Varistor Products High Energy Radial Lead C-III Varistor Series (R) (R) D V E 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. 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 w w w. l i t t e l f u s e . c o m 52 Varistor Products High Energy Radial Lead C-III Varistor Series 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 UNITS V A J % % 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 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 Ratingsg MAXIMUM RATINGS (85 oC) CONTINUOUS PART NUMBER BRAND TRANSIENT PEAK CURRENT (8/20 s) MAXIMUM V RMS VM(AC) (V) WITHSTANDING ENERGY (2ms) WTM ( ) (J) 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 53 w w w. l i t t e l f u s e . c o m 2 VARISTOR PRODUCTS Absolute Maximum Ratings Varistor Products High Energy Radial Lead C-III Varistor Series C-III Series Specifications SPECIFICATIONS (25 oC) MAXIMUM CLAMPING VOLTAGE (8/20s) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT DUTY CYCLE SURGE RATING MODEL SIZE DISC DIAMETER (mm) VN MIN (V) VN MAX (V) VC (V) Ip (A) 3kA (8/20s) # PULSES 750A (8/20s) # 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 PART NUMBER 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 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. 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 FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE w w w. l i t t e l f u s e . c o m 54 Varistor Products High Energy Radial Lead PERCENT OF PEAK VALUE C-III Varistor Series 100 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 50 2 VARISTOR PRODUCTS 90 10 O1 T TIME T1 T2 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM Transient V-I Characteristics Curves 1,000 V320LA20C V300LA20C V275LA20C V250LA20C V230LA20C 2,000 MAXIMUM PEAK VOLTAGE (V) MAXIMUM PEAK VOLTAGE (V) 2,000 MODEL SIZE = 14mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING 500 300 V175LA10C V150LA10C V140LA10C V130LA10C 200 100 10-3 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 MAXIMUM PEAK VOLTAGE (V) 500 300 V175LA20C V150LA20C V140LA20C V130LA20C 200 100 10-3 104 10-2 10-1 100 101 102 PEAK AMPERES (A) 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 55 103 104 FIGURE 4. MAXIMUM CLAMPING VOLTAGE FOR V130LA20C TO V320LA40C FIGURE 3. MAXIMUM CLAMPING VOLTAGE FOR V130LA10C TO V320LA20C 1,000 1,000 V320LA40C V300LA40C V275LA40C V250LA40C V230LA40C MODEL SIZE = 20mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING w w w. l i t t e l f u s e . c o m Varistor Products High Energy Radial Lead C-III Varistor Series Pulse Rating Curves 1 RATED PEAK SURGE CURRENT (A) 10 1,000 2 MODEL SIZE = 14mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING 102 103 104 100 INDEFINITE SURGE CAPABILITY 10 1 10 10,000 RATED PEAK SURGE CURRENT (A) 10,000 10 102 1,000 2 MODEL SIZE = 20mm TA = -55oC TO 85oC 130 TO 320VM(AC) RATING 103 1,000 104 100 INDEFINITE SURGE CAPABILITY 10 1 100 1 10,000 10 100 1,000 10,000 SURGE IMPULSE DURATION ( s) SURGE IMPULSE DURATION ( s) FIGURE 7. REPETITIVE SURGE CAPABILITY FOR V130LA20C TO V320LA40C FIGURE 6. REPETITIVE SURGE CAPABILITY FOR V130LA10C TO V320LA20C CIII series varistors for Hi-Temperature operating conditions: * Phenolic Coated CIII Series devices are available with improved maximum operating maximum temperature 125C. * These devices also have improved temperature cycling performance capability. * Ratings and Specifications are as per standard CIII Series except Hi-Pot encapsulation Isolation Voltage Capability = 500V. * To order: add X1347 to part number (e.g. V230LA40CX1347) * Marked identifier will contain 'P' to denote Phenolic. * These devices are not UL, CSA, VDE or CECC certified. * Contact factory for further details. w w w. l i t t e l f u s e . c o m 56 Varistor Products High Energy Radial Lead C-III