UNR2-T221

USR UNR 2-T220 / T220B / T221 USS UNS 2-T220 Precision Foil Resistors • • • • • • • 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 Convenient SMD D2Pak Available SPECIFICATIONS Type Resistance Range Power rating free air 70°C (R50R0) with heatsink (R50R0) Thermal Resistance Rthj-c R50R0 Tolerances from 0.5 Ohms from 10.0 Ohms from 25.0 Ohms from 50.0 Ohms Stability Shelf Life Stability Temperature Coefficient Voltage Proof Thermal EMF Operating Temperature Range Resistor Material Substrate Housing Connector Material Terminals Max. Torque Notes Al2O3 Epoxy + Cu heatsink nickel plated Cu tinned 2 1.0 Nm Specially designed for applications with fast changing electrical load USR / USS 0.5 Ohms to 150 kOhms 1.5W 1.0W 10W 6W 10.8 K/W 18.8 K/W 0.1% / 0.25% / 0.5% / 1% 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.02% / 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) 1 kVDC < 0.1µV/K -55 to 155°C NiCr-Foil UNR /UNS 0.5 Ohms to 5 kOhms 1.5W 1.0W 15W 10W 6.8 K/W 10.8 K/W AlN 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 124 rev. 03/2006A USR UNR 2-T220 / T220B / T221 USS UNS 2-T220 Precision Foil Resistors SPECIFICATIONS (continued) 800 600 -5ppm/K Temperature Coefficient +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 2-T220 / UNS 2-T220 Dimension A B C D E F G H I J K mm 12.70 10.16 0.76 5.08 4.00 1.20 14.60 15.00 17.33 0.40 1.85 tol. (±mm) 0.2 0.2 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.1 0.1 inches 0.50 0.40 0.03 0.20 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 0.008 0.008 0.008 0.004 0.004 Dimension A B C D E F mm 12.10 11.16 18.33 5.08 1.76 3.20 inches 0.476 0.439 0.722 0.200 0.069 0.126 Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 www.riedon.com (626) 284-9901 (626) 284-1704 Page 125 rev. 03/2006A USR UNR 2-T220 / T220B / T221 USS UNS 2-T220 Precision Foil Resistors SPECIFICATIONS (continued) Dimensions Dimension mm 17.30 10.16 6.00 Ø3.7 16.40 5.08 0.76 1.30 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 0.1 0.1 0.1 0.2 0.2 0.1 0.1 0.1 0.1 0.1 0.1 tol. (±mm) 0.2 0.2 0.1 0.1 0.2 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 0.20 0.03 0.05 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 0.004 0.004 0.004 0.008 0.008 0.004 0.004 0.004 0.004 0.004 0.004 tol. (±inches) 0.008 0.008 0.004 0.004 0.008 0.004 0.004 0.004 0.008 0.008 0.004 0.004 0.004 0.004 0.004 0.004 USR 2-T220B / UNR 2-T220B A B C D E F G H I I (C-Contact) J K L M N O USR 2-T221 / UNR 2-T221 Dimension A B C D E F G H I I (C-Contact) J K L M N O mm 18.30 10.16 3.70 Ø3.2 16.40 5.08 0.76 1.30 10.00 13.80 2.00 1.20 4.00 3.90 0.40 1.85 inches 0.72 0.40 0.15 Ø0.126 0.65 0.20 0.03 0.05 0.39 0.54 0.08 0.05 0.16 0.15 0.02 0.07 USR 2-T220 / UNR 2-T220 Dimension A B C D E F G H I J K L mm 15.30 10.00 2.80 Ø3.7 2.00 5.08 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 0.08 0.20 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 126 rev. 03/2006A