General Purpose Stand-Up Power Wirewound Resistor Fireproof high temperature ceramic case with stand-off PWR Series • 3, 5, 7, and 10 watts • 0.1Ω to 18KΩ range Inorganic fireproof encapsulant • Radial leads for PC mount • TC’s from 300 ppm/°C to +5500 ppm/°C Alloy resistance wire on fiberglass substrate Specifications - Power Rating: 3, 5, 7, and 10 watts - Resistance Range: 7 watt: 0.1Ω to 18K 3 watt: 0.1Ω to 7.5K 5 watt: 0.1Ω to 8.5K 10 watt: 0.18Ω to 18K - Tolerance: ±5% and ±10% (refer to PWRG for tolerances less than 5% pg.129) - Flameproof inorganic construction - EIA RS-344, insulated fixed wirewound resistors Physical Data B A C Meniscus permitted to bottom of feet 0.080 ±0.032 LD 0.170 ±0.062 E D Dimensions (Inches and (mm)) IRC Type PWR-3 PWR-5 PWR-7 PWR-10 A B C D E LD 0.475 ±0.030 0.320 ±0.030 1.00 ±0.030 0.200 ±0.062 0.175 ±0.062 0.036 ±0.002 (12.0 ±0.8) (8.1 ±0.8) (25.4 ±0.8) (5.08 ±1.6) (4.44 ±1.6) (0.91 ±0.05) 0.500 ±0.030 0.350 ±0.030 1.00 ±0.030 0.200 ±0.062 0.175 ±0.062 0.036 ±0.002 (12.7 ±0.8) (8.8 ±0.8) (25.4 ±0.8) (5.08 ±1.6) (4.44 ±1.6) (0.91 ±0.05) 0.500 ±0.030 0.350 ±0.030 1.50 ±0.032 0.200 ±0.062 0.175 ±0.062 0.036 ±0.002 (12.7 ±0.8) (8.8 ±0.8) (38.1 ±0.81) (5.08 ±1.6) (4.44 ±1.6) (0.91 ±0.05) 0.630 ±0.032 0.510 ±0.032 1.39 ±0.032 0.290 ±0.062 0.250 ±0.062 0.036 ±0.002 (16.0 ±0.81) (13.2 ±0.81) (35.3 ±0.81) (7.4 ±1.6) (6.4 ±1.6) (0.91 ±0.05) General Note IRC reserves the right to make changes in product specification without notice or liability. All information is subject to IRC’s own data and is considered accurate at time of going to print. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com A subsidiary of TT electronics plc PWR Series Issue November 2008 Sheet 1 of 2 General Purpose Stand-Up Power Wirewound Resistor Power Derating Curve Temperature Rise Chart 200 PWR - 7, 10 PWR - 3, 5 100 0 25 100 Hot Spot Temperature (°C) Hot Spot Temperature (°C) 300 0 20 40 60 80 100 120 85 PWR - 3, 5 80 PWR - 7, 10 60 40 20 Rated Power (%) 0 0 50 100 150 Rated Power (%) 200 250 Ordering Data Sample Part No. PWR 10 1202 K LF IRC Type PWR Power Resistance Range Tolerance J = ±5%, K = ±10% RoHS Indicator LF indicates RoHS compliance Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com PWR Series Issue November 2008 Sheet 2 of 2