137 www.littelfuse.com varistor products 2 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 125 o c (ambient) without derating. the ra series are available in voltage ratings up to 275v v m(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 125 o c ambient ?wide operating voltage range v m(ac)rms .....................................4v to 275v v m(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. www..net www..net
138 www.littelfuse.com varistor products ra varistor series absolute maximum ratings for ratings of individual members of a series, see device ratings and specifications chart continuous: steady state applied voltage: ac voltage range (v m(ac)rms ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 275 10to 275 4 to 275 v dc voltage range (v m(dc ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 to 369 14 to 369 18 to 369 v transient: peak pulse current (i tm ) for 8/20? current wave (see figure 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 to1200 1000 to 4500 2000 to 6500 a single pulse energy range ( note 1 ) for 10/1000? current wave (w tm ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.4 to 23 3.5 to 75 70 to 160 j operating ambient temperature range (t a ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 125 -55 to -125 -55 to -125 o c storage temperature range (t stg ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to 150 -55 to 150 -55 to 150 o c temperature coefficient ( v) of clamping voltage (v c ) at specified test current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.0 1 <0.01 <0.01 %/ o c hi-pot encapsulation (isolation voltage capability) (dielectric must withstand indicated dc voltage for one minute per mil-std 202, method 301) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5000 5000 5000 v insulation resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 1000 1000 m ? caution: stresses above those listed in ?bsolute 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) ra8 series ra16 series ra22 series units low profile pa rt number brand maximum ratings (125 o c) specifications (25 o c) continuous transient varistor voltage at 1ma dc test current max clamping voltage v c at test current (8/20 s) typical capaci- tance v rms v dc energy (10/1000 s) peak current (8/20 s) v m(ac) v m(dc) w tm i tm min v n(dc) max v c i p f = 1mhz (v) (v) (j) (a) (v) (v) (v) (v) (a) (pf) ? ra8 series v8ra8 8r 4 5.5 0.4 150 6 8.2 11.2 22 5 3000 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 www..net www..net
139 www.littelfuse.com varistor products 2 varistor products low profile ra varistor series device ratings and specifications (note 1) (continued) ? 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 ? ra16 series 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 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 ? ra22 series 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 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. pa rt number brand maximum ratings (125 o c) specifications (25 o c) continuous transient varistor voltage at 1ma dc test current max clamping voltage v c at test current (8/20 s) typical capaci- tance v rms v dc energy (10/1000 s) peak current (8/20 s) v m(ac) v m(dc) w tm i tm min v n(dc) max v c i p f = 1mhz (v) (v) (j) (a) (v) (v) (v) (v) (a) (pf) www..net www..net
140 www.littelfuse.com varistor products 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 specifi- cations 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. figure 1. current, energy and power derating curve 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 ( o c) percent of rated value 100 90 50 10 o 1 t t 1 t 2 time percent of peak value low profile o 1 = virtual origin of wave t = time from 10% to 90% of peak t 1 = virtual front time = 1.25 ?t t 2 = virtual time to half value (impulse duration) example: for an 8/20 s current waveform: 8 s = t 1 = virtual front time 20 s = t 2 = virtual time to half value figure 2. peak pulse current test waveform www..net www..net
