general purpose power wirewound resistors pw series 2 watts to 25 watts 0.10 ohms to 30k ohms ?0% or ?% tolerance tc s from 300 ppm/? to +5500 ppm/? 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. ?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 111 PW-2 pw-3 pw-5 pw-7 pw-10 pw-15 pw-18 PW-22 PW-25 power rating at 25? watts 23571015182225 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%/? 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%/? 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%/? 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%/? 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%/? 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 electrical data physical data issue b ?03.02 a subsidiary of tt electronics plc welwyn components please note: when ordering the alternative configuration please add an ??after the part number. (i.e., PW-2a) dimensions (mm) l ?.8 w ?.8 h ?.8 d dia. e ?.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 l 0.125 max. d w h ll e f standard configuration alternate configuration
general purpose power wirewound resistors pw series ? 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 112 issue b ?03.02 welwyn components 100 80 60 40 20 0 0 50 100 150 200 250 ambient temperature ( c) percent of rated load 25 40 85 PW-2 pw-3, 5, 7, 10 pw-15, 18, 22, 25 300 250 200 150 100 50 0 0 20406080100120 temperature rise ( c) percent of rated load PW-22, 25 pw-15, 18 pw-10 pw-7 pw-5 pw-3 power derating temperature rise packaging resistors are supplied bulk packed. quantity 500.
general purpose power wirewound resistors pw series 20 watts to 50 watts 0.10 ohms to 2.0k ohms ?0% or ?% tolerance customs 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. ?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 113 PW-20e pw-30 pw-40 pw-50e power rating at 25? watts 20 30 40 50 resistance range ohms 0r1 to 2k 0r5 to 1k2 0r65 to 1k5 0r08 to 1k8 electrical data issue b ?03.02 a subsidiary of tt electronics plc welwyn components please note: when ordering the alternative configuration please add an ??after the part number. (i.e., PW-2a) 0.032 PW-20e wirewound pw-30, 40 and 50e wirewound PW-20e alternate terminal configuration printed circuit terminal dimensions (inches) a ?.030 b ?.060 PW-20e 1.875 2.50 pw-30 2.00 2.55 pw-40 2.45 3.00 pw-50e 3.075 3.625 2.000 pw-15e 100 80 60 40 20 0 0 50 100 150 200 250 ambient temperature ( with bracket: pw-30 increased to 40 watts pw-40 increased to 50 watts pw-50 increased to 60 watts power derating temperature rise
0.250 0.020 0.205 0.020 0.900 0.050 1.106 0.050 meniscus allowable to the termination edge see meniscus note 0.709 0.030 0.273 0.010 dia. 0.375 0.040 0.125 rad. (ref.) 0.062 rad. (2) 0.155 0.005 0.500 0.030 0.290 0.030 3.000 0.040 2.375 0.040 0.500 0.040 0.313 0.050 0.020 0.020 0.187 0.020 0.060 dia. (2) 0.685 0.060 1.000 0.040 0.900 0.050 pw-30e packaging resistors are supplied bulk packed. quantity 500. general purpose power wirewound resistors pw series ? 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 114 issue b ?03.02 welwyn components
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