features surge withstand iec 61000-4-5 1.2/50 ? low thermal resistant ceramic core e24 resistance values rohs compliant* wide power range (1~8 w) coating material meets ul 94v-0 requirements applications smart meters renewable energy industrial power supplies/chargers lighting instruments/gauges white goods ws series high surge withstand wirewound resistor *rohs directive 2002/95/ec jan. 27, 2003 including annex and rohs recast 2011/65/eu june 8, 2011. speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. *rohs compliant electrical characteristics resistance range ................................................ see popular resistance values table power rating @ 70 c ws1m, ws1a ........................................................................................................1 w ws2m, ws2a ........................................................................................................2 w ws3m, ws3a ........................................................................................................3 w ws5m, ws5a ........................................................................................................5 w ws7m, ws7a ........................................................................................................7 w ws8m ....................................................................................................................8 w tolerance ....................................................................................................................5 % operating temperature .........................................................................-55 c to +200 c temperature coef? cient .............................................................................. 200 ppm/c maximum voltage .................................................................................................... p*r physical characteristics resistor .................................................................... low thermal resistant ceramic core lead wire ......................................................................................tin-plated copper wire coating material ............................................................... meets ul 94v-0 requirements environmental characteristics test conditions speci cation short time overload 10 times rated power for 5 seconds. r?(5 % 0.05 ) solderability 245 3 c for 2.5 0.5 seconds. over 95 % coverage resistance to 260 5 c for 10 1 seconds. r?(1 % + 0.05 ) solder heat temperature cycle 5 cycles, -55 c 3 c for 30 minutes, room temperature for r?(2 % + 0.05 ) 15 minutes, +155 2c for 30 minutes, room temperature for 15 minutes dielectric strength test voltage >500 vrms for >1 minute. pass insulation resistance test voltage >500 vrms for 1 minute. >10 9 load life humidity rated continuous voltage for 1000 hours, 1.5 hours on and r (5 % + 0.05 ) 0.5 hours off at 90~95 % relative humidity and test temperature of 40 c 2 c. load life rated continuous voltage for 1000 hours, 1.5 hours on and r?(5 % + 0.05 ) 0.5 hours off at a test temperature of 70 c 2 c. 1000 hours at rated power. surge iec 61000-4-5 1.2/50 s exponential. r (5 % + 0.05 ) popular resistance values code r value 15r0 15 20r0 20 22r0 22 33r0 33 47r0 47 code r value 68r0 68 1500 150 1001 1k 3301 3.3k other e24 resistance values available upon request. how to order ws 3 m 22r0 j product series ws = wirewound, high surge withstand power rating 1 = 1 watt 2 = 2 watts 3 = 3 watts 5 = 5 watts 7 = 7 watts 8 = 8 watts pin style a = axial standard version m = axial miniaturized version resistance code ? r<100 ohms: r represents decimal point (example: 22r0 = 22 ohms) ? r 100 ohms: first three digits are signi? cant, fourth digit represents number of zeros to follow (example: 1001 = 1k ohms) resistance tolerance j = 5 %
speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. users should verify actual device performance in their speci c applications. ws series high surge withstand wirewound resistor typical part marking dimensions: mm (inches) product dimensions wl d t (dia.) w model dimensions l* d w t ws1m 9.5 1.0 (.374 .004) 4.5 1.0 (.177 .004) 28.0 3.0 (1.102 .118) 0.65 0.05 (.026 .002) ws1a 11.5 1.0 (.453 .004) 5.0 1.0 (.197 .004) 28.0 3.0 (1.102 .118) 0.65 0.05 (.026 .002) ws2m 11.5 1.0 (.453 .004) 5.0 1.0 (.197 .004) 28.0 3.0 (1.102 .118) 0.65 0.05 (.026 .002) ws2a 15.5 1.0 (.610 .004) 5.5 1.0 (.217 .004) 28.0 3.0 (1.102 .118) 0.75 0.05 (.030 .002) ws3m 15.5 1.0 (.610 .004) 5.5 1.0 (.217 .004) 28.0 3.0 (1.102 .118) 0.75 0.05 (.030 .002) ws3a 17.5 1.0 (.689 .004) 6.5 1.0 (.256 .004) 28.0 3.0 (1.102 .118) 0.75 0.05 (.030 .002) ws5m 17.5 1.0 (.689 .004) 6.5 1.0 (.256 .004) 28.0 3.0 (1.102 .118) 0.75 0.05 (.030 .002) ws5a 24.5 1.0 (.965 .004) 8.5 1.0 (.335 .004) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002) ws7m 24.5 1.0 (.965 .004) 8.5 1.0 (.335 .004) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002) ws7a 29.5 1.0 (1.161 .004) 8.5 1.0 (.335 .004) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002) ws8m 29.5 1.0 (1.161 .004) 8.5 1.0 (.335 .004) 38.0 3.0 (1.496 .118) 0.75 0.05 (.030 .002) 1st significant figure 2nd significant figure multiplier tolerance power derating curve resistors shall be marked with color coding. colors shall be in accordance with jis c 0802. color 1st band 2nd band multi- plier tol. black 001 brown 1 1 10 1 % red 2 2 100 2 % orange 331k yellow 4 4 10k green 5 5 100k 0.5 % blue 661m 0.25 % violet 7 7 10m 0.10 % grey 8 8 0.05 % white 99 gold 0.1 5 % silver 0.01 10 % 0 -55 0 50 70 100 150 200 250 275 300 20 40 percent rated load (%) ambient temperature (c) 60 80 120 100
3312 - 2 mm smd trimming potentiometer speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. ws series high surge withstand wirewound resistor 08/15 packaging speci cations model o p a b c pkg. style min. order qty. (pcs.) pcs./ box ws1m 58 ?1 (2.283 ?.039) 5 ?0.3 (.197 ?.012) 75 ?5 (2.953 ?.197) 70 ?5 (2.756 ?.197) 255 ?5 (10.039 ?.197) ammo pack 5,000 1,000 ws1a, ws2m 58 ?1 (2.283 ?.039) 5 ?0.3 (.197 ?.012) 80 ?5 (3.150 ?.197) 82 ?5 (3.228 ?.197) 255 ?5 (10.039 ?.197) ws2a, ws3m 65 ?5 (2.559 ?.197) 10 ?0.5 (.394 ?.020) 90 ?5 (3.543 ?.197) 119 ?5 (4.685 ?.197) 255 ?5 (10.039 ?.197) ws3a, ws5m 65 ?5 (2.559 ?.197) 10 ?0.5 (.394 ?.020) 90 ?5 (3.543 ?.197) 88 ?5 (3.465 ?.197) 255 ?5 (10.039 ?.197) 2,000 500 ws5a, ws7m 90 ?5 (3.543 ?.197) 10 ?0.5 (.394 ?.020) 115 ?5 (4.528 ?.197) 124 ?5 (4.882 ?.197) 500 ?5 (19.685 ?.197) dimensions: mm (inches) o l1 l2 z = 1.0 t 61 s t p a c b for ws7a and ws8m packaging speci cations, please contact factory. surge performance - 1.2/50 ? pulse withstanding curve 10 100 1000 10000 pulse voltage (v) value (ohms) 10000 1000 ws1m ws1a, ws2m ws2a, ws3m ws3a, ws5m ws5a, ws7m ws7a, ws8m asia-paci c: tel: +886-2 2562-4117 fax: +886-2 2562-4116 emea: tel: +36 88 520 390 fax: +36 88 520 211 the americas: tel: +1-951 781-5500 fax: +1-951 781-5700 www.bourns.com
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