SPH WELWYN | Alldatasheet

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Technical content

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 Type FPSHPS EIA RS-344 Style CRU2 MIL-R-11 Style RC32/RC42 k1 ot 1R04k2 ot 1R0smhoecnatsiseR 01± ,5±%ecnareloT C°07 ta 2sttawgnitar rewoP 1 at 115°C Derating to 0 at 160°C Maximum continuous working voltage √PR geM 000,01yrdecnatsiser noitalusni muminiM geM 001tew V0001MTAstlov gnidnatshtiw cirtceleid muminiM V526SMRerusserp decudeR sttaw 2 ta C°541sttawesir 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 Physical Data LD 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.

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 Issue B · 03.02 Welwyn Components FPSHPS 0071± 01.00001± 61.0 - 1.0smho*)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 1000VSMRegatlov 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) Pow er a stt ) 0.1 ohm 1 ohm 10 ohm 100 ohm 1000 ohm Power Input (watts) Temp (° C) SPF Typical Fusing SPH & SFF Temperature Rise Packaging Resistors are supplied taped and reel. 4,000 pcs per reel. *All ppm levels listed are maximum