General Purpose Power Wirewound Resistors Welwyn Components PW Series 2 watts to 25 watts 0.10 ohms to 30K ohms 10% or 5% tolerance TCs from 300 ppm/C to +5500 ppm/C Electrical Data PW-2 PW-3 PW-5 PW-7 PW-10 PW-15 PW-18 PW-22 PW-25 Power rating at 25C watts 2357 10 15 18 22 25 Resistance range ohms 0R15 to 2K4 0R1 to 7K5 0R1 to 8K5 0R1 to 18K 0R18 to 30K 0R18 to 30K 0R18 to 22K 0R27 to 18K 0R27 to 18K Temperature coefficient 0.06%/C 0.15 to 0.99 0.1 to 0.99 0.1 to 0.99 0.1 to 0.99 0.18 to 0.99 0.18 to 0.99 0.18 to 0.99 0.27 to 1.3 0.27 to 1.3 over R range 0.03%/C 1.0 to 2.4K 1.0 to 7.5K 1.0 to 8.5K 1.0 to 18K 1.0 to 30K 1.0 to 30K 1.0 to 22K 1.5 to 12K 1.5 to 10K +0.55%/C 0.1 to 30 0.1 to 86 0.1 to 68 0.1 to 150 0.1 to 240 0.1 to 240 0.1 to 200 0.15 to 360 0.15 to 300 +0.45%/C 0.24 to 130 0.1 to 270 0.1 to 300 0.15 to 680 0.24 to 1100 0.24 to 1100 0.24 to 1100 0.36 to 1800 0.36 to 1200 +0.25%/C 1.0 to 10 0.24 to 20 0.27 to 22 1.0 to 51 1.0 to 82 1.0 to 82 1.0 to 70 1.0 to 120 1.5 to 100 Please note: When ordering the alternative configuration please add an A after the part number. (i.e., PW-2A) Physical Data Dimensions (mm) L 0.8 W 0.8 H 0.8 d dia. E 0.8 LL min. F (ref.) PW-2 17.5 6.35 6.35 0.8 7.87 36.6 1.60 PW-3 22.4 7.87 7.87 0.91 9.65 36.6 1.60 PW-5 22.4 9.65 8.64 0.91 10.4 38.1 1.60 PW-7 35.3 9.65 8.64 0.91 11.9 38.1 3.18 PW-10 47.8 9.65 8.64 0.91 11.9 38.1 3.18 PW-15 47.8 12.7 12.7 0.91 16.0 38.1 3.18 PW-18 47.8 12.7 12.7 0.91 16.0 38.1 3.18 PW-22 63.5 12.7 12.7 1.0* 16.0 38.1 3.18 PW-25 63.5 12.7 12.7 1.0* 16.0 38.1 3.18 * Copper Clad Steel Standard Configuration Alternate Configuration W d E H LL L 0.125 max. F General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 111General Purpose Power Wirewound Resistors Welwyn Components PW Series Power Derating Temperature Rise 25 40 85 100 300 PW-22, 25 PW-2 PW-15, 18 250 80 PW-10 PW-3, 5, 7, 10 200 PW-7 60 PW-5 PW-15, 18, 22, 25 150 PW-3 40 100 20 50 0 0 0 50 100 150 200 250 0 20406080 100120 Ambient Temperature (C) Percent of Rated Load Packaging Resistors are supplied bulk packed. Quantity 500. Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 112 Percent of Rated Load Temperature Rise (C)