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Varistor Products
Low Profile
RA Varistor Series
The RA Series transient surge suppressors are varistors (MOVs) supplied in a low-profile box that features a precise seating plane to increase mechanical stability for secure circuit-board mounting. This feature makes these devices suitable for industrial applications critical to vibration. Their construction permits operation up to 125oC (ambient) without derating. The RA series are available in voltage ratings up to 275V VM(AC)RMS, and energy levels up to 140J. These varistors are used in automotive, motor-control, telecommunication, and military applications. See RA Series Device Ratings and Specifications table for part number and brand information.
(R)
(R)
2
VARISTOR PRODUCTS
137
Features
* Low Profile Outline with Precise Seating Plane * No Derating up to 125oC Ambient * Wide Operating Voltage Range VM(AC)RMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4V to 275V VM(DC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5V to 369V * High Energy Absorption Capability W TM . . . . . . . . . . . . . up to 140J * 3 Model Sizes Available . . . . . . . . . RA8, RA16, and RA22 * In-Line Leads
AGENCY APPROVALS: Recognized under the components program of Underwriters Laboratories. Certified by CSA. AGENCY FILE NUMBERS: UL E75961, E56529, E135010;
CSA LR91788.
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Varistor Products
Low Profile
RA Varistor Series
Absolute Maximum Ratings
For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous: RA8 SERIES Steady State Applied Voltage: AC Voltage Range (VM(AC)RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 275 DC Voltage Range (VM(DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 to 369 Transient: Peak Pulse Current (ITM) For 8/20s Current Wave (See Figure 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 to1200 Single Pulse Energy Range (Note 1) For 10/1000s Current Wave (WTM ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 to 23 Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150 Temperature Coefficient (V) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 Hi-Pot Encapsulation (Isolation Voltage Capability)
(Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000
RA16 SERIES
10to 275 14 to 369
RA22 SERIES
4 to 275 18 to 369
UNITS
V V
1000 to 4500 3.5 to 75 -55 to -125 -55 to 150 <0.01
2000 to 6500 70 to 160 -55 to -125 -55 to 150 <0.01
A J C O C
O
%/OC
Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000
5000 1000
5000 1000
V M
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
(Note 1)
MAXIMUM RATINGS (125 oC) CONTINUOUS TRANSIENT ENERGY (10/1000s) WTM (J) PEAK CURRENT (8/20s) ITM (A)
SPECIFICATIONS (25 oC) MAX CLAMPING VOLTAGE V C AT TEST CURRENT (8/20s) VC (V) IP (A)
VRMS PART NUMBER VM(AC) BRAND (V)
VDC VM(DC) (V)
VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MIN (V) VN(DC) (V) MAX (V)
TYPICAL CAPACITANCE f = 1MHz (pF)
