general note irc reserves the right to make changes in product speci?cation without notice or liability. all information is subject to ircs own data and is considered accurate at time of going to print. a subsidiary of tt electronics plc ? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com fireproof high temperature ceramic case with stand-off inorganic fireproof encapsulant allo y resistance wire on fiberglass substrate pwr series ? 3, 5, 7, and 10 watts ? 0.1 ? to 18k ? range ? radial leads for pc mount ? tcs from 300 ppm/c to +5500 ppm/c general purpose stand-up power wirewound resistor dimensions (inches and (mm)) irc type a b c d e ld pwr-3 0.475 0.030 (12.0 0.8) 0.320 0.030 (8.1 0.8) 1.00 0.030 (25.4 0.8) 0.200 0.062 (5.08 1.6) 0.175 0.062 (4.44 1.6) 0.036 0.002 (0.91 0.05) pwr-5 0.500 0.030 (12.7 0.8) 0.350 0.030 (8.8 0.8) 1.00 0.030 (25.4 0.8) 0.200 0.062 (5.08 1.6) 0.175 0.062 (4.44 1.6) 0.036 0.002 (0.91 0.05) pwr-7 0.500 0.030 (12.7 0.8) 0.350 0.030 (8.8 0.8) 1.50 0.032 (38.1 0.81) 0.200 0.062 (5.08 1.6) 0.175 0.062 (4.44 1.6) 0.036 0.002 (0.91 0.05) pwr-10 0.630 0.032 (16.0 0.81) 0.510 0.032 (13.2 0.81) 1.39 0.032 (35.3 0.81) 0.290 0.062 (7.4 1.6) 0.250 0.062 (6.4 1.6) 0.036 0.002 (0.91 0.05) physical data speci?cations - power rating: 3, 5, 7, and 10 watts - resistance range: 3 watt: 0.1 ? to 7.5k 7 watt: 0.1 ? to 18k 5 watt: 0.1 ? to 8.5k 10 watt: 0.18 ? to 18k - tolerance: 5% and 10% (refer to pwrg for tolerances less than 5% pg.129) - flameproof inorganic construction - eia rs-344, insulated ?xed wirewound resistors a c e b ld d 0.080 0.032 0.17 0 0.062 meniscus per mitted to bottom of f eet pwr series issue november 2008 sheet 1 of 2
? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com general purpose stand-up power wirewound resistor temperature rise chart 300 200 100 0 0 20 40 60 80 100 120 hot spot temperature (c) rated power (%) pwr - 7, 10 pwr - 3, 5 power derating curve 100 80 60 40 0 50 100 150 200 250 hot spot temperature (c) rated power (%) pwr - 7, 10 20 0 85 25 pwr - 3, 5 sample part no. irc type pwr power resistance range tolerance j = 5%, k = 10% rohs indicator lf indicates rohs compliance ordering data pwr 10 1202 k lf pwr series issue november 2008 sheet 2 of 2
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