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| USR UNR 4-4020 * Nearly Temperature Independent * Minimum Tolerance * Low Capacity and Inductance * Customized Resistor Values * Highest Stability SPECIFICATIONS ELEKTRICAL Resistance Range : USR 4-4020 UNR 4-4020 note1) Power Rating : 0R05 ... 500R 0R05 ... 500R other resistance values upon request / power rating depending on resistor value 2.5 W (70C) without heatsink 30 W* 50 W* * with heatsink 3.6 K/W 2.2 K/W Thermal Resistance Rthj-c : Tolerances from 0R05 from 10R from 50R Stability : : : : : 0.1%, 0.25%, 0.5%, 1% 0.05%, 0.1%, 0.25%, 0.5%, 1% 0.01%, 0.02%, 0.05%, 0.1%, 0.25%, 0.5%, 1% 0.01% max. 5 ppm/K (-55...155)C typ. 3 ppm/K (-55...125)C upon request 1 ppm/K (0...60)C 750 VDC 15 A <1 V/K Temperature Coefficient : Voltage Proof Max. Current Thermal EMF : : : 15 A ENVIRONMENTAL Operating Temperature Range : -55C...155C : NiCr-Foil Substrate : Al2O3 Housing : Epoxy + Al-heatsink Connector Material : Cu, tinned, 4-pin Max. torque backplate : 1.0 Nm note1): Specially designed for applications with fast changing electrical load. MECHANICAL Resistor Material AlN Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk USR UNR 600 4-4020 TEMPERATURE COEFFICIENT +5 ppm/K 400-5 ppm/K dR/R (ppm ) 200 0 +2,2 ppm/K -200 -400 -600 -50 -25 0 25 50 75 Tem perature (C) -1,8 ppm/K No minal-dR/R No minal-Spread +/-2,3 ppm/K No minal-Spread +/-2,3 ppm/K 100 125 DERATING CURVE 120 Power ( % from nominal power) 100 80 60 40 20 0 25 50 85 100 115 130 145 155 Temperature of the backplate (C) DIMENSIONS from R 0R1 leads with d=0.8mm Dimensions in mm HOW TO ORDER USR 4-4020 0R3 D 0.25% TK3 UNR 4-4020 50R D 0.01% TK1 Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk |
Price & Availability of UNR4-4020
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