general-purpose failsafe moulded wirewound resistors sph/spf series ? drop-in replacement for bwh/bwf ? 2 watt rated with 1 watt dimensions ? 5%, 10% tolerance ? 0.1 ohm to 2400 ohms ? tcr?s as low as 150 ppm/c standard (custom tc?s available) ? weldable and solderable leads 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 93 type fps hps eia rs-344 style cru2 mil-r-11 style rc32/rc42 k1 ot 1r0 4k2 ot 1r0 smho ecnatsiser 01 ,5 % ecnarelot c07 ta 2 sttaw gnitar rewop 1 at 115c derating to 0 at 160c maximum continuous working voltage pr gem 000,01 yrd ecnatsiser noitalusni muminim gem 001 tew v0001 mta stlov gnidnatshtiw cirtceleid muminim v526 smr erusserp decuder sttaw 2 ta c541 sttaw esir erutarepmet topstoh current noise negligible electrical data issue b 03.02 a subsidiary of tt electronics plc welwyn components dimensions (mm) type l d d f sph 14.3 0.25 5.72 0.20 0.813 0.05 38.1 3.2 spf 14.3 0.25 5.72 0.20 0.813 0.05 38.1 3.2 physical data l d f d resistive element all resistor types have resistance alloy winding on a braided fibreglass substrate. intermediate silicone coatings are used to enhance processibility and to provide protection to the resistive element. termination the sph and spf resistors are terminated using an alloy coated copper flashed steel lead welded to a cap of the same material. this termination assembly is mechanically crimped, utilizing an improved crimp design, to the resistive element. encapsulation the sph and spf are encapsulated utilizing a compression moulded phenolic plastic material. the spf has a flame- resistance coating applied over the resistive element to provide flammmability protection when destructive overloads may occur. marking all products are marked utilizing heat and solvent resistant colour code bands consistent with eia/mil requirements. the first band is double width to designate wirewound construction. a fifth band, blue in colour, is used for flameproof identification.
performance data general-purpose failsafe moulded wirewound resistors sph/spf 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 94 issue b 03.02 welwyn components fps hps 0071 01.0 0001 61.0 - 1.0 smho *)mpp( tneiciffeoc erutarepmet 0.18 - 0.68 800 0.11 - 0.16 1000 0.75 -2400 400 0.18 - 0.68 800 0.75 - 1000 400 1000v smr egatlov gnidnatshtiw cirtceleid 5 % daolrevo yratnemom 5 % noitarepo erutarepmet wol 5 % elcyc erutarepmet 5 % ytidimuh 5 % efil daol 5 % htgnerts lanimret 5 % taeh redlos ot ecnatsiser ambient temperature ( c) power (watts) ambient temperature ( c) power (watts) sph power derating spf power derating time (seconds) p o w e r w( a s t t ) 0.1 ohm 1 ohm 10 ohm 100 ohm 1000 ohm power input (watts) temp ( c) spf typical fusing sph & sff temperature rise *all ppm levels listed are maximum
general-purpose failsafe moulded wirewound resistors sph/spf 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 94 issue b 03.02 welwyn components ordering procedure example: sph at 10 ohms and 5% tolerance tape packed on a reel of 1250 pieces ? sph ? 10r j i type value (use iec62 code) tolerance (use iec62 code) j 5% k 10 % packing i tape 1250 /reel s tandard
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