Semi-Precision Power Wirewound Resistors Welwyn Components PPW Series * Ideal for pulse and surge applications * 2 watts to 15 watts * Resistance to 0R1 ohms to 5K ohms * 3%, 2% or 1% tolerance * 20 ppm/C TCR Electrical Data PPW-2 PPW-3 PPW-5 PPW-7 PPW-10 2 3 5 7 10 Power rating at 25C watts Resistance range ohms 0R1 to 1K6 0R1 to 1K6 0R1 to 1K6 0R1 to 2K5 0R1 to 5K PPW-15 15 0R1 to 5K Please note: When ordering the alternate configuration please add an `A' after the part number (ie. PPW-3A) Lighting Surge Capabilities for PPW-2 Resistive range 10 x 1000* 10 x 360* 1R to 9R9 ohms 250V 650V 10R to 29R9 500V 850V 30R to 99R 600V 1000V 100R to 1K6 1000V 1500V 1000V 500V 600V 300V 1000 2000 3000 1000 Volts 10x360sec 1000 2000 3000 600 Volts 10x1000sec *10 microseconds - Maximum rise time to peak voltage. 360 or 1000 microseconds - minimum decay time to one half peak. 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 (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 Issue B * 03.02 115 Semi-Precision Power Wirewound Resistors Welwyn Components PPW Series Physical Data Dimensions (mm) Standard Configuration Alternate Configuration W d E H 25.4 min L Type 3.17 max. L 0.8 W 0.8 H 0.8 d dia. E 0.8 PPW-2 1705 6.99 6.99 0.8 8.134 PPW-3 22.3 7.87 7.87 0.8 9.65 PPW-5 22.3 9.65 8.89 0.8 10.4 PPW-7 35.3 9.65 8.89 0.8 11.9 PPW-10 47.7 9.65 8.89 0.8 11.9 PPW-15 47.7 12.7 12.7 0.8 12.7 Power Derating 250 PPW-15 100 200 PPW-10 80 150 PPW-7 PPW-5 PPW-3 60 100 PPW-2 50 0 0 20 40 60 80 % Rated Load Hot Spot Temperature (C) Temperature Rise % Rated Load 65 PPW-2 PPW-3, 5, 7, 10 PPW-15 150 40 Max. Recommended Ambient Operating Temperature 150C 20 0 100 120 25 40 0 50 100 150 200 Ambient Temperature (C) 250 Ordering Procedure Example: PPW5 at 110 ohms and 1% tolerance in bulk pack - PPW5- 110RFI Type Configuration A Standard Alternate Value (use IEC62 code) Tolerance (use IEC62 code) F G 1% 2% H 3% Note: 1 & 3% preferred Packing I Bulk Standard (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 116 Issue B * 03.02