semi-precision power wirewound resistor (n)as series 0.25 to 10 wats tolerance down to 0.5% 0.1 ohm to 175k ohms resistance wire tcr 20 ppm/c non inductve (NAS) opton pb-free opton is rohs compliant 1r0-1k0 1r0-6k0 1r0-7k5 1r0-2k0 1r0-20k 1r0-24k 1r0-18k 1r0-30k 1r0-60k 1r0-90k 1r0-175k semi-pr ecision power w i r ewound resistor as series ? 0.25 to 10 watts ? t olerance down to 0.5% ? 0.1 ohm to 175k ohms ? resistance wir e tcr 20 ppm/c general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liability . all information is subject to w elwyn? s own data and is consider ed accurate at time of going to print. ? 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: www .welwyn-tt.com 91 issue d 03.06 a subsidiary of tt electr onics plc w elwyn components dimensions inches (mm) t ype (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 physical data a e d c b electrical data equivalent power rating commer cial range non-inductive range a vailable resistance mil-r-26 (watts) (ohms) (ohms) (ohms) t ype style 125c 25c min. max. min. max. 0.5%, 1% 3%, 5% (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 rw81 rw70u rw79u rw74u rw78u 0.25 0.5 1 1 2 3 2 3 5 7 10 a 0.032 (0.81) 0.250(6.4) 0.312(7.9) 0.367(9.3) 0.256(6.5) 0.480(12.2) 0.540(13.7) 0.489(11.0) 0.687(17.5) 0.875(22.2) 1.250(31.8) 1.812(46.0) b (max) 0.094 (2.4) 0.094 (2.4) 0.125 (3.2) 0.115 (2.9) 0.250 (6.3) 0.219 (5.6) 0.157 (4.0) 0.282 (7.2) 0.344 (8.8) 0.344 (8.8) 0.385 (9.8) c (max) 0.312 (7.9) 0.375 (9.5) 0.429 (10.9) 0.303 (7.7) 0.600 (15.2) 0.663 (16.6) 0.594 (15.1) 0.812 (20.6) 0.980 (24.9) 1.375 (35.0) 1.937 (49.2) d (nom) 0.020 (0.5) 0.020 (0.5) 0.020 (0.5) 0.025 (0.64) 0.032 (0.8) 0.032 (0.8) 0.032 (0.8) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) e (min) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.30 (33.0) 1.30 (33.0) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 0r1 0r1 0r1 r05 0r1 0r1 0r1 0r1 0r1 0r1 0r1 1 1 2 2 3 4 3 5 7 9 14 1k0 6k0 7k5 2k0 20k 24k 18k 30k 60k 90k 175k 0r2 0r5 0r2 10r r25 0r1 0r2 0r1 0r1 0r2 0r2 60r 60r 3k8 1k0 10k 12k 7k5 15k 30k 45k 50k 0r1-1k0 0r1-6k0 0r1-7k5 r05-2k0 0r1-20k 0r1-24k 0r1-18k 0r1-30k 0r1-60k 0r1-90k 0r1-175k 1r0-1k0 1r0-6k0 1r0-7k5 1r0-2k0 1r0-20k 1r0-24k 1r0-18k 1r0-30k 1r0-60k 1r0-90k 1r0-175k semi-pr ecision power w i r ewound resistor as series ? 0.25 to 10 watts ? t olerance down to 0.5% ? 0.1 ohm to 175k ohms ? resistance wir e tcr 20 ppm/c general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liability . all information is subject to w elwyn? s own data and is consider ed accurate at time of going to print. ? 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: www .welwyn-tt.com 91 issue d 03.06 a subsidiary of tt electr onics plc w elwyn components dimensions inches (mm) t ype (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 physical data a e d c b electrical data equivalent power rating commer cial range non-inductive range a vailable resistance mil-r-26 (watts) (ohms) (ohms) (ohms) t ype style 125c 25c min. max. min. max. 0.5%, 1% 3%, 5% (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 rw81 rw70u rw79u rw74u rw78u 0.25 0.5 1 1 2 3 2 3 5 7 10 a 0.032 (0.81) 0.250(6.4) 0.312(7.9) 0.367(9.3) 0.256(6.5) 0.480(12.2) 0.540(13.7) 0.489(11.0) 0.687(17.5) 0.875(22.2) 1.250(31.8) 