Varistor Series Tape and Reel Specification P E DP MODEL SIZE DP DH DH SYMBOL C SEATING PLANE H1 W0 W2 W1 b H0 W DESCRIPTION 14mm 20mm P Pitch of Component 25.4 1.0 P0 Feed Hole Pitch 12.7 0.2 P1 Feed Hole Center to Pitch 8.85 0.8 P2 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 W0 Hold Down Tape Width W1 Hole Position W2 Hold Down Tape Position D0 P1 t F P1 Crimped Leads "LT" P2 P E DP DP DH DH H1 W0 W2 W1 H b 18.25 0.75 12.0 0.3 9.125 0.625 0.5 Max H Height From Tape Center To Component Base 19.0 1.0 H0 Seating Plane Height 16.0 0.5 H1 Component Height D0 Feed Hole Diameter 4.0 0.2 t Total Tape Thickness 0.7 0.2 p Component Alignment 3o Max U Under-crimp Width 8.0 Max 40 Max 46.5 Max W D0 P1 t F P0 Straight Leads "LS" P2 P E DP DP DH DH U H1 W0 W2 W1 Ho b W D0 P1 F t P0 Under-crimped Leads "LU" 57 w w w. l i t t e l f u s e . c o m 2 VARISTOR PRODUCTS P2 Varistor Products High Energy Radial Lead C-III Varistor Series Additional Lead Style Options Tape and Reel Data Radial lead types can be supplied with combination preformed crimp and trimmed leads. This option is suppliedto the dimensions shown below. * 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 VARISTOR MODEL SIZE 14mm 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 STRAIGHT LEADS UNDER CRIMP LEADS V130LT20C V130LS20C V130LU20C 20mm SYMBOL 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). Shipping Quantity QUANTITY PER REEL DEVICE SIZE "T"REEL "S"REEL "U"REEL 14mm 500 500 500 20mm 500 500 500 CRIMPED AND TRIMMED LEAD Mechanical Dimensions *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 ORDER AS V130LA20C V130LC20C * For 10 1mm lead spacing on 20mm units only; append standard model numbers by adding "X10" suffix. VARISTOR MODEL SIZE SYMBOL VRMS VOLTAGE MODEL MAX MIN MAX A ALL 13.5 (0.531) 20 (0.787) 17.5 (0.689) 26.5 (1.043) OD ALL 13.5 (0.531) 17 (0.669) 17.5 (0.689) 23 (0.906) e ALL 6.5 (0.256) 8.5 (0.335) e1 130 - 320 2.5 (0.098) 4.5 (0.177) E Ob 130 - 320 ALL 14mm MIN STANDARD MODEL ORDER AS V130LA20C V130LC20C 20mm 6.5 (0.256) 8.5 (0.335) 5.5 (0.216) 2.5 (0.098) 5.5 (0.216) 9.0 (0.354) 4.5 (0.177) 9.0 (0.354) - 7.3 (0.287) - 7.3 (0.287) - 11 (0.433) - 11 (0.433) 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. 2. Parts with rated voltage in excess of 320Vrms AC are available. Contact factory for details. 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. w w w. l i t t e l f u s e . c o m 58 Varistor Products High Energy Radial Lead C-III Varistor Series TEST RESULTS UL 1449 IEEE/ANSI C62.41 9000A (8/20s) 1 Pulse 0/165 IEC 1051 7000A (8/20s) 2 Pulses 0/105 3000A (8/20s) 20 Pulses 0/75 300 V130LA20C 750A (8/20s) 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 0/180 120% Maximum Rated Varistor Voltage For 5 Minutes 0/70 Temporary N/A Overvoltage 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). 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 surge current for the C-III series is 20 pulses for the 20mm units and 10 pulses for the 14mm series. 59 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. VNOM AT 1mA (V) TEST CONDITIONS 250 200 150 100 0 100 200 300 400 500 600 700 TIME (HOURS) 800 900 1000 1100 FIGURE 8. HIGH TEMPERATURE OPERATING LIFE 125 oC FOR 1000 HOURS AT RATED BIAS CLAMPING VOLTAGE AT 3kA Surge Current REFERENCE STANDARD 500 V130LA20C 3kA (8/20s) 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 TEST Additionally, all 20mm C-III devices are listed to the "Permanently Connected" category (10kA) of UL1449, by Underwriter's Laboratories, Inc. 600 V175LA20C 750A (8/20s) 550 500 450 400 350 300 (RATED FOR 80 SURGES) 0 50 100 150 200 250 NUMBER OF SURGES FIGURE 10. TYPICAL REPETITIVE SURGE CURRENT CAPABILITY OF C-III SERIES MOVs w w w. l i t t e l f u s e . c o m 300 2 VARISTOR PRODUCTS TABLE 1.