Copyright © Harris Corporation 1995
SEMICONDUCTOR
4-34
CA Series
Industrial High Energy Metal-Oxide
Disc Varistors
CA SERIES
Description
CA series transient surge suppressors are industrial high-
energy disc varistors intended for special applications requir-
ing unique contact or packaging considerations. The elec-
trode finish of these devices is solderable and can also be
used as pressure contacts for stacking applications.
These CA series industrial disc varistors are available in
three diameter sizes: 32, 40, and 60mm, with disc thick-
nesses ranging from 1.8mm minimum to 32mm maximum.
They offer a wide voltage range of from 130 to 2800
VM(AC)RMS.
For information on mounting considerations refer to Applica-
tions Brief AB-8820.
Absolute Maximum Ratings For ratings of individual members of a series, see Device Ratings and Specifications chart
CA SERIES UNITS
Continuous:
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Voltage Range (VM(DC)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 to 2800
175 to 3500 V
V
Transient:
Peak Pulse Current (ITM)
For 8/20µs Current Wave (See Figure 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Single Pulse Energy Range
For 10/1000µs Current Wave (WTM). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20,000 to 70,000
200 to 10,000
A
J
Operating Ambient Temperature Range (TA). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +85 oC
Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125 oC
Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current. . . . . . . . . . . . . . <0.01 %/oC
March 1995
Features
• Provided Unpackaged For Unique Packaging By Customer
• Solderable Electrode Finish Also Provides Pressure Contacts for
Stacking Applications
• Available Disc Sizes . . . . . . . . . . .32mm, 40mm, and 60mm Diameter
• Wide Operating Voltage Range VM(AC)RMS . . . . . . . . . . 130V to 2800V
• Wide Peak Pulse Current Range ITM . . . . . . . . . . . 20,000A to 70,000A
• Very High Energy Capability WTM . . . . . . . . . . . . . . . . 200J to 10,000J
File Number 2187.3
4-35
Specifications CA Series
Device Ratings and Specifications
MODEL
NUMBER
SIZE
MAXIMUM RATINGS (+85oC) SPECIFICATIONS (+25oC)
CONTINUOUS TRANSIENT
VARISTOR VOLTAGE AT
1mA DC TEST CURRENT
MAX
CLAMPING
VOLT VC
AT 200A
CURRENT
(8/20µs)
TYPICAL
CAPACI-
TANCEVRMS VDC
ENERGY
(2ms)
PEAK
CURRENT
(8/20µs)
VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VCf = 1MHz
(mm) (V) (V) (J) (A) (V) (V) (V) (V) (pF)
V131CA32
V131CA40 32
40 130 175 200
270 20000
30000 184 200 228 350
345 4700
10000
V151CA32
V151CA40 32
40 150 200 220
300 20000
30000 212 240 268 410
405 4000
8000
V251CA32
V251CA40
V251CA60
32
40
60
250 330 330
370
880
20000
30000
50000
354 390 429 680
650
620
2500
5000
10000
V271CA32
V271CA40
V271CA60
32
40
60
275 369 360
400
950
20000
30000
50000
389 430 473 750
730
680
2200
4500
9000
V321CA32
V321CA40
V321CA60
32
40
60
320 420 390
460
1100
20000
30000
50000
462 510 539 850
830
760
1900
3800
7500
V421CA32
V421CA40
V421CA60
32
40
60
420 560 400
600
1500
25000
40000
70000
610 680 748 1200
1130
1060
1500
3000
6000
V481CA32
V481CA40
V481CA60
32
40
60
480 640 450
650
1600
25000
40000
70000
670 750 825 1300
1240
1160
1300
2700
5500
V511CA32
V511CA40
V511CA60
32
40
60
510 675 500
700
1800
25000
40000
70000
735 820 910 1440
1350
1300
1200
2500
5000
V571CA32
V571CA40
V571CA60
32
40
60
575 730 550
770
2100
25000
40000
70000
805 910 1000 1600
1480
1420
1100
2200
4500
V661CA32
V661CA40
V661CA60
32
40
60
660 850 600
900
2300
25000
40000
70000
940 1050 1160 1820
1720
1640
1000
2000
4000
V751CA32
V751CA40
V751CA60
32
40
60
750 970 700
1050
2600
25000
40000
70000
1080 1200 1320 2050
2000
1880
800
1800
3500
V881CA60 60 880 1150 3200 70000 1290 1500 1650 2340 2700
V112CA60
V142CA60
V172CA60
V202CA60
V242CA60
V282CA60
60
60
60
60
60
60
1100
1400
1700
2000
2400
2800
1400
1750
2150
2500
3000
3500
3200
5000
6000
7500
8600
10000
70000
70000
70000
70000
70000
70000
1620
2020
2500
2970
3510
4230
1800
2200
2700
3300
3900
4700
2060
2550
3030
3630
4290
5170
2940
3600
4300
5200
6200
7400
2200
1800
1500
1200
1000
800
NOTE: Average power dissipation of transients not exceed 1.5W, 2.0W and 2.5W for model 32mm, 40mm and 60mm, respectively.
