General Purpose Power Wirewound Resistors Welwyn Components PW Series • 2 watts to 25 watts • 0.10 ohms to 30K ohms • ±10% or ±5% tolerance • TC’s 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 Power rating at 25°C watts 2 3 5 7 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 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 0.1 to 240 0.1 to 240 0.1 to 200 0.15 to 360 0.15 to 300 0.03%/°C +0.55%/°C 0.1 to 30 0.1 to 86 0.1 to 68 0.1 to 150 +0.45%/°C 0.24 to 130 0.1 to 270 0.1 to 300 0.15 to 680 +0.25%/°C 1.0 to 10 0.24 to 20 0.27 to 22 1.0 to 51 PW-25 0.24 to 1100 0.24 to 1100 0.24 to 1100 0.36 to 1800 0.36 to 1200 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 d W 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. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 03.02 111 General Purpose Power Wirewound Resistors Welwyn Components PW Series Power Derating 25 40 85 300 PW-22, 25 250 PW-15, 18 PW-2 Temperature Rise (°C) Percent of Rated Load 100 Temperature Rise 80 PW-3, 5, 7, 10 60 PW-15, 18, 22, 25 40 20 0 0 50 100 150 200 Ambient Temperature (°C) 250 PW-10 PW-7 PW-5 PW-3 200 150 100 50 0 0 20 40 60 80 100 120 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: [email protected] · Website: www.welwyn-tt.com 112 Issue B · 03.02 General Purpose Power Wirewound Resistors Welwyn Components PW Series • 20 watts to 50 watts • 0.10 ohms to 2.0K ohms • ±10% or ±5% tolerance • Customs Electrical Data PW-20E PW-30 PW-40 Power rating at 25°C watts 20 30 40 PW-50E 50 Resistance range ohms 0R1 to 2K 0R5 to 1K2 0R65 to 1K5 0R08 to 1K8 Please note: When ordering the alternative configuration please add an ‘A’ after the part number. (i.e., PW-2A) Dimensions (Inches) A ±0.030 PW-20E 1.875 PW-30 2.00 PW-40 2.45 PW-50E 3.075 PW-20E Wirewound B ±0.060 2.50 2.55 3.00 3.625 PW-30, 40 and 50E Wirewound 0.250 (Typ.) 5/32 Dia. Thru (2) 5/32 Dia. Thru (2) 0.032±0.0025 A A 0.032±0.0025 0.282±0.020 0.157±0.020 0.75±0.030 Power Derating Percent of Rated Load 100 PW-20E, PW-30, PW-40 PW-50E without bracket 80 0.75 0.375 0.200 (Typ.) 0.125±0.015 0.205 or 0.187±0.005 40 B 0.75±0.030 0.875 0.5±0.030 60 0.069±0.005 20 0 0.25 0.5±0.030 0.135±0.015 0.25±0.031 0 50 100 150 200 Ambient Temperature (°C) 250 PW-20E Alternate Terminal Configuration Printed Circuit Terminal With Bracket: PW-30 Increased to 40 watts PW-40 Increased to 50 watts PW-50 Increased to 60 watts 0.020 PW-15E 0.500±0.030 Temperature Rise 0.250 min. 2.000±0.040 Temperature Rise (°C) 300 PW-50E 250 1.410±0.040 0.060 Dia. (2) 200 0.187±0.010 PW-20E PW-40 150 100 PW-30 0.840±0.040 50 0 1.050 Min. 0.500±0.030 0 25 50 75 100 Percent of Rated Load 125 General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 03.02 113 General Purpose Power Wirewound Resistors Welwyn Components PW Series PW-30E 0.250±0.020 Meniscus allowable to the termination edge 1.106±0.050 0.205±0.020 0.900±0.050 0.375±0.040 0.709±0.030 0.062 Rad. (2) 0.273±0.010 Dia. 0.125 Rad. (Ref.) 0.290±0.030 0.155±0.005 0.685±0.060 1.000±0.040 0.500±0.030 3.000±0.040 0.020 2.375±0.040 0.313±0.050 0.187±0.020 0.020 0.900 ±0.050 0.500±0.040 0.060 Dia. (2) See Meniscus Note 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: [email protected] · Website: www.welwyn-tt.com 114 Issue B · 03.02