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Varistor Products
High Energy Industrial Disc
CA Varistor Series
The CA Series of transient surge suppressors are industrial high-energy disc varistors (MOVs) intended for special applications requiring unique electrical contact or packaging methods provided by the customer. The electrode finish of these devices is solderable and can also be used with pressure contacts. Discs of the same diameter may be stacked. This series of industrial disc varistors are available in three diameter sizes of 32, 40, and 60mm, with disc thicknesses ranging from 1.8mm minimum to 32mm maximum. They offer a wide voltage range of from 250 to 2800 VM(AC)RMS . For information on soldering considerations, refer to AN8820 update. "Recommendations for Soldering Terminal Leads to MOV Varistor Discs".
Features
* Provided In Disc Form For Unique Packaging By Customer * Solderable Electrode Finish Options * Pressure Contacts and/or Disc Stacking May be Utilized * Standard Disc Sizes 32mm, 40mm, and 60mm Diameter * Available Edge Passivation Insulation * Wide Operating Voltage Range VM(AC)RMS 250V to 2800V * High Peak Pulse Current Range . . . . . . . . . . ITM 20,000A to 70,000A * Very High Energy Capability WTM . . . . . . . . . . . . . . .330J to 10,000J * No Derating Up to 85oC Ambient
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Absolute Maximum Ratings
For ratings of individual members of a series, see Device Ratings and Specifications chart
CA SERIES Continuous: Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 to 2800 DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 to 3500 Transient: Peak Pulse Current (ITM) For 8/20s Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20,000 to 70,000 Single Pulse Energy Range For 2ms Current Square Wave (WTM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 330 to 10,000 Operating Ambient Temperature Range (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to 85 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to 85 Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01
UNITS
V V
2
VARISTOR PRODUCTS
A J C O C %OC
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 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
MAXIMUM RATINGS (85 oC) CONTINUOUS TRANSIENT SPECIFICATIONS (25 oC) MAX CLAMPING VOLT V C AT 200A CURRENT (8/20s) VC (V) 350 410 680 650 620 750 730 680 850 830 760 1200 1130 1060 1300 1240 1160 1440 1350 1300 1600 1480 1420 1820 1720 1640
VRMS MODEL NUMBER V131CA32 V151CA32 V251CA32 V251CA40 V251CA60 V271CA32 V271CA40 V271CA60 V321CA32 V321CA40 V321CA60 V421CA32 V421CA40 V421CA60 V481CA32 V481CA40 V481CA60 V511CA32 V511CA40 V511CA60 V571CA32 V571CA40 V571CA60 V661CA32 V661CA40 V661CA60 SIZE (mm) 32 32 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 VM(AC) (V) 130 150 250
VDC VM(DC) (V) 175 200 330
ENERGY (2ms) WTM (J) 200 220 330 370 880 360 400 950 390 460 1100 400 600 1500 450 650 1600 500 700 1800 550 770 2100 600 900 2300
PEAK CURRENT (8/20s) ITM (A) 20000 20000 20000 40000 50000 20000 40000 50000 20000 40000 50000 25000 40000 70000 25000 40000 70000 25000 40000 70000 25000 40000 70000 25000 40000 70000
VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MIN (V) 184 212 354 VN(DC) (V) 200 240 390 MAX (V) 228 268 429
TYPICAL CAPACITANCE f = 1MHz (pF) 4700 4000 2500 5000 10000 2200 4500 9000 1900 3800 7500 1500 3000 6000 1300 2700 5500 1200 2500 5000 1100 2200 4500 1000 2000 4000
275
369
389
430
473
320
420
462
510
561
420
560
610
680
748
480
640
670
750
825
510
675
735
820
910
575
730
805
910
1000
660
850
940
1050
1160
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Device Ratings and Specifications
(continued)
MAXIMUM RATINGS (85 oC) CONTINUOUS TRANSIENT
SPECIFICATIONS (25 oC) MAX CLAMPING VOLT V C AT 200A CURRENT (8/20s) VC (V) 2050 2000 1880 2340 2940 3600 4300 5200 6200 7400
VRMS MODEL NUMBER V751CA32 V751CA40 V751CA60 V881CA60 V112CA60 V142CA60 V172CA60 V202CA60 V242CA60 V282CA60 SIZE (mm) 32 40 60 60 60 60 60 60 60 60 VM(AC) (V) 750
VDC VM(DC) (V) 970
ENERGY (2ms) WTM (J) 700 1050 2600 3200 3800 5000 6000 7500 8600 10000
PEAK CURRENT (8/20s) ITM (A) 25000 40000 70000 70000 70000 70000 70000 70000 70000 70000
VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MIN (V) 1080 VN(DC) (V) 1200 MAX (V) 1320
TYPICAL CAPACITANCE f = 1MHz (pF) 800 1800 3500 2700 2200 1800 1500 1200 1000 800
880 1100 1400 1700 2000 2400 2800
1150 1400 1750 2150 2500 3000 3500
1290 1620 2020 2500 2970 3510 4230
1500 1800 2200 2700 3300 3900 4700
1650 2060 2550 3030 3630 4290 5170
NOTE: Average power dissipation of transients not exceed 1.5W, 2.0W and 2.5W for model 32mm, 40mm and 60mm, respectively. 1. Peak current applies to applications rated up to 115VRMS. Peak Current is 30kA for applications greater than 115VRMS. 2. Peak current applies to applications rated up to 132VRMS. Peak Current is 30kA for applications greater than 132VRMS.
