 - 250 275 - 550 E 130 - 250 275 - 550 Ob ALL 14mm MIN 13.5 (0.531) 13.5 (0.531) 6.5 (0.256) 2.5 (0.098) 4.5 (0.177) 0.76 (0.030) MAX 20 (0.787) 17 (0.669) 8.5 (0.335) 5.5 (0.216) 9.0 (0.354) 7.3 (0.287) 11 (0.433) 0.86 (0.034) MIN 17.5 (0.689) 17.5 (0.689) 6.5 (0.256) 2.5 (0.098) 4.5 (0.177) 0.76 (0.030) 20mm MAX 26.5 (1.043) 23 (0.906) 8.5 (0.335) 5.5 (0.216) 9.0 (0.354) 7.3 (0.287) 11 (0.433) 0.86 (0.034)
STANDARD MODEL V130LA20C
ORDER AS V130LC20C
SYMBOL A OD e e1
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 combination of electrical, environmental and mechanical tests. A summary of the reliability tests performed on the C-III series are described in Table 1.
Dimensions are in millimeters (inches) NOTE: 10mm lead spacing also available. See additional lead style options.
6
Varistor Products
High Energy Radial Lead
C-III Varistor Series
TEST Surge Current REFERENCE STANDARD UL 1449 IEEE/ANSI C62.41 IEC 1051 TEST CONDITIONS 9000A (8/20s) 1 Pulse 7000A (8/20s) 2 Pulses 3000A (8/20s) 20 Pulses 750A (8/20s) 120 Pulses Surge Energy UL 1449 IEEE/ANSI C62.41 IEC 1051 Mil-Std-202 Method 204D 90J (2ms) 1 Pulse 125oC, 1000 Hours, Rated Bias Voltage 120% Maximum Rated Varistor Voltage For 5 Minutes TEST RESULTS 0/165
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 occurrences 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.
300 V130LA20C VNOM AT 1mA (V)
0/105
0/75
0/65
250
200
0/125
150
Operating Life
0/180 0/70
100 0
100
200
300
400 500 600 700 TIME (HOURS)
800
900 1000 1100
Temporary N/A Overvoltage
FIGURE 8. HIGH TEMPERATURE OPERATING LIFE 125 oC FOR 1000 HOURS AT RATED BIAS
CLAMPING VOLTAGE AT 3kA 500 V130LA20C 3kA (8/20s)
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 temperature 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).
450
400
350 (RATED FOR 20 SURGES) 300 0 10 20 30 40 50 60 70 80 NUMBER OF SURGES 90 100 110 120
FIGURE 9. TYPICAL REPETITIVE SURGE CURRENT CAPABILITY OF C-III SERIES MOVs
CLAMPING VOLTAGE AT 750A
600 550 500 450 400 350 300 0 (RATED FOR 80 SURGES) 50 100 150 200
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
V175LA20C 750A (8/20s)
250
300
NUMBER OF SURGES
FIGURE 10. TYPICAL REPETITIVE SURGE CURRENT CAPABILITY OF C-III SERIES MOVs
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