semi-precision power wirewound resistor as series 0.25 to 10 watts tolerance down to ?.5% 0.1 ohm to 175k ohms resistance wire tcr ?0 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 91 issue d ?03.06 a subsidiary of tt electronics plc welwyn components dimensions (mm) type a ?.81 b (max) c (max) d (lead diameter) as- 1 / 4 6.4 2.4 7.9 0.5 as- 1 / 2 7.9 2.4 9.5 0.5 as-1 9.3 3.2 10.9 0.5 0.64 as-1c 6.5 2.9 7.7 0.64 0.8 as-2 12.2 6.3 15.2 0.8 as-2b 13.7 5.6 16.6 0.8 as-2c 11.0 4.0 15.1 0.8 as-3 17.5 7.2 20.6 1.0 as-5 22.2 8.8 24.9 1.0 as-7 31.8 8.8 35.0 1.0 as-10 46.0 9.8 49.2 1.0 * leads are solder plated. as-1c leads are copper. all others are 40% conductivity copper sheathed steel. electrical data equivalent power rating commercial range non-inductive range available resistance mil-r-26 (watts) (ohms) (ohms) (ohms) type style 125? 25? min. max. min. max. 0.5%, 1% 3%, 5% as- 1 / 4 rw81 0.5 1 0.1 1.0k * * 1-1k 0.1-1k as- 1 / 2 0.5 1 0.1 6.0k * * 1-6k 0.1-6k as-1 rw70u 1 2 0.1 7.5k 0.1 3.8k 1-7.5k 0.1-7.5k as-1c 1 2 .05 2k * * 1-2k .05-2k as-2 rw-69v/ 2 3 0.1 20k 0.5 10k 1-20k 0.1-20k rw79u as-2b 3 4 0.1 24k 0.5 12k 1-24k 0.1-24k as-2c 2 3 0.1 18k 0.2 7.5k 1-18k 0.1-18k as-3 3 5 0.1 30k 0.5 15k 1-30k 0.1-30k as-5 rw74u/ 5 7 0.1 60k 0.8 30k 1-60k 0.1-60k rw67u as-7 7 9 0.1 90k 1.0 45k 1-90k 0.1-90k as-10 rw68v/ 10 14 0.1 175k 3.0 50k 1-175k 0.1-175k rw78u inductance of as-1/2 is less than 1? at 1mhz. * typical inductance of as-1c <5ohms is <1?. to order non-inductive types, add the prefix ?? example: nas-1, nas-2c, etc. lower values available upon request. physical data a d c 1.50 min. (38.1) b please note lead length dimension change on the following two items only: as-2b 33.0mm (min) as-2c 33.0mm (min) note: coating and marking is resistant to normal freon degreasing. consult factory for special requirements. as marking available in alpha numeric or colourbanding - identification available.
semi-p r ecision powe r w i r ewound resisto r as serie s ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0 ) 1670 822181 facsimile: +44 (0 ) 1670 829465 email: info@welwyn-tt.com w ebsite: ww w .welwyn-tt.com 92 issue d 03.06 w elwyn components power derating t emperatu r e rise @ 25c selected pulse-handling capability @ 125c t emperatu r e rise @ 125c 200 175 150 125 100 75 0 percent of 125c power rating ambient t emperature (c) as-1/4, 1/2, 1, 1c as-3, 2 as-2c as-5, 10 as-2b as-7 2 5 7 5 12 5 17 5 22 5 275 275 250 200 150 100 50 25 hot spot t emperature (c) percent of 25c power rating as-1/4 as-7, 10 as-1/2 as-2a, 2c as-3, as-5 as-2b 0 4 0 8 0 12 0 16 0 200 as-2a, 2c 275 250 200 150 125 hot spot t emperature ( c) percent of 125 c power rating as-2 as-7, 10 as-1/2 as-1/4 as-2a, 2c as-3, as-5 as-2b 0 4 0 8 0 12 0 16 0 200 14 12 10 8 6 4 2 0 energy (watts-second) resistance (ohms) as-2 a as-3 as-2b as-2 as-2c as-1 as-1/2 as-1/4 0. 1 0. 2 0. 5 1 2 5 10 t est condition max ? r load life 1000 hours 1.0% moistu r e resistance 1.0% t emperatu r e cycle 0.5% short t ime overload 0.5% low t emperatu r e operation 0.5% solder heat 0.25% shock 0.5% v ibration 0.5% envi r onmental t esting at 25c
semi-p r ecision powe r w i r ewound resisto r as serie s ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0 ) 1670 822181 facsimile: +44 (0 ) 1670 829465 email: info@welwyn-tt.com w ebsite: ww w .welwyn-tt.com issue d 03.06 w elwyn components o r d e r i n g p r o ce d u r e e x a m p l e : as 1 / 4 a t 1 k il o h m and 5% t o l e r an c e on a r e e l o f 2000 p i e c e s - a s 1 / 4 ? 1 k 0 j i w in d i n g s t and a r d n n o n - i ndu c t i ve t y p e v a l ue ( u s e i e c62 c ode ) t o l e r an c e ( u s e i e c62 c ode ) d 0 . 5 % h 3 % f 1 % j 5 % p a ck i ng i t ap e as ? , ? , 1 c 2000 / r ee l s t and a r d as 1 , 2 , 2 b , 2 c , 3 1000 / r ee l as 5 , 7 , 1 0 500 / r ee l
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