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. 2 VARISTOR PRODUCTS 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. 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. w w w. l i t t e l f u s e . c o m 137 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 8/20µs Current Wave (See Figure 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 to1200 Single Pulse Energy Range (Note 1) For 10/1000µs Current Wave (WTM ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 to 23 Operating Ambient Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 Storage Temperature Range (TSTG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150 Temperature Coefficient (αV) of Clamping Voltage (VC) at Specified Test Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.01 Hi-Pot Encapsulation (Isolation Voltage Capability) RA16 SERIES RA22 SERIES UNITS 10to 275 14 to 369 4 to 275 18 to 369 V V 1000 to 4500 2000 to 6500 A 3.5 to 75 -55 to -125 -55 to 150 70 to 160 -55 to -125 -55 to 150 <0.01 <0.01 %/OC 5000 1000 5000 1000 V MΩ (Dielectric must withstand indicated DC voltage for one minute per MIL-STD 202, Method 301) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 Insulation Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 J C O C 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 (Note 1) MAXIMUM RATINGS (125 oC) CONTINUOUS PART NUMBER † 138 BRAND SPECIFICATIONS (25 oC) TRANSIENT PEAK CURRENT (8/20µs) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLTAGE V C AT TEST CURRENT (8/20µs) TYPICAL CAPACITANCE VRMS VDC ENERGY (10/1000µs) VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VC IP f = 1MHz (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF) 3000 RA8 SERIES V8RA8 8R 4 5.5 0.4 150 6 8.2 11.2 22 5 V12RA8 12R 6 8 0.6 150 9 12 16 34 5 2500 V18RA8 18R 10 14 0.8 250 14.4 18 21.6 42 5 2000 V22RA8 22R 14 18 (Note 3) 10 (Note 2) 250 18.7 22 26 47 5 1600 V27RA8 27R 17 22 1.0 250 23 27 31.1 57 5 1300 V33RA8 33R 20 26 1.2 250 29.5 33 36.5 68 5 1100 V39RA8 39R 25 31 1.5 250 35 39 43 79 5 900 V47RA8 47R 30 38 1.8 250 42 47 52 92 5 800 V56RA8 56R 35 45 2.3 250 50 56 62 107 5 700 V68RA8 68R 40 56 3.0 250 61 68 75 127 5 600 V82RA8 82R 50 66 4.0 1200 74 82 91 135 10 500 V100RA8 100R 60 81 5.0 1200 90 100 110 165 10 400 V120RA8 120R 75 102 6.0 1200 108 120 132 205 10 300 V150RA8 150R 95 127 8.0 1200 135 150 165 250 10 250 V180RA8 180R 115 153 10.0 1200 162 180 198 295 10 200 V200RA8 200R 130 175 11.0 1200 184 200 228 340 10 180 † † † V220RA8 220R 140 180 12.0 1200 198 220 242 360 10 160 V240RA8 240R 150 200 13.0 1200 212 240 268 395 10 150 V270RA8 270R 175 225 15.0 1200 247 270 303 455 10 130 † V360RA8 360R 230 300 20.0 1200 324 360 396 595 10 100 w w w. l i t t e l f u s e . c o m Varistor Products Low Profile RA Varistor Series (Note 1) (Continued) MAXIMUM RATINGS (125 oC) CONTINUOUS † † † † † † † † † † † † † TRANSIENT VRMS VDC ENERGY (10/1000µs) PEAK CURRENT (8/20µs) VARISTOR VOLTAGE AT 1mA DC TEST CURRENT MAX CLAMPING VOLTAGE V C AT TEST CURRENT (8/20µs) TYPICAL CAPACITANCE VM(AC) VM(DC) WTM ITM MIN VN(DC) MAX VC IP f = 1MHz BRAND (V) (V) (J) (A) (V) (V) (V) (V) (A) (pF) V390RA8 390R 250 330 21.0 1200 354 390 429 650 10 90 V430RA8 430R 275 369 23.0 1200 389 430 473 710 10 80 V18RA16 18R16 10 14 3.5 1000 14.4 18 21.6 39 10 11000 V22RA16 22R16 14 18 (Note 3) 50 (Note 