USR4-1414

USR 4-1414 • Highest Stability • Near Temperature Independency • Lowest Tolerances • Low Capacitance and Inductance • Customized Resistance Values SPECIFICATIONS ELECTRICAL Resistance Range Power Rating : : 0R5 ...100R 0.8 W without heatsink (70°C) 25 W with heatsink < 4.2 K/W Thermal Resistance Rthj-c : Tolerances from 0R5 from 1R Stability : : : : 0.1%, 0.25%, 0.5%, 1% 0.01%, 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 1.5 kVDC < 1 µV/K Temperature Coefficient : Voltage Proof Thermal EMF : : ENVIRONMENTAL Operating Temperature Range : -55°C...155°C NiCr-Foil Al2O3 (upon request AlN) Plastic + Epoxy Cu-tinned / 4-pin MECHANICAL Resistor Material Substrate Housing Connector Material : : : : 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 4-1414 TEMPERATURE COEFFICIENT 600 +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 100 pow er (% from nom inal pow er) without heatsink Power ( % from nominal power) 120 100 80 60 40 20 0 25 50 85 with heatsink 80 60 40 20 0 25 40 55 70 85 100 115 130 145 155 Ambient Temperature (°C) 100 115 130 145 155 Tem perature of the backplate (°C ) DIMENSIONS Dimensions in mm HOW TO ORDER USR 4-1414 1R5 0.1% TK3 USR 4-1414 0R1 0.1% TK3 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