UNS4-T220

USR UNR 4-T220 / T220B USS UNS 4-T220 Precision Shunt Resistors • • • • • Resistances from 0.2Ohm to 80Ohms Power Rating to 15Watt Resistance Tolerances to ±0.01% TCR to ±1ppm/K Load Stability to 0.01% SPECIFICATIONS Type Resistance Range Power rating free air 70°C with heatsink Thermal Resistance Rthj-c Tolerances from 0.5 Ohms from 10.0 Ohms from 50.0 Ohms Stability Shelf Life Stability Temperature Coefficient 1.5W 10W 10.8 K/W 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% 25ppm / ∆R after 1 year 50ppm / ∆R after 3 year max. ±5ppm/K (-55 to 155°C) typ. ±3ppm/K (-55 to 125°C) upon request ±1ppm/K (0 to 60°C) 1 kVDC < 0.1µV/K -55 to 155°C NiCr-Foil Al2O3 Epoxy + Cu heatsink nickel plated Cu tinned 4 1.0 Nm Specially designed for applications with fast changing electrical load AlN USR / USS 0.2 to 80 Ohms UNR /UNS 1.5W 15W 6.8 K/W Voltage Proof Thermal EMF Operating Temperature Range Resistor Material Substrate Housing Connector Material Terminals Max. Torque Notes Ordering Information Part Number - Resistance - Contact - Tolerance - TCR UNR 2-T220B 5.7kOhms C 0.5% 3ppm Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 132 rev. 03/2006A USR UNR 4-T220 / T220B USS UNS 4-T220 Precision Shunt Resistors SPECIFICATIONS (continued) Temperature Coefficient 800 600 +5ppm/K -5ppm/K ∆R/R (ppm) 400 200 0 -200 -400 -600 -800 -50 -25 0 25 50 75 100 125 Nominal ∆R/R Nominal Spread ±2.3ppm/K Nominal Spread ±2.3ppm/K Temperature (°C) Derating Power (% from nominal power) 120 100 80 60 40 20 0 25 50 85 100 115 130 145 155 Power Rating Notes - The U-Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155°C. To specify an appropriate heatsink use the following formula : RqH = TMAX - ( P x RqR ) - TA P Where: RqH = Thermal Resistance of Heatsink ( K/W ) RqR = Thermal Resistance of Resistor ( K/W ) TMAX = Maximum Temperature of Resistor TA = Ambient Temperature of Heatsink ( °C ) P = Power Through Resistor ( W ) Temperature of the backplate(°C) Dimensions USS 4-T220 / UNS 4-T220 Dimension A B C D E F G H I J K L Dimension A B C D E F G mm 12.70 10.16 0.76 2.54 7.62 4.00 1.20 14.60 15.00 17.33 0.40 1.85 mm 12.10 11.16 18.33 7.62 2.54 1.76 3.20 tol. (±mm) 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.1 0.1 inches 0.476 0.439 0.722 0.300 0.100 0.069 0.126 inches 0.50 0.40 0.03 0.10 0.30 0.16 0.05 0.57 0.59 0.68 0.02 0.07 tol. (±inches) 0.008 0.008 0.004 0.004 0.004 0.004 0.004 0.008 0.008 0.008 0.004 0.004 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 133 rev. 03/2006A USR UNR 4-T220 / T220B USS UNS 4-T220 Precision Shunt Resistors SPECIFICATIONS (continued) Dimensions USR 4-T220B / UNR 4-T220B Dimension A B C D E F G H I J K K (C-Contact) L M N O P Q mm 17.30 10.16 6.00 Ø3.7 16.40 7.62 2.54 1.30 0.76 1.03 10.00 13.80 2.00 1.20 4.00 2.90 0.40 1.85 tol. (±mm) 0.2 0.2 0.1 0.1 0.2 0.2 0.1 0.1 0.1 0.1 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.1 inches 0.68 0.40 0.24 Ø0.146 0.65 0.30 0.10 0.05 0.03 0.04 0.39 0.54 0.08 0.05 0.16 0.11 0.02 0.07 tol. (±inches) 0.008 0.008 0.004 0.004 0.008 0.008 0.004 0.004 0.004 0.004 0.008 0.008 0.004 0.004 0.004 0.004 0.004 0.004 USR 4-T220 / UNR 4-T220 Dimension A B C D E F G H I J K L mm 15.30 10.00 2.80 Ø3.7 2.54 7.62 1.27 4.60 6.00 35.30 Ø0.6 2.41 tol. (±mm) 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.1 0.2 2.0 0.1 0.1 inches 0.60 0.39 0.11 Ø0.146 0.10 0.30 0.05 0.18 0.24 1.39 Ø0.02 0.09 tol. (±inches) 0.008 0.008 0.004 0.004 0.004 0.004 0.004 0.004 0.008 0.079 0.004 0.004 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 134 rev. 03/2006A