141 www.littelfuse.com varistor products 2 varistor products low profile ra varistor series transient v-i characteristics curves (continued) figure 5. clamping voltage for v18ra16 - v68ra16 600 500 400 300 200 100 90 80 70 60 50 40 30 20 10 -3 10 -2 10 -1 10 0 10 1 10 2 10 3 peak amperes (a) maximum peak volts (v) v68ra16 v56ra16 V47RA16 v39ra16 v33ra16 v27ra16 v22ra16 v18ra16 maximum clamping voltage 18 to 68v n(dc) rating t a = -55 o c to 125 o c figure 3. clamping voltage for v8ra8 - v68ra8 600 500 400 300 200 100 90 80 70 60 50 40 30 20 10 10 -3 10 -2 10 -1 10 0 10 1 10 2 10 3 peak amperes (a) maximum peak volts (v) v68ra8 v56ra8 v47ra8 v39ra8 v33ra8 v27ra8 v22ra8 v18ra8 v12ra8 v8ra8 maximum clamping voltage 8 t o 68v n(dc) rating t a = -55 o c to 125 o c figure 4. clamping voltage for v82ra8 - v430ra8 maximum peak volts (v) peak amperes (a) 10 -2 10 -1 10 0 10 1 10 2 10 3 10 -3 v180ra8 v150ra8 v120ra8 v100ra8 maximum clamping voltage model size 5 x 8mm 82 to 430v n(dc) rating t a = -55 o c to 125 o c 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 10 4 v82ra8 v270ra8 v360ra8 v220ra8 v200ra8 v240ra8 v430ra8 v390ra8 figure 6. clamping voltage for v82ra16 - v430ra16 maximum peak volts (v) peak amperes (a) 10 -2 10 -1 10 0 10 1 10 2 10 3 10 -3 v180ra16 v150ra16 v120ra16 v100ra16 maximum clamping voltage model size 5 x 8mm 82 to 430v n(dc) rating t a = -55 o c to 125 o c 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 10 4 v82ra16 v270ra16 v360ra16 v220ra8 v200ra8 v240ra16 v430ra16 v390ra16 figure 7. clamping voltage for v24ra22 - v36ra22 300 200 100 90 80 70 60 50 40 30 20 maximum peak volts (v) peak amperes (a) 10 -2 10 -1 10 0 10 1 10 2 10 3 10 -3 10 4 v36ra22 v24ra22 maximum clamping voltage 24 to 36v n(dc) rating t a = -55 o c to 125 o c figure 8. clamping voltage for v200ra22 - v430ra22 maximum peak volts (v) peak amperes (a) 10 -2 10 -1 10 0 10 1 10 2 10 3 10 -3 4,000 3,000 2,000 1,000 900 800 700 600 500 400 300 200 100 10 4 maximum clamping voltage 200 to 430v n(dc) rating t a = -55 o c to 125 o c v430ra22 v390ra22 v270ra22 v240ra22 v200ra22 www..net www..net
142 www.littelfuse.com varistor products ra varistor series pulse rating curves (continued) figure 11. surge current rating curves for v82ra8 - v430ra8 figure 12. surge current rating curves for v18ra16 - v68ra16 2,000 1,000 200 100 50 20 10 5 1 2 500 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 10 2 10 4 10 5 10 6 v82ra8 - v430ra8 10 3 indefinite 200 100 50 20 10 5 1 2 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 10 2 10 4 10 5 10 6 v18ra16 - v68ra16 10 3 indefinite 1,000 500 note: if pulse ratings are exceeded, a shift of v n(dc) (at specified current) of more than ?0% could result.this type of shift, which normally results in a decrease of v n(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. low profile figure 9. surge current rating curves for v8ra8 - v12ra8 figure 10. surge current rating curves for v18ra8 - v68ra8 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 10 10 2 v8ra8 - v12ra8 2 10 3 indefinite 10 4 10 5 10 6 200 100 50 20 10 5 2 1 0.5 0.2 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 10 10 2 v18ra8 - v68ra8 2 10 3 indefinite 500 200 100 50 20 10 2 1 0.5 0.2 10 4 10 5 10 6 5 www..net www..net
143 www.littelfuse.com varistor products 2 varistor products figure 13. surge current rating curves for v82ra16 - v430ra16 figure 14. surge current rating curves for v24ra22 - v36ra22 5,000 2,000 200 100 50 20 10 5 2 500 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 10 4 10 5 10 6 v82ra16 - v430ra16 10 3 indefinite 1,000 10 2 2,000 200 100 50 20 10 5 2 500 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 v24ra22 - v36ra22 1,000 10 2 10 3 10 4 10 5 10 6 indefinite low profile ra varistor series figure 15. surge current rating curves for v200ra22 - v430ra22 10,000 2,000 200 100 50 20 10 5 2 500 20 100 1,000 10,000 impulse duration ( s) surge current (a) 1 2 10 4 10 5 10 6 v200ra22 - v430ra22 10 3 indefinite 1,000 10 2 10 5,000 1 pulse rating curves (continued) www..net www..net
144 www.littelfuse.com varistor products low profile ra varistor series mechanical dimensions ordering information the ra series is supplied in bulk pack. d max y n min a max seating plane 5.0 min (0.197 min) b 0.05 ( 0.002) e max e 1.0 ( 0.039) 0.5 max offset (0.020 max) x symbol 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) e5 (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) b 0.635 (0.025) 0.81 (0.032) 0.81 (0.032) weight typ 1 gram 3.4 grams 4.4 grams x2 .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) notes: 5. dimensions in mm, dimensions in inches in parentheses. 6. inches for reference only. v 200 ra 16 relative device size indicator varistor technology series designator nominal varistor voltage www..net www..net
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