2) 1000 18.7 22 26 43 10 9000 V27RA16 27R16 17 22 5.0 1000 23 27 31.1 53 10 7000 V33RA16 33R16 20 26 6.0 1000 29.5 33 36.5 64 10 6000 V39RA16 39R16 25 31 7.2 1000 35 39 43 76 10 5000 V47RA16 47R16 30 38 8.8 1000 42 47 52 89 10 4500 V56RA16 56R16 35 45 10.0 1000 50 56 62 103 10 3900 V68RA16 68R16 40 56 13.0 1000 61 68 75 123 10 3300 PART NUMBER † † † SPECIFICATIONS (25 oC) 2 VARISTOR PRODUCTS Device Ratings and Specifications RA16 SERIES V82RA16 82R16 50 66 15.0 4500 74 82 91 145 50 2500 V100RA16 100R16 60 81 20.0 4500 90 100 110 175 50 2000 V120RA16 120R16 75 102 22.0 4500 108 120 132 205 50 1700 V150RA16 150R16 95 127 30.0 4500 135 150 165 255 50 1400 V180RA16 180R16 115 153 35.0 4500 162 180 198 300 50 1100 V200RA16 200R16 130 175 38.0 4500 184 200 228 340 50 1000 V220RA16 220R16 140 180 42.0 4500 198 220 242 360 50 900 V240RA16 240R16 150 200 45.0 4500 212 240 268 395 50 800 V270RA16 270R16 175 225 55.0 4500 247 270 303 455 50 700 V360RA16 360R16 230 300 70.0 4500 324 360 396 595 50 550 V390RA16 390R16 250 330 72.0 4500 354 390 429 650 50 500 V430RA16 430R16 275 369 75.0 4500 389 430 473 710 50 450 V24RA22 24R22 14 18 (Note 3) 100.0 (Note 2) 2000 19.2 24 (Note 4) 26 43 20 18000 V36RA22 36R22 23 31 160.0 (Note 2) 2000 32 36 (Note 4) 40 63 20 12000 V200RA22 200R22 130 175 70.0 6500 184 200 228 340 100 1900 V240RA22 240R22 150 200 80.0 6500 212 240 268 395 100 1600 V270RA22 270R22 175 225 90.0 6500 247 270 303 455 100 1400 V390RA22 390R22 250 330 130.0 6500 354 390 429 650 100 1000 V430RA22 430R22 275 369 140.0 6500 389 430 473 710 100 900 RA22 SERIES 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. w w w. l i t t e l f u s e . c o m 139 Varistor Products Low Profile RA Varistor Series Power Dissipation Ratings 100 PERCENT OF RATED VALUE 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. 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 PEAK VALUE FIGURE 1. CURRENT, ENERGY AND POWER DERATING CURVE 100 90 50 10 O1 T TIME T1 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 T2 FIGURE 2. PEAK PULSE CURRENT TEST WAVEFORM 140 w w w. l i t t e l f u s e . c o m Varistor Products Low Profile RA Varistor Series Transient V-I Characteristics Curves (Continued) 4,000 MAXIMUM CLAMPING VOLTAGE 8 TO 68VN(DC) RATING TA = -55oC TO 125oC 3,000 2,000 MAXIMUM PEAK VOLTS (V) MAXIMUM PEAK VOLTS (V) 300 200 100 90 80 70 60 50 40 V68RA8 V56RA8 V47RA8 V39RA8 V33RA8 V27RA8 30 V22RA8 V18RA8 20 V12RA8 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 82 TO 430VN(DC) RATING TA = -55oC TO 125oC 1,000 900 800 700 600 500 V360RA8 400 V270RA8 300 V180RA8 V150RA8 V120RA8 V100RA8 100 10-3 10-2 200 V82RA8 10-1 V8RA8 10 10-3 2 V240RA8 V220RA8 V200RA8 V430RA8 V390RA8 VARISTOR PRODUCTS 600 500 400 10-2 10-1 100 101 102 103 100 101 102 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 4,000 MAXIMUM CLAMPING VOLTAGE 18 TO 68VN(DC) RATING TA = -55oC TO 125oC 3,000 MAXIMUM PEAK VOLTS (V) 2,000 200 100 90 80 70 60 50 40 V68RA16 V56RA16 V47RA16 V39RA16 V33RA16 V27RA16 30 V22RA16 V18RA16 20 10-3 10-2 10-1 100 101 PEAK AMPERES (A) 102 103 200 V82RA16 10-1 100 101 102 103 104 FIGURE 6. CLAMPING VOLTAGE FOR V82RA16 - V430RA16 4,000 MAXIMUM CLAMPING VOLTAGE 24 TO 36VN(DC) RATING TA = -55oC TO 125oC 100 90 80 70 60 3,000 2,000 V36RA22 50 40 V24RA22 30 20 10-3 V180RA16 V150RA16 V120RA16 V100RA16 100 