USR 2-T220B 500R0 S 0.1% Powertron

USR UNR 2-T220 T221 Powertron FEATURES Resistances from 0.5Ohm to 150kOhms Power Rating to 10Watt Resistance Tolerances to 0.01% TCR to 3ppm/K Load Stability to 0.01% TO-220 Housing TABLE 1SPECIFICATIONS USR 2-T220 UNR 2-T220 TYPE USR 2-T221 UNR 2-T221 Resistance Range 0.5 Ohms to 150 kOhms 0.5 Ohms to 5 kOhms Free air 70C R < 50R0 1.5W 1.5W R > 50R0 1.0W 1.0W Power Rating With heatsink R < 50R0 10W 15W R > 50R0 6W 10W Tolerances from 0.5 Ohms 0.1% / 0.25% / 0.5% / 1% from 10.0 Ohms 0.05% / 0.1% / 0.25% / 0.5% / 1% from 25.0 Ohms 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% from 50.0 Ohms 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% Thermal Resistance Rthj-c R<50R0 10.8 K/W 6.8 K/W R>50R0 18.8 K/W 10.8 K/W Stability (1000h) 0.01% 25ppm / R after 1 year Shelf Lifw Stability 50ppm / R after 3 year max. 5ppm/K (-55 to 155C) Temperature Coefficient typ. 3ppm/K (-55 to 125C) Voltage Proof 1 kVDC Thermal EMF < 0.1V/K Operating Temperature Range -55 to 155C Resistor Material NiCr-Foil Substrate Al O AlN 2 3 Housing Epoxy + Cu heatsink nickel plated Connector Material Cu / tinned Terminals 2 Max. Torque 1.0 Nm Specially designed for ap- Notes plications with fast changing electrical load ORDERING INFORMATION Part Number - Resistance - Contact - Tolerance - TCR (if not standard) UNR 2-T220B 4K700 C 0.5% Document No.: 64222 For technical questions, www.powertron.de Revision: 14-01-2014 contact powertron vishaypg.com 1USR UNR 2-T220 T221 Powertron FIGURE 1TEMPERATURE COEFFICIENT 200 100 Nominal Spread 0 2.3ppm/K -100 -200 -300 Nominal R/R -400 -500 Nominal Spread -600 2.3ppm/K -700 -75 -50 -25 0 25 50 75 100 125 150 Temperature (C) FIGURE 2DERATING Power Rating Notes - The U-Series Resistors must be attached to a suitable heat- sink. The maximum internal resistor temperature is 155C. 120 To specify an appropriate heatsink use the following formula : 100 80 R = T - ( P x R ) - T qH MAX qR A 60 P 40 Where: R = Thermal Resistance of Heatsink ( K/W ) qH 20 R = Thermal Resistance of Resistor ( K/W ) qR 0 T = Maximum Temperature of Resistor MAX 25 50 85 100 115 130 145 155 T = Ambient Temperature of Heatsink ( C ) A P = Power Through Resistor ( W ) Temperature of the backplate(C) www.powertron.de For technical questions, Document No.: 64222 2 contact powertron vishaypg.com Revision: 14-01-2014 Power (% from nominal power) R/R (ppm)