RA8 SERIES V8RA8 V12RA8 V18RA8 V22RA8 V27RA8 V33RA8 V39RA8 V47RA8 V56RA8 V68RA8 V82RA8 V100RA8 V120RA8 V150RA8 V180RA8 V200RA8 8R 12R 18R 22R 27R 33R 39R 47R 56R 68R 82R 100R 120R 150R 180R 200R 220R 240R 270R 360R 4 6 10 14 17 20 25 30 35 40 50 60 75 95 115 130 140 150 175 230 5.5 8 14 18 (Note 3) 22 26 31 38 45 56 66 81 102 127 153 175 180 200 225 300 0.4 0.6 0.8 10 (Note 2) 1.0 1.2 1.5 1.8 2.3 3.0 4.0 5.0 6.0 8.0 10.0 11.0 12.0 13.0 15.0 20.0 150 150 250 250 250 250 250 250 250 250 1200 1200 1200 1200 1200 1200 1200 1200 1200 1200 6 9 14.4 18.7 23 29.5 35 42 50 61 74 90 108 135 162 184 198 212 247 324 8.2 12 18 22 27 33 39 47 56 68 82 100 120 150 180 200 220 240 270 360 11.2 16 21.6 26 31.1 36.5 43 52 62 75 91 110 132 165 198 228 242 268 303 396 22 34 42 47 57 68 79 92 107 127 135 165 205 250 295 340 360 395 455 595 5 5 5 5 5 5 5 5 5 5 10 10 10 10 10 10 10 10 10 10 3000 2500 2000 1600 1300 1100 900 800 700 600 500 400 300 250 200 180 160 150 130 100

138
V220RA8 V240RA8 V270RA8 V360RA8
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Varistor Products
Low Profile
RA Varistor Series
Device Ratings and Specifications
(Note 1) (Continued)
MAXIMUM RATINGS (125 oC) CONTINUOUS TRANSIENT ENERGY (10/1000s) WTM (J) 21.0 23.0 PEAK CURRENT (8/20s) ITM (A) 1200 1200
SPECIFICATIONS (25 oC) MAX CLAMPING VOLTAGE V C AT TEST CURRENT (8/20s) VC (V) 650 710 IP (A) 10 10
VRMS PART NUMBER VM(AC) BRAND 390R 430R (V) 250 275
VDC VM(DC) (V) 330 369
VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MIN (V) 354 389 VN(DC) (V) 390 430 MAX (V) 429 473
TYPICAL CAPACITANCE f = 1MHz (pF) 90 80
2
VARISTOR PRODUCTS
139

V390RA8 V430RA8 RA16 SERIES V18RA16 V22RA16 V27RA16 V33RA16 V39RA16 V47RA16 V56RA16 V68RA16 V82RA16 V100RA16 V120RA16 V150RA16 V180RA16
18R16 22R16 27R16 33R16 39R16 47R16 56R16 68R16 82R16 100R16 120R16 150R16 180R16 200R16 220R16 240R16 270R16 360R16 390R16 430R16
10 14 17 20 25 30 35 40 50 60 75 95 115 130 140 150 175 230 250 275
14 18 (Note 3) 22 26 31 38 45 56 66 81 102 127 153 175 180 200 225 300 330 369
3.5 50 (Note 2) 5.0 6.0 7.2 8.8 10.0 13.0 15.0 20.0 22.0 30.0 35.0 38.0 42.0 45.0 55.0 70.0 72.0 75.0
1000 1000 1000 1000 1000 1000 1000 1000 4500 4500 4500 4500 4500 4500 4500 4500 4500 4500 4500 4500
14.4 18.7 23 29.5 35 42 50 61 74 90 108 135 162 184 198 212 247 324 354 389
18 22 27 33 39 47 56 68 82 100 120 150 180 200 220 240 270 360 390 430
21.6 26 31.1 36.5 43 52 62 75 91 110 132 165 198 228 242 268 303 396 429 473
39 43 53 64 76 89 103 123 145 175 205 255 300 340 360 395 455 595 650 710
10 10 10 10 10 10 10 10 50 50 50 50 50 50 50 50 50 50 50 50
11000 9000 7000 6000 5000 4500 3900 3300 2500 2000 1700 1400 1100 1000 900 800 700 550 500 450

V200RA16 V220RA16 V240RA16 V270RA16 V360RA16 V390RA16 V430RA16 RA22 SERIES V24RA22 V36RA22
24R22 36R22 200R22 240R22 270R22 390R22 430R22
14 23 130 150 175 250 275
18 (Note 3) 31 175 200 225 330 369
100.0 (Note 2) 160.0 (Note 2) 70.0 80.0 90.0 130.0 140.0
2000 2000 6500 6500 6500 6500 6500
19.2 32 184 212 247 354 389
24 (Note 4) 36 (Note 4) 200 240 270 390 430
26 40 228 268 303 429 473
43 63 340 395 455 650 710
20 20 100 100 100 100 100
18000 12000 1900 1600 1400 1000 900

V200RA22 V240RA22 V270RA22 V390RA22 V430RA22 NOTES:
1. Average power dissipation of transients not to exceed 0.25W for RA8 Series, 0.60W for RA16 Series, or 1.0W for RA22 Series. 2. Energy ratings for impulse duration of 30ms minimum to one half of peak current value. 3. Also rated to withstand 24V for 5 minutes. 4. 10mA DC Test Current.
