general purpose wirewound resistors spp series 0r1 to 2k4 ohms positive high tc s upon request weldable and solderable magnetic leads lower ranges available - contact factory dimensions (inches) type a max b max c?.002 spp-1 0.400 0.148 0.032 spp-2 0.570 0.170 0.032 spp-3 0.570 0.170 0.032 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 97 type spp-1 spp-2 spp-3 resistance range ohms 0r1 - 1k2* 0r1 - 2k4 0r1 - 2k4 standard tolerance ? 5, 10 5, 10 5, 10 1 @ 85? 2 @ 85? 3 @ 85? power rating watts 0.75 @ 105? 1 @ 140? 2 @ 145? 0.5 @ 125? - 1 @ 190? derating to 0 @ 160? - - load life stability watts 1 @ 85? 10% 2 @ 85? 10% 3 @ 85? 10% max. continuous working voltage pr min. insulation resistance - dry 10,000 megohm min. insulation resistance - wet 100 megohm min. dielectric withstanding voltage 600 volts rms current noise negligible temperature rise at rated load, 25? ambient approx. 150? approx. 200? approx. 225? electrical data note: unless specified otherwise standard test centres are 1 3 / 4 inches. physical data issue b ?03.02 a subsidiary of tt electronics plc welwyn components a max. c 1.125 min b fuse/pulse applications spp resistors normally fuse in less than one minute with five to ten times rated wattage depending on the range. by modifying the windings, using a different wire size or type, they can be made to fuse much faster. on the other hand, by using larger wire diameters and higher melt temperature alloys they can handle from five to fifty times overloads of film resistors depending on the range.
maximum limits t emperatu r e coe f ficient spp-1 600/c 0.10 -0.91 300/c 1.0 -1200 spp-2 600/c 0.10 -0.91 300/c 1.0 -2400 spp-3 600/c 0.10 -0.91 600/c 1.0 -2400 thermal shock 5% low shock 5% short t ime overload 5% % 5 d a o l r e v o e m i t t r o h s l a i c r e m m o c % 3 n o i s r e m m i r e d l o s o t e c n a t s i s e r solderability 95% minimum coverage moistu r e resistance 5% life t est 5% t est method eia specification rs-344 general purpos e w i r ewound resistor s spp 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 98 issue b 03.02 w elwyn components performance dat a 100 80 60 40 20 0 0 50 100 150 200 250 300 ambient t emperature ( c) percent rated power spp-1, 2 spp-3 300 200 100 0 0 20 40 60 80 100 t emperature rise ( c) percent rated power spp-1 spp-2 spp-3 : e s i r e r u t a r e p m e t : g n i t a r e d r e w o p o r d e r i n g p r o ce d u r e e x a m p l e : spp1 a t 1 0 0 o h m s and 5% t o l e r an c e t ape p a ck ed on a r ee l ? s p p 1 ? 1 0 0 r j i 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 ) j 5 % k 1 0 % p a ck i ng i t ap e s t and a r d
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