1.812(46.0) b (max) 0.094 (2.4) 0.094 (2.4) 0.125 (3.2) 0.115 (2.9) 0.250 (6.3) 0.219 (5.6) 0.157 (4.0) 0.282 (7.2) 0.344 (8.8) 0.344 (8.8) 0.385 (9.8) c (max) 0.312 (7.9) 0.375 (9.5) 0.429 (10.9) 0.303 (7.7) 0.600 (15.2) 0.663 (16.6) 0.594 (15.1) 0.812 (20.6) 0.980 (24.9) 1.375 (35.0) 1.937 (49.2) d (nom) 0.020 (0.5) 0.020 (0.5) 0.020 (0.5) 0.025 (0.64) 0.032 (0.8) 0.032 (0.8) 0.032 (0.8) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) e (min) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.30 (33.0) 1.30 (33.0) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 0r1 0r1 0r1 r05 0r1 0r1 0r1 0r1 0r1 0r1 0r1 1 1 2 2 3 4 3 5 7 9 14 1k0 6k0 7k5 2k0 20k 24k 18k 30k 60k 90k 175k 0r2 0r5 0r2 10r r25 0r1 0r2 0r1 0r1 0r2 0r2 60r 60r 3k8 1k0 10k 12k 7k5 15k 30k 45k 50k 0r1-1k0 0r1-6k0 0r1-7k5 r05-2k0 0r1-20k 0r1-24k 0r1-18k 0r1-30k 0r1-60k 0r1-90k 0r1-175k 1r0-1k0 1r0-6k0 1r0-7k5 1r0-2k0 1r0-20k 1r0-24k 1r0-18k 1r0-30k 1r0-60k 1r0-90k 1r0-175k semi-pr ecision power w i r ewound resistor as series ? 0.25 to 10 watts ? t olerance down to 0.5% ? 0.1 ohm to 175k ohms ? resistance wir e tcr 20 ppm/c general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liability . all information is subject to w elwyn? s own data and is consider ed accurate at time of going to print. ? 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: www .welwyn-tt.com 91 issue d 03.06 a subsidiary of tt electr onics plc w elwyn components dimensions inches (mm) t ype (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 physical data a e d c b electrical data equivalent power rating commer cial range non-inductive range a vailable resistance mil-r-26 (watts) (ohms) (ohms) (ohms) t ype style 125c 25c min. max. min. max. 0.5%, 1% 3%, 5% (n)as- 1 / 4 (n)as- 1 / 2 (n)as-1 (n)as-1c (n)as-2 (n)as-2b (n)as-2c (n)as-3 (n)as-5 (n)as-7 (n)as-10 rw81 rw70u rw79u rw74u rw78u 0.25 0.5 1 1 2 3 2 3 5 7 10 a 0.032 (0.81) 0.250(6.4) 0.312(7.9) 0.367(9.3) 0.256(6.5) 0.480(12.2) 0.540(13.7) 0.489(11.0) 0.687(17.5) 0.875(22.2) 1.250(31.8) 1.812(46.0) b (max) 0.094 (2.4) 0.094 (2.4) 0.125 (3.2) 0.115 (2.9) 0.250 (6.3) 0.219 (5.6) 0.157 (4.0) 0.282 (7.2) 0.344 (8.8) 0.344 (8.8) 0.385 (9.8) c (max) 0.312 (7.9) 0.375 (9.5) 0.429 (10.9) 0.303 (7.7) 0.600 (15.2) 0.663 (16.6) 0.594 (15.1) 0.812 (20.6) 0.980 (24.9) 1.375 (35.0) 1.937 (49.2) d (nom) 0.020 (0.5) 0.020 (0.5) 0.020 (0.5) 0.025 (0.64) 0.032 (0.8) 0.032 (0.8) 0.032 (0.8) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) 0.040 (1.0) e (min) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.30 (33.0) 1.30 (33.0) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 1.50 (38.1) 0r1 0r1 0r1 r05 0r1 0r1 0r1 0r1 0r1 0r1 0r1 1 1 2 2 3 4 3 5 7 9 14 1k0 6k0 7k5 2k0 20k 24k 18k 30k 60k 90k 175k 0r2 0r5 0r2 10r r25 0r1 0r2 0r1 0r1 0r2 0r2 60r 60r 3k8 1k0 10k 12k 7k5 15k 30k 45k 50k 0r1-1k0 0r1-6k0 0r1-7k5 r05-2k0 0r1-20k 0r1-24k 0r1-18k 0r1-30k 0r1-60k 0r1-90k 0r1-175k ma ke p ossibl e resistors 02.16 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com all pb-free parts comply with eu directve 2011/65/eu (rohs2)
