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| Moulded Surface Mount Wirewound Resistors WSM Series Welwyn Components * Ideal for automatic pick and place * Direct replacement for Axial resistors * All welded construction Electrical Data WSM1 Power rating at 70C Resistance range Limiting element voltage TCR Resistance tolerance Standard values Ambient temperature range *Note 5% or 10% preferred below 0.1 ohms C watts ohms volts ppm/C % < 1 : 100 1 : 20 1 0R01 to 1K WSM2 2 0R01 to 2K 100 < 1 : 100 1 : 20 *1, 2, 5, 10 E24 preferred -55 to 155 .03 700 0.1 : 200 10R 100 >10R 20 WSM3 3 0R01 to 3K Physical Data Dimensions (mm) Type WSM1 WSM2 WSM3 L max 7.9 12 18 I Nom 2.54 3.1 3.1 W Max 7 10.5 16 w Max 4.2 6.6 7 H Max 3.94 5.5 6.5 I H L W w Recommended Pad Sizes Type WSM1 WSM2 WSM3 A 2.9 3.4 3.4 B 2.6 4.0 4.5 C 2.8 6 11 D 8.1 14 20 A D B C Construction A high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. The resistive element is wound on the substrate and welded to the caps. The unit is then moulded. Marking WSM resistors are legend marked with type value and tolerance. WSM1 Resistors are marked with value and tolerance. Solvent Resistance Flammability The resistor coating is a flame retardant epoxy to UL 94. 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 C * 04.03 The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. (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 45 Moulded Surface Mount Wirewound Resistors WSM Series Welwyn Components Physical Data Dimensions (mm) Ao WSM1 WSM2 WSM3 4.2 6.75 7.3 Bo 7.62 11.95 18.3 Ko 4.2 5.22 6.7 W 16 24 32 P 8 12 12 t 0.36 0.36 0.4 Po 4 0.1 4 0.1 4 0.1 All other dimensions as per EIA481 standard Performance Data WSM1 Load at rated power: 1000 hrs @ 70C Dry heat Short term overload Derating from rated power @ 70C Moisture Temperature cycling Resistance to solder heat Isolation voltage Insulation resistance Substrate bend R% R% R% V ohms R% 1 0.001 1000 hrs @ 155C R% R% R% 2 0.001 2 0.001 WSM2 2 0.001 2 0.001 2 0.001 zero at 155C 1 0.001 1 0.001 1 0.001 1,000 >1000M 0.2 0.001 1.5 0.001 WSM3 3 0.001 3 0.001 Note: The power ratings to be applied depend upon the board used and the ambient temperature. (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 46 Issue C * 04.02 |
Price & Availability of WSM2
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