Power Dissipation Ratings
Should transients occur in rapid succession, the average power dissipation result 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. Furthermore, the operating values need to be derated at high temperatures as shown in Figure 1. Because varistors can only dissipate a relatively small amount of average power they are, therefore, not suitable for repetitive applications that involve substantial amounts of average power dissipation.
PERCENT OF PEAK VALUE
100 90
50
100 PERCENT OF RATED VALUE 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150
10 O1 T T1 TIME T2
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 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
AMBIENT TEMPERATURE ( oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Transient V-I Characteristics Curves
6,000 5,000 4,000 MAXIMUM PEAK VOLTS (V) 3,000 2,000 MAXIMUM CLAMPINGVOLTAGE DISC SIZE 32mm 130 TO 750 VM(AC) RATING MAXIMUM PEAK VOLTS (V) TA = -55oC TO 85oC 6,000 5,000 4,000 3,000 MAXIMUM CLAMPINGVOLTAGE DISC SIZE 40mm 130 TO 750 VM(AC) RATING V751CA40 V661CA40 V571CA40 TA = -55oC TO 85oC
V751CA32 V661CA32 V571CA32 1,000 V511CA32 900 V481CA32 800 V421CA32 700 600 V321CA32 500 V271CA32 V251CA32 400 300 V151CA32 V131CA32 200 10-3 10-2 10-1 100 101 102 PEAK AMPERES 103 104 105
V511CA40 V481CA40 2,000 V421CA40
2
VARISTOR PRODUCTS
1,000 900 800 700 600 V321CA40 500 V271CA40
V251CA40
400 300
V151CA40
V131CA40 200 10-1 10-2
100
101 102 PEAK AMPERES
103
104
105
FIGURE 3. CLAMPING VOLTAGE FOR V131CA32 - C751CA32
FIGURE 4. CLAMPING VOLTAGE FOR V131CA40 - V751CA40
6,000 5,000 4,000 MAXIMUM PEAK VOLTS (V) 3,000 2,000
MAX CLAMPING VOLTAGE DISC SIZE 60mm 250 TO 880VM(AC) RATING TA = -55oC TO 85oC
V881CA60 V751CA60 V661CA60 V571CA60
30,000 V511CA60 V481CA60 V421CA60
20,000
MAX CLAMPING VOLTAGE DISC SIZE 60mm 1100 TO 2800VM(AC) RATING TA = -55oC TO 85oC
MAX PEAK VOLTS (V)
1,000 900 800 700 600 V321CA60 500 V271CA60 V251CA60 400 300 200 10-2 10-1 100 101 102 103 PEAK AMPERES (A) 104 105
10,000 9,000 8,000 7,000 6,000
V282CA60
5,000 V242CA60 4,000 V202CA60 3,000 V142CA60
V112CA60 V172CA60
2,000 10-2
10-1
100
101 102 PEAK AMPERES (A)
103
104
105
FIGURE 5. CLAMPING VOLTAGE FOR V251CA60 - V881CA60
FIGURE 6. CLAMPING VOLTAGE FOR V112CA60 - V282CA60
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Pulse Rating Curves
50,000 20,000 10,000 SURGE CURRENT (A) 5,000 2,000 1 2 10 102 105 SURGE CURRENT (A) 106 DISC SIZE 32mm V131CA32 - V321CA32 50,000 20,000 10,000 5,000 10 105 106 1 2 DISC SIZE 32mm V421CA32 - V751CA32
2,000 102 1,000 103 500 104 200 100 50 20 INDEFINITE