semi-precision power wirewound resistor (n)as series semi-pr ecision power w i r ewound resistor as series ? 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: www .welwyn-tt.com 92 issue d 03.06 w elwyn components power derating t emperatur e rise @ 25c selected pulse-handling capability @ 125c t emperatur 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 25 75 125 175 225 275 275 250 200 150 100 50 25 hot spot t emperature (c) percent of 25c power rating as-1/4 as-7, 10 as-1/2 as-2c as-3, as-5 as-2b as-1c 0 40 80 120 160 200 as-1,2 275 250 200 150 125 hot spot t emperature ( c) percent of 125 c power rating as-1,2 as-7, 10 as-1/2 as-1/4 as-2c as-3, as-5 as-2b as-1c 0 40 80 120 160 200 14 12 10 8 6 4 2 0 energy (watts-second) resistance (ohms) 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% moistur e resistance 1.0% t emperatur e cycle 0.5% short t ime overload 0.5% low t emperatur e operation 0.5% solder heat 0.25% shock 0.5% v ibration 0.5% envir onmental t esting at 25c semi-pr ecision power w i r ewound resistor as series ? 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: www .welwyn-tt.com 92 issue d 03.06 w elwyn components power derating t emperatur e rise @ 25c selected pulse-handling capability @ 125c t emperatur 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 25 75 125 175 225 275 275 250 200 150 100 50 25 hot spot t emperature (c) percent of 25c power rating as-1/4 as-7, 10 as-1/2 as-2c as-3, as-5 as-2b as-1c 0 40 80 120 160 200 as-1,2 275 250 200 150 125 hot spot t emperature ( c) percent of 125 c power rating as-1,2 as-7, 10 as-1/2 as-1/4 as-2c as-3, as-5 as-2b as-1c 0 40 80 120 160 200 14 12 10 8 6 4 2 0 energy (watts-second) resistance (ohms) 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% moistur e resistance 1.0% t emperatur e cycle 0.5% short t ime overload 0.5% low t emperatur e operation 0.5% solder heat 0.25% shock 0.5% v ibration 0.5% envir onmental t esting at 25c environmental testng performance data ma ke p ossibl e 02.16 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com
semi-precision power wirewound resistor (n)as series ordering procedure o r d e r ing pr o cedur e t h i s p ro d u c t h a s t w o v a lid p a rt num bers : e u r opean ( w e lw y n ) p a r t nu m b e r: a s 3 - 2 7 k f i ( a s 3 , 2 7 k i l ohm s 1 % , p b - f r ee) a s 3 - 2 7 k f i 1 2 3 4 5 us a ( irc) p a r t nu m b e r : a s 3 2 7 0 2 flf ( a s 3 , 2 7 k ilo h m s 1 % , p b - f r e e ) a s 3 2 7 0 2 f l f 1 2 3 4 5 1 2 3 4 5 w inding t y p e va lue tole r a n c e t e r m ina ti on & pa c k ing o m i t fo r s t a n dard e24 = 3 / 4 c hara c t e r s r = ohm s k = k i l o h m s d = 0 . 5 % i = pb - f re e , st a ndar d p a c k i n g bulk* f = 1 % 1000 / box n = non - i ndu c t i v e h = 3 % j = 5 % as7, 10 1 2 3 4 5 w inding t y p e va lue tole r a n c e t e r m ina ti on & pa c k ing o m i t fo r s t a n dard 3 d i g i t s + m u l t i p l i e r d = 0 . 5 % f = 1 % n = non - i ndu c t i v e r = ohm s f o r v a l ues <100 ohm s h = 3 % j = 5 % as1 / 4 , 1/2, 1, 1c, 2, 2b, 2c, 3, 5 500/ box as1/4, as1/2 as1, as1c as2, as2b as2c, as3 as5, as7, as10 as1/4, as1/2 as1, as1c as2, as2b as2c, as3 as5, as7, as10 * tape and reel available on request * tape and reel available on request lf=pb-free, omit for snpb standard packing bulk* as1/4, 1/2, 1, 1c, 2, 2b 2c, 3, 5 as7, 10 500/box 1000/box ma ke p ossibl e 02.16 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com
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