USS 2-T220 USS 4-T220 • • • • • Power Rating up to 10 Watt Highest Stability Near Temperature Independency Lowest Tolerances Low Capacitance and Inductance SPECIFICATIONS ELECTRICAL USS 2-T220 USS 4-T200 0R5 ... 80R Resistance Range : 0R5 ... 150k Power Rating : 1.5 W (70°C) without heatsink 10 W * * with heatsink Thermal Resistance Rthj-c : 10.8 K/W Tolerance from 0R5 from 10R from 50R : : : : 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% Stability : 0.01% Temperature Coefficient : max. ±5 ppm/K (-55...155)°C typ. ±3 ppm/K (-55...125)°C Insolation Resistance : 1 kVDC Thermal EMF : < 1 µV/K : -55°C...155°C : : : : NiCr-Foil Al2O3 mounted on nickelt Copperplate PPS Cu tinned ENVIRONMENTAL Operating Temperature Range MECHANICAL Resistor Material Substrate Housing Connectors Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk USS 2-T220 USS 4-T220 TEMPERATURE COEFFICIENT 600 +5 ppm/K dR/R (ppm ) 400-5 ppm/K 200 No minal-Spread +/-2,3 ppm/K 0 +2,2 ppm/K -200 -1,8 ppm/K No minal-dR/R -400 No minal-Spread +/-2,3 ppm/K -600 -50 -25 0 25 50 75 100 125 Tem perature (°C) DERATING CURVE Power ( % from nominal power) 120 100 80 60 40 20 0 25 50 85 100 115 130 145 155 Temperature of the backplate (°C) DIMENSIONS USS 2-T220 USS 4-T220 Dimensions in mm HOW TO ORDER USS 2-T220 15R4 D 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 [email protected] web www.willow.co.uk