Power Dissipation Ratings
Continuous power dissipation capability is not an applicable
design requirement for a suppressor, unless transients occur
in rapid succession. Under this condition, the average power
dissipation required is simply 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.
4-36
CA Series
FIGURE 1. CURRENT, ENERGY AND POWER DERATING
CURVE FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM
Transient V-I Characteristics Curves
FIGURE 3. CLAMPING VOLTAGE FOR V131CA32 - C751CA32 FIGURE 4. CLAMPING VOLTAGE FOR V131CA40 - V751CA40
FIGURE 5. CLAMPING VOLTAGE FOR V251CA60 - V881CA60 FIGURE 6. CLAMPING VOLTAGE FOR V112CA60 - V282CA60
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
100
90
50
10
O1TT1T2
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
200
6,000
5,000
4,000
3,000
2,000
1,000
900
800
600
400
300
10-3 10-2 10-1 100101102103104
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES
V421CA32
V321CA32
V271CA32
V251CA32
V151CA32
V131CA32
105
500
700
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 32mm
130 TO 750 VM(AC) RATING
V751CA32
V661CA32
V571CA32
V511CA32
V481CA32
TA = -55oC to +85oC
200
6,000
5,000
4,000
3,000
2,000
1,000
900
800
700
600
500
400
300
10-2 10-1 100101102103104105
MAXIMUM CLAMPING VOLTAGE
DISC SIZE 40mm
130 TO 750 V M(AC) RATING
V421CA40
V151CA40
V751CA40
MAXIMUM PEAK VOLTS (V)
PEAK AMPERES
V131CA40
V321CA40
V271CA40
V251CA40
V511CA40
V481CA40 V571CA40
V661CA40
TA = -55oC to +85oC
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
250 TO 880VM(AC) RATING
TA = -55oC TO +85oC
6,000
5,000
4,000
3,000
2,000
1,000
900
800
700
600
500
400
300
200
10-2 10-1 100101102103104105
PEAK AMPERES (A)
V881CA60
V751CA60
V661CA60
V571CA60
MAXIMUM PEAK VOLTS (V)
V511CA60
V481CA60
V421CA60
V321CA60
V271CA60
V251CA60
30,000
20,000
10,000
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
10-2 10-1 100101102103104105
PEAK AMPERES (A)
MAX PEAK VOLTS (V)
V282CA60
V242CA60
V202CA60
V172CA60
V142CA60
V112CA60
MAX CLAMPING VOLTAGE
DISC SIZE 60mm
1100 TO 2800VM(AC) RATING
TA = -55oC TO +85oC
4-37
CA Series
Pulse Rating Curves
FIGURE 7. SURGE CURRENT RATING CURVES FOR
V131CA32 - V321CA32 FIGURE 8. SURGE CURRENT RATING CURVES FOR
V421CA32 - V751CA32
FIGURE 9. SURGE CURRENT RATING CURVES FOR
V131CA40 - V321CA40 FIGURE 10. SURGE CURRENT RATING CURVES FOR
V421CA40 - V751CA40
FIGURE 11. SURGE CURRENT RATING CURVES FOR
V251CA60 - V321CA60 FIGURE 12. 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.