10-3 10-2 V430RA16 V390RA16 PEAK AMPERES (A) MAXIMUM PEAK VOLTS (V) 300 1,000 900 800 700 600 500 V360RA16 400 V270RA16 300 V240RA16 V220RA8 V200RA8 200 FIGURE 5. CLAMPING VOLTAGE FOR V18RA16 - V68RA16 MAXIMUM PEAK VOLTS (V) MAXIMUM PEAK VOLTS (V) 300 MAXIMUM CLAMPING VOLTAGE MODEL SIZE 5 x 8mm 82 TO 430VN(DC) RATING TA = -55oC TO 125oC 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 104 FIGURE 7. CLAMPING VOLTAGE FOR V24RA22 - V36RA22 w w w. l i t t e l f u s e . c o m MAXIMUM CLAMPING VOLTAGE 200 TO 430VN(DC) RATING TA = -55oC TO 125oC V430RA22 V390RA22 1,000 900 800 700 600 500 400 300 V270RA22 V240RA22 V200RA22 200 100 10-3 10-2 10-1 100 101 102 PEAK AMPERES (A) 103 104 FIGURE 8. CLAMPING VOLTAGE FOR V200RA22 - V430RA22 141 Varistor Products Low Profile RA Varistor Series Pulse Rating Curves (Continued) 500 200 V8RA8 - V12RA8 1 100 2 SURGE CURRENT (A) 200 102 20 103 10 5 2 1 102 50 103 20 10 5 2 INDEFINITE 0.5 20 100 1,000 IMPULSE DURATION ( µs) 20 100 1,000 1 2 V82RA8 - V430RA8 1,000 500 2 103 104 105 106 10 102 100 SURGE CURRENT (A) 500 50 20 10 5 1 103 104 105 106 10 200 102 10,000 V18RA16 - V68RA16 100 50 20 10 5 INDEFINITE 2 1 20 1,000 IMPULSE DURATION ( µs) FIGURE 10. SURGE CURRENT RATING CURVES FOR V18RA8 - V68RA8 2,000 200 0.2 10,000 FIGURE 9. SURGE CURRENT RATING CURVES FOR V8RA8 - V12RA8 SURGE CURRENT (A) 10 104 5 10 6 10 1 INDEFINITE 0.5 0.2 2 100 SURGE CURRENT (A) 10 50 V18RA8 - V68RA8 1 104 5 10 6 10 INDEFINITE 2 100 1,000 10,000 1 20 IMPULSE DURATION ( µs) FIGURE 11. SURGE CURRENT RATING CURVES FOR V82RA8 - V430RA8 100 1,000 IMPULSE DURATION ( µs) 10,000 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 w w w. l i t t e l f u s e . c o m Varistor Products Low Profile RA Varistor Series Pulse Rating Curves (Continued) 2 2,000 2,000 2 1,000 10 2 V82RA16 - V430RA16 1,000 102 3 10 104 105 106 500 200 100 50 20 10 V24RA22 - V36RA22 10 500 102 200 103 100 104 50 105 106 20 10 INDEFINITE INDEFINITE 5 5 2 20 1 VARISTOR PRODUCTS 1 SURGE CURRENT (A) SURGE CURRENT (A) 5,000 100 1,000 2 20 10,000 FIGURE 13. SURGE CURRENT RATING CURVES FOR V82RA16 - V430RA16 10,000 1 5,000 1,000 10,000 FIGURE 14. SURGE CURRENT RATING CURVES FOR V24RA22 - V36RA22 2 V200RA22 - V430RA22 10 2,000 SURGE CURRENT (A) 100 IMPULSE DURATION ( µs) IMPULSE DURATION ( µs) 102 103 104 105 106 1,000 500 200 100 50 20 INDEFINITE 10 5 2 1 20 100 1,000 IMPULSE DURATION ( µs) 10,000 FIGURE 15. SURGE CURRENT RATING CURVES FOR V200RA22 - V430RA22 w w w. l i t t e l f u s e . c o m 143 Varistor Products Low Profile RA Varistor Series Mechanical Dimensions Y n MIN RA8 SERIES RA16 SERIES RA22 SERIES A MAX 8.85 (0.348) 15.1 (0.594) 19.1 (0.752) D MAX 11.45 (0.450) 19.7 (0.776) 25.5 (1.004) e 5 (0.197) 7.5 (0.295) 7.5 (0.295) E MAX 5.2 (0.205) 6.3 (0.248) 6.3 (0.248) n MAX 0.7 (0.027) 0.7 (0.027) 0.7 (0.027) Øb 0.635 (0.025) 0.81 (0.032) 0.81 (0.032) WEIGHT TYP 1 Gram 3.4 Grams 4.4 Grams X 2.2 (0.087) 2.2 (0.087) 4.4 (0.173) Y 3.1 ± 0.5 (0.122 ± 0.02) 6±1 (0.236 ± 0.04) 8.9 ± 1 (0.35 ± 0.04) SYMBOL D MAX A MAX SEATING PLANE 5.0 MIN (0.197 MIN) X Øb ± 0.05 (± 0.002) E MAX 0.5 MAX OFFSET (0.020 MAX) e ± 1.0 (± 0.039) 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 Varistor Technology Nominal Varistor Voltage 144 200 RA 16 Relative Device Size Indicator Series Designator w w w. l i t t e l f u s e . c o m