Under UL File No. E75961 as a recognized component. CSA approved File No. LR91788.
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Varistor Products
Low Profile
RA Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, 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.
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
AMBIENT TEMPERATURE ( oC)
FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE
PERCENT OF PEAK VALUE
100 90
50
10 O1 T T1 T2 TIME
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
140
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Varistor Products
Low Profile
RA Varistor Series
Transient V-I Characteristics Curves (Continued)
600 500 400 300 MAXIMUM PEAK VOLTS (V) MAXIMUM PEAK VOLTS (V) 200 MAXIMUM CLAMPING VOLTAGE 8 TO 68VN(DC) RATING TA = -55oC TO 125oC 4,000 3,000 2,000 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 82 TO 430VN(DC) RATING TA = -55oC TO 125oC V240RA8 V220RA8 V200RA8
2
VARISTOR PRODUCTS
100 90 80 70 60 50 40
V68RA8 V56RA8 V47RA8 V39RA8 V33RA8 V27RA8 30 V22RA8 V18RA8 20 V12RA8 V8RA8 10 10-3 10-2 10-1 100 101 102 103
1,000 900 800 700 600 500 V360RA8 400 V270RA8 300 200 V180RA8 V150RA8 V120RA8 V100RA8 100 10-3 10-2
V430RA8 V390RA8
V82RA8 10-1 100 101 102 PEAK AMPERES (A) 103 104
FIGURE 4. CLAMPING VOLTAGE FOR V82RA8 - V430RA8
PEAK AMPERES (A)
FIGURE 3. CLAMPING VOLTAGE FOR V8RA8 - V68RA8
600 500 400 300 MAXIMUM PEAK VOLTS (V) MAXIMUM PEAK VOLTS (V) 200 MAXIMUM CLAMPING VOLTAGE 18 TO 68VN(DC) RATING TA = -55oC TO 125oC 4,000 3,000 2,000 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 82 TO 430VN(DC) RATING TA = -55oC TO 125oC V240RA16 V220RA8 V200RA8
100 90 80 70 60 50 40
V68RA16 V56RA16 V47RA16 V39RA16 V33RA16 V27RA16 30 V22RA16 V18RA16 20 10-3 10-2
1,000 900 800 700 600 500 V360RA16 400 V270RA16 300 200 V180RA16 V150RA16 V120RA16 V100RA16 100 10-3 10-2
V430RA16 V390RA16
V82RA16 10-1 100 101 102 103 104
10-1 100 101 PEAK AMPERES (A)
102
103
PEAK AMPERES (A)
FIGURE 5. CLAMPING VOLTAGE FOR V18RA16 - V68RA16
300 200 MAXIMUM PEAK VOLTS (V)
FIGURE 6. CLAMPING VOLTAGE FOR V82RA16 - V430RA16
4,000 MAXIMUM CLAMPING VOLTAGE 200 TO 430VN(DC) RATING TA = -55oC TO 125oC
MAXIMUM CLAMPING VOLTAGE 24 TO 36VN(DC) RATING TA = -55oC TO 125oC MAXIMUM PEAK VOLTS (V)
3,000 2,000
100 90 80 70 60 50 40 30 20 10-3
V36RA22
1,000 900 800 700 600 500 400 300 200
V430RA22 V390RA22
V24RA22
V270RA22 V240RA22 V200RA22
10-2
10-1
100 101 102 PEAK AMPERES (A)
103
104
100 10-3
10-2
10-1
100 101 102 PEAK AMPERES (A)
103
104
FIGURE 7. CLAMPING VOLTAGE FOR V24RA22 - V36RA22
FIGURE 8. CLAMPING VOLTAGE FOR V200RA22 - V430RA22
141
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Varistor Products
Low Profile
RA Varistor Series
Pulse Rating Curves (Continued)
