features to-220 housing low inductance ceramic backplane high power rating rohs compliant* applications power supplies motor drives test and measurement recti ers electrical & thermal characteristics pwr221t-30 series power resistor *rohs directive 2002/95/ec jan 27 2003 including annex. speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. general information bourns ? pwr221t-30 series is a to-220 style power resistor made using thick ? lm on alumina ceramic technology. it is used in current limiting, capacitor discharge or current measurement circuits in power supplies for telecom and industrial applications . parameter value(s) resistance (see table of standard values) 0.02 to 130 k power rating @ 25 ?c case temperature 30 w** tolerance 1 %***, 5 % tcr 0.100 speci cations are subject to change without notice. customers should verify actual device performance in their speci c applications. pwr221t-30 series power resistor 06/10 pulse power rating the energy absorbed by the resistor expressed in joules can be calculated by multiplying the peak power of the pulse in watts times the length of the pulse in seconds. the energy should not exceed the limits shown in the graph. the overload voltage should not exceed 1.5 times the maximum operating voltage. product dimensions 10.41 ?0.25 (.410 ?.010) c l 8.38 ?0.25 (.330 ?.010) ceramic 3.18 ?0.1 (.125 ?.004) dia. 1.38 ?0.25 (.054 ?.010) 3.18 ?0.25 (.125 ?.010) 3.18 ?0.25 (.125 ?.010) 2.92 (.115 cer a 2.54 ?0.25 (.100 ?.010) 12.7 ?1.27 (.500 ?.050) 16.26 ?0.25 (.640 ?.010) 9.14 ?0.25 (.360 ?.010) ceramic 0.72 ?0.12 (.029 ?.005) 1.03 ?0.25 (.041 ?.010) 5.08 ?0.25 (.200 ?.010) 1.02 ?0.25 (.040 ?.010) ceramic dimensions: mm (inches) pwr 221 t - 30 - 10r0 f model pwr = power resistor package 220 = to-220 style pin style t = through-hole power 30 = 30 w resistance value <100 ohms ... ?r? represents decimal point (examples: 7r50 = 7.5 ; r500 = 0.5 ) 100 ohms ... first three digits are signi? cant, fourth digit represents number of zeros to follow (exam- ples: 2000 = 200 ohms; 3002 = 30k ohms) absolute tolerance j = 5 % f = 1 % how to order energy in joules overload duration in seconds 10 100 1 0.1 0.01 10 -6 10 -5 10 -4 10 -3 10 -2
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