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| General Purpose Wirewound Resistors SPP Series Welwyn Components * * * * 0R1 to 2K4 ohms Positive high TC's upon request Weldable and solderable magnetic leads Lower ranges available - contact factory Electrical Data Type Resistance range Standard Tolerance ohms % SPP-1 0R1 - 1K2* 5, 10 1 @ 85C 0.75 @ 105C Power Rating watts 0.5 @ 125C Derating to 0 @ 160C Load Life Stability Max. Continuous Working Voltage Min. Insulation Resistance - Dry Min. Insulation Resistance - Wet Min. Dielectric Withstanding Voltage Current Noise Temperature Rise at Rated Load, 25C Ambient Approx. 150C watts 1 @ 85C 10% SPP-2 0R1 - 2K4 5, 10 2 @ 85C 1 @ 140C 2 @ 85C 10% PR 10,000 megohm 100 megohm 600 volts RMS Negligible Approx. 200C Approx. 225C SPP-3 0R1 - 2K4 5, 10 3 @ 85C 2 @ 145C 1 @ 190C 3 @ 85C 10% Note: Unless specified otherwise standard test centres are 13/4 inches. Physical Data Dimensions (inches) Type SPP-1 SPP-2 SPP-3 A max 0.400 0.570 0.570 B max 0.148 0.170 0.170 C0.002 0.032 0.032 0.032 1.125 min B C A max. 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. 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 97 General Purpose Wirewound Resistors SPP Series Welwyn Components Performance Data Maximum Limits Temperature Coefficient SPP-1 SPP-2 SPP-3 Thermal Shock Low Shock Short Time Overload Commercial Short Time Overload Resistance to Solder Immersion Solderability Moisture Resistance Life Test Test Method 600/C 0.10-0.91 300/C 1.0-1200 600/C 0.10-0.91 300/C 1.0-2400 600/C 0.10-0.91 600/C 1.0-2400 5% 5% 5% 5% 3% 95% minimum coverage 5% 5% EIA Specification RS-344 Power Derating: 100 Percent Rated Power Temperature Rise: Temperature Rise (C) 300 SPP-3 SPP-2 80 60 SPP-1, 2 40 20 0 0 50 100 SPP-3 200 100 SPP-1 0 0 20 40 60 80 100 150 200 250 300 Ambient Temperature (C) Percent Rated Power Packaging Resistors are supplied taped and reeled. 4,000 pcs per reel. Bulk pack available. (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 98 Issue B * 03.02 |
Price & Availability of SPP
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