200 1 100 50 SURGE CURRENT (A) 20 103 10 5 10 102 2 104 5 10 6 10 SURGE CURRENT (A) V8RA8 - V12RA8
500 1 200 100 50 20 10 5 2 1 0.5 0.2 INDEFINITE 10 102 103 2 V18RA8 - V68RA8 104 5 10 6 10
2 1 0.5 0.2 INDEFINITE
20
100
1,000 IMPULSE DURATION ( s)
10,000
20
100
1,000 IMPULSE DURATION ( s)
10,000
FIGURE 9. SURGE CURRENT RATING CURVES FOR V8RA8 - V12RA8
FIGURE 10. SURGE CURRENT RATING CURVES FOR V18RA8 - V68RA8
2,000 1 1,000 500 SURGE CURRENT (A) 200 100 50 20 10 5 2 1 20 100 1,000 IMPULSE DURATION ( s) 10,000 INDEFINITE 2 10 102 V82RA8 - V430RA8
1,000 2 500 10
1
SURGE CURRENT (A)
103 104 105 106
200 102 100 50 20 10 5 2 1 20 100 INDEFINITE
103 104 105 106
V18RA16 - V68RA16
1,000 IMPULSE DURATION ( s)
10,000
FIGURE 11. SURGE CURRENT RATING CURVES FOR V82RA8 - V430RA8
FIGURE 12. SURGE CURRENT RATING CURVES FOR V18RA16 - V68RA16
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 it does not prevent the device from continuing to function, and to provide ample protection. 142
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Varistor Products
Low Profile
RA Varistor Series
Pulse Rating Curves (Continued)
2
5,000 2,000 1,000 SURGE CURRENT (A) 500 200 100 50 20 10 5 2 20 INDEFINITE 2 10 102 3 10 104 105 106 1 2,000 V82RA16 - V430RA16 1,000 500 SURGE CURRENT (A) 200 100 50 20 10 5 2 20 INDEFINITE 2 10 102 103 104 105 106 1 V24RA22 - V36RA22
100
1,000
10,000
100
1,000 IMPULSE DURATION ( s)
10,000
IMPULSE DURATION ( s)
FIGURE 13. SURGE CURRENT RATING CURVES FOR V82RA16 - V430RA16
FIGURE 14. SURGE CURRENT RATING CURVES FOR V24RA22 - V36RA22
10,000 5,000 2,000 SURGE CURRENT (A) 1,000 500 200 100 50 20 10 5 2 1 20
1
2
V200RA22 - V430RA22 10 102 103 104 105 106
INDEFINITE
100
1,000 IMPULSE DURATION ( s)
10,000
FIGURE 15. SURGE CURRENT RATING CURVES FOR V200RA22 - V430RA22
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143
VARISTOR PRODUCTS
Varistor Products
Low Profile
RA Varistor Series
Mechanical Dimensions
D MAX Y n MIN
SYMBOL A MAX D MAX e
RA8 SERIES 8.85 (0.348) 11.45 (0.450) 5 (0.197) 5.2 (0.205) 0.7 (0.027) 0.635 (0.025) 1 Gram 2 .2 (0.087) 3.1 0.5 (0.122 0.02)
RA16 SERIES 15.1 (0.594) 19.7 (0.776) 7.5 (0.295) 6.3 (0.248) 0.7 (0.027) 0.81 (0.032) 3.4 Grams 2.2 (0.087) 61 (0.236 0.04)
RA22 SERIES 19.1 (0.752) 25.5 (1.004) 7.5 (0.295) 6.3 (0.248) 0.7 (0.027) 0.81 (0.032) 4.4 Grams 4.4 (0.173) 8.9 1 (0.35 0.04)
A MAX SEATING PLANE
X Ob 0.05 ( 0.002)
5.0 MIN (0.197 MIN)
E MAX n MAX Ob
0.5 MAX OFFSET (0.020 MAX)
E MAX
e
1.0 ( 0.039)
WEIGHT TYP X Y NOTES:
5. Dimensions in mm, dimensions in inches in parentheses. 6. Inches for reference only.
Ordering Information
The RA Series is supplied in bulk pack.
V
200
RA
16
Varistor Technology
Relative Device Size Indicator
Nominal Varistor Voltage
Series Designator
144
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