1,000 103 500 104 200 100 50 20 10 20 INDEFINITE 100 1,000 IMPULSE DURATION ( s) 10,000
10 20
100
1,000 IMPULSE DURATION ( s)
10,000
FIGURE 7. SURGE CURRENT RATING CURVES FOR V131CA32 - V321CA32
50,000 20,000 1 2 104 105 DISC SIZE 40mm V131CA40 - V751CA40
FIGURE 8. SURGE CURRENT RATING CURVES FOR V421CA32 - V751CA32
50,000 1 20,000 10,000 SURGE CURRENT (A) 5,000 2,000 1,000 500 200 100 106 50 20 10 20 INDEFINITE 100 1,000 IMPULSE DURATION ( s) 10,000 102 103 104 105 10 2 DISC SIZE 60mm V251CA60 - V321CA60
10,000 10 5,000 SURGE CURRENT (A) 2,000 1,000 500 200 100 106 50 20 INDEFINITE 10 20 100 102 103
1,000 IMPULSE DURATION ( s)
10,000
FIGURE 9.
SURGE CURRENT RATING CURVES FOR V131CA40 - V751CA40
100,000 50,000 20,000 10,000 SURGE CURRENT (A) 5,000 2,000 1,000 500 200 100 50 20 10 20 INDEFINITE 106 102 103 104 105 1 10 2
FIGURE 10. SURGE CURRENT RATING CURVES FOR V251CA60 - V321CA60
DISC SIZE 60mm V421CA60 - V282CA60
100 1,000 IMPULSE DURATION ( s)
10,000
FIGURE 11. SURGE CURRENT RATING CURVES FOR V421CA60 - V282CA60
NOTE: If pulse ratings are exceeded, a shift of VN(DC) (at specified current) of more than 10% could result. This type of shift, which normally results in a decrease of VN(DC), may result in the device not meeting the original published specifications, but does not prevent the device from continuing to function, and to provide ample protection. 118
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Series Dimensions
ELECTRODE 2.0 0.25 OPTIONAL PASSIVATION COLLAR
DISC DIAMETER MODEL SIZE 32 40 MILLIMETERS MIN 31.0 38.0 58.0 MAX 33.0 40.0 62.0 MIN 1.220 1.496 2.283 INCHES MAX 1.299 1.575 2.441
2
VARISTOR PRODUCTS
119
ELECTRODE
60
DIAMETER (SEE TABLE)
THICKNESS
THICKNESS (32mm DISC MODELS) MODEL VRMS VM(AC) 130 150 250 275 320 420 480 510 575 660 750 880 1100 1400 1700 2000 2400 2800 MILLIMETERS MIN 1.4 1.7 1.6 1.8 2.1 2.9 3.1 3.5 3.8 4.4 5.1 MAX 2.4 2.8 2.2 2.5 2.9 3.9 4.3 4.7 5.1 6.0 6.9 MIN 0.071 0.083 0.063 0.071 0.083 0.114 0.122 0.138 0.150 0.173 0.240 INCHES MAX 0.094 0.110 0.087 0.098 0.114 0.154 0.169 0.185 0.201 0.236 0.327 -
THICKNESS (40mm AND 60mm DISC MODELS) MILLIMETERS MIN 1.4 1.5 2.0 2.2 2.6 3.5 3.8 4.2 4.6 5.3 6.1 7.3 9.2 11.5 14.0 17.0 20.0 24.0 MAX 2.8 3.0 2.7 3.0 3.5 4.7 5.2 5.7 6.3 7.2 8.3 10.3 13.0 16.0 19.0 22.5 27.0 32.0 MIN 0.055 0.06 0.079 0.087 0.102 0.138 0.150 0.165 0.181 0.209 0.240 0.287 0.362 0.453 0.551 0.669 0.787 0.945 INCHES MAX 0.134 0.150 0.106 0.118 0.138 0.185 0.205 0.224 0.248 0.283 0.327 0.406 0.512 0.630 0.748 0.886 1.063 1.260
Available in 32mm and 40mm only. Available in 60mm size only.
