General Purpose Radial Terminal Power Wirewound Resistor Inorganic fireproof encapsulant PW Radial Series * * * * * 0.10 to 2.0K 20 watts to 50 watts 10% or 5% tolerance RoHS compliant construction available Custom parts available - consult factory Tinned steel Steatite ceramic case Alloy resistance wire on fiberglass substrate Electrical Data IRC Type Power Rating @ 25C (watts) Resistance Range (ohms) PW-20E 20 0.1 to 2.0K PW-30 30 0.5 to 1.2K PW-40 40 0.65 to 1.5K PW-50E 50 0.08 to 1.8K - Flameproof inorganic construction - EIA RS-344, insulated fixed wirewound resistors - 1000 hour load life at 25C: 5% max. - Moisture no load 240 hours: 2% max. - Temperature cycling (5 cyc.): 5% max. Temperature Rise Chart Power Derating Curve 100 PW - 50E PW - 20E 200 PW - 40 100 0 0 PW - 30 25 50 75 100 Percent of Rated Load 125 Percent of Rated Load Temperature Rise (C) 300 PW - 20E, PW - 30, PW - 40 PW - 50E without Bracket 80 60 40 20 0 0 50 100 150 200 Ambient Temperature (C) 250 With Bracket: PW-30 Increased to 40 watts PW-40 Increased to 50 watts PW-50 Increased to 60 watts 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 PW Radial Series Issue December 2008 Sheet 1 of 2 General Purpose Radial Terminal Power Wirewound Resistor Physical Data PW-20E Wirewound PW-30, 40 and 50E Wirewound 0.250 (Typ.) 5/32 Dia. Thru (2) A A 0.0320.0025 0.2820.020 0.0320.0025 0.1570.020 5/32 Dia. Thru (2) 0.50.030 0.750.030 0.25 B 0.375 0.750.030 0.75 0.875 0.50.030 7/32 Dia. Printed Circuit Terminal PW-20E Alternate Terminal Configuration -0.020" Tin coated Steel 0.205 or 0.1870.005 0.1250.015 0.200 (Typ.) 0.1350.015 0.250.031 0.0690.005 Dimensions (Inches (mm)) IRC Type A B PW-20E 1.875 0.030 2.5 0.060 PW-30 2.00 0.030 2.55 0.060 PW-40 2.45 0.030 3.00 0.060 PW-50E 3.075 0.030 3.625 0.060 Ordering Data Sample Part No. PW 18 1202 K LF IRC Type PW20E, PW30, PW40, PW50E Power 18 = 18 watts Resistance Value (standard EIA values) Tolerance 10% or 5% standard 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 PW Radial Series Issue December 2008 Sheet 2 of 2