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
IMPULSE DURATION (µs)
20 100 1,000 10,000
SURGE CURRENT (A)
DISC SIZE 32mm
V131CA32 - V321CA32
1
2
10
102
103
104
105
106
INDEFINITE
12
10
102
103
104
INDEFINITE
106
105
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
IMPULSE DURATION (µs)
20 100 1,000 10,000
SURGE CURRENT (A)
DISC SIZE 32mm
V421CA32 - V751CA32
DISC SIZE 40mm
V131CA40 - V321CA40
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10 20 100 1,000 10,000
SURGE CURRENT (A)
IMPULSE DURATION (µs)
2
1
INDEFINITE
102
10
103
104
105
106
DISC SIZE 40mm
V421CA40 - V751CA40
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10 20 100 1,000 10,000
SURGE CURRENT (A)
IMPULSE DURATION (µs)
106
10
2
1
INDEFINITE
104
103
102105
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
IMPULSE DURATION (µs)
1,000 10,000
10
102
103
104
105
INDEFINITE
106
20 100
2DISC SIZE 60mm
V251CA60 - V321CA60
1
SURGE CURRENT (A)
100,000
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
1020 100 1,000 10,000
IMPULSE DURATION (µs)
10
102
103
104
105
106
2
1DISC SIZE 60mm
V421CA60 - V282CA60
INDEFINITE
SURGE CURRENT (A)
4-38
CA Series
VRMS
VM(AC)
THICKNESS (32mm DISC) THICKNESS (40mm AND 60mm DISC)
MILLIMETERS INCHES MILLIMETERS INCHES
MIN MAX MIN MAX MIN MAX MIN MAX
130†1.8 2.4 0.071 0.094 2.5 3.4 0.098 0.134
150†2.1 2.8 0.083 0.110 2.8 3.8 0.110 0.150
250 1.6 2.2 0.063 0.087 2.0 2.7 0.079 0.106
275 1.8 2.5 0.071 0.098 2.2 3.0 0.087 0.118
320 2.1 2.9 0.083 0.114 2.6 3.5 0.102 0.138
420 2.9 3.9 0.114 0.154 3.5 4.7 0.138 0.185
480 3.1 4.3 0.122 0.169 3.8 5.2 0.150 0.205
510 3.5 4.7 0.138 0.185 4.2 5.7 0.165 0.224
575 3.8 5.1 0.150 0.201 4.6 6.3 0.181 0.248
660 4.4 6.0 0.173 0.236 5.3 7.2 0.209 0.283
750 5.1 6.9 0.240 0.327 6.1 8.3 0.240 0.327
880†† - - - - 7.3 10.3 0.287 0.406
1100†† - - - - 9.2 13.0 0.362 0.512
1400†† - - - - 11.5 16.0 0.453 0.630
1700†† - - - - 14.0 19.0 0.551 0.748
2000†† - - - - 17.0 22.5 0.669 0.886
2400†† - - - - 20.0 27.0 0.787 1.063
2800†† - - - - 24.0 32.0 0.945 1.260
†Available in 60mm size only.
†† Available in 32mm and 40mm only.
NOTE: Parts available with soldered tabs, to customer specific requirements or standard design.
Series Dimensions
2.0
0.25
DIAMETER
(SEE TABLE)
PASSIVATION
COLLAR
ELECTRODE
THICKNESS
ELECTRODE
DISC DIAMETER
NOMINAL
SIZE
MILLIMETERS INCHES
MIN MAX MIN MAX
32 31.0 33.0 1.220 1.299
40 38.0 40.0 1.496 1.575
60 58.0 62.0 2.283 2.441