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
MODEL NUMBER V131CA32 V131CA40 V151CA32 V151CA40 V251CA32 V251CA40 V251CA60 V271CA32 V271CA40 V271CA60 V321CA32 V321CA40 V321CA60 V421CA32 V421CA40 V421CA60 V481CA32 V481CA40 V481CA60 V511CA32 V511CA40 V511CA60 V571CA32 V571CA40 V571CA60 V661CA32 V661CA40 V661CA60 V751CA32 V751CA40 V751CA60 V881CA60 V112CA60 V142CA60 V172CA60 V202CA60 V242CA60 V282CA60 SIZE (mm) 32 40 32 40 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 32 40 60 60 60 60 60 60 60 60 TYPICAL DISC WEIGHT (GRAMS) 9 21 11 23 8 17 39 10 18 42 11 22 50 15 28 66 16 31 71 18 35 80 20 38 88 23 44 101 26 51 116 141 178 220 265 317 377 450
0 0 100 200 300 400 500 600 700 800 900 TIME (SEC) TEMPERATURE ( oC) 250
Encapsulated Recommendations
After lead attachment, the disc/lead assembly may be coated or encapsulated in a package to provide electrical insulation and isolation from environmental contamination as required by the application. Coating/Filler materials for containers may include silicones, polyurethanes, and some epoxy resins.Two examples of acceptable polyurethanes are Dexter Hysol (US7013, parts A and B) and Rhenatech (resin 4714, hardener 4900), or their equivalents. Materials containing halogens, sulfides, or alkalines are not recommended.
Electrode Metallization
The standard CA Series is supplied with sintered silver electrodes on CA32 devices and arc-sprayed copper-over-aluminum electrodes for CA40 and CA60 series. CA40 parts are also available with sintered silver electrode, see "Ordering information." In general, when discs are stacked to attain a specific operating voltage or energy capability, the copper finish is typically chosen. Likewise, the copper finish is used with high temperature lead attach soldering operations (wave solder). The silver metallization is typically used for solder reflow lead attach operations (I-R, Vapour-Phase). The recommended temperature profile of a belt-fed convection oven is shown in Figure 13.
200
150
100
50
FIGURE 13. TYPICAL BEL OVEN TEMPERATURE PROFILE T
Stacking and Contact Pressure Recommendations
When applications require the stacking of Littelfuse CA discs or when electrical connection is made by pressure contacts, the minimum pressure applied to the disc electrode surface should be 2.2kGs (5 pounds). The maximum recommended pressure applied to the disc electrode is dependent upon diameter size and is given in the following table.
MODEL SIZE (mm) 32 40 60 MAXIMUM PRESSURE 16N/CM2 (23LBs/IN2) 8N/CM2 (11.5LBs/IN2) 4N/CM2 (5.7LBs/IN2)
Passivation Layer
The standard CA Series is supplied with passivation layer around the outside perimeter of the disc forming an electrical insulator as detailed in the dimensional drawing. The CA Series is also available without a passivation layer for applications where the customer provides a suitable encapsulation or potting material as recommended below. (See Ordering Information.)
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Varistor Products
High Energy Industrial Disc
CA Varistor Series
Ordering Information
The CA Series offers optional electrode finish materials and a glass passivation edge option which must be designated. When ordering, the code letters suffix as shown in the following table must be selected and appended to the standard Model number. NOTES: 1. The 60mm disc types V112CA60 to V282CA60, inclusive, are only supplied with glass passivation and arc-sprayed copper finish electrodes. (That is, with the "PC" option suffix code.) 2. The 32mm size discs are only available with silver metallization. Note also that the CA Series receives no branding on the disc itself.
ELECTRODE MATERIAL Arc-Sprayed Copper Sintered Silver NON-PASSIVATED DISC NC NS PASSIVATED DISC PC PS
2
VARISTOR PRODUCTS
Packaging and Shipping
The CA Series is supplied in bulk for shipment. Discs are packaged in compartmentalized cartons to protect from scratching or edge-chipping during shipment.
V 25 1 CA 40 P S
VARISTOR DESIGNATOR SILVER ELECTRODE OPTION DESIGNATOR
MAX AC RMS WORKING VOLTAGE (FIRST SIGNIFICANT DIGITS) V M(AC)
PASSIVATION OPTION DESIGNATOR
VM(AC) VOLTAGE DECADE MULTIPLIER SERIES DESIGNATOR
DISC SIZE (mm) DIAMETER
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