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| General-Purpose Failsafe Moulded Wirewound Resistors SPH/SPF Series Welwyn Components * 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 Electrical Data Type EIA RS-344 Style MIL-R-11 Style Resistance Tolerance Power rating ohms % watts 0R1 to 2k4 5, 10 2 at 70C 1 at 115C Derating to 0 at 160C Maximum continuous working voltage Minimum insulation resistance Minimum dielectric withstanding volts Reduced pressure Hotspot temperature rise Current noise dry wet ATM RMS watts PR 10,000 Meg 100 Meg 1000V 625V 145C at 2 watts Negligible S PH CRU2 RC32/RC42 0R1 to 1k SPF Physical Data Dimensions (mm) Type SPH SPF L 14.3 0.25 14.3 0.25 D 5.72 0.20 5.72 0.20 d 0.813 0.05 0.813 0.05 f 38.1 3.2 38.1 3.2 d D L f 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. Encapsulation The SPH and SPF are encapsulated utilizing a compression moulded phenolic plastic material. The SPF has a flameresistance coating applied over the resistive element to provide flammmability protection when destructive overloads may occur. 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. 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. 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. A subsidiary of TT electronics plc Issue B * 03.02 (c) 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 General-Purpose Failsafe Moulded Wirewound Resistors SPH/SPF Series Welwyn Components Performance Data SP H Temperature coefficient (ppm)* ohms 0.1 - 0.16 1000 0.18 - 0.68 800 0.75 -2400 400 Dielectric withstanding voltage Momentary overload Low temperature operation Temperature cycle Humidity Load life Terminal strength Resistance to solder heat RMS % % % % % % % 1000V 5 5 5 5 5 5 5 S PF 0.10 1700 0.11 - 0.16 1000 0.18 - 0.68 800 0.75 - 1000 400 *All ppm levels listed are maximum SPH Power Derating SPF Power Derating Power (watts) Ambient Temperature (C) Power (watts) Ambient Temperature (C) SPF Typical Fusing SPH & SFF Temperature Rise Power (watts) 10 ohm 100 ohm 1000 ohm Time (seconds) Temp (C) 0.1 ohm 1 ohm Power Input (watts) Packaging Resistors are supplied taped and reel. 4,000 pcs per reel. (c) 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 |
Price & Availability of SPF
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