USR UNR USS UNS T220 T221 Powertron * * * * * * * 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 70C (R<50R0) free air 70C (R>50R0) with heatsink (R<50R0) with heatsink (R>50R0) Thermal Resistance Rthj-c R<50R0 R>50R0 Tolerances from 0.5 Ohms from 10.0 Ohms from 25.0 Ohms from 50.0 Ohms USR / USS UNR /UNS 0.5 Ohms to 150 kOhms 0.5 Ohms to 5 kOhms 1.5W 1.0W 10W 6W 1.5W 1.0W 15W 10W 10.8 K/W 18.8 K/W 6.8 K/W 10.8 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% Stability 0.01% Shelf Life Stability 25ppm / R after 1 year 50ppm / R after 3 year Temperature Coefficient max. 5ppm/K (-55 to 155C) typ. 3ppm/K (-55 to 125C) Voltage Proof 1 kVDC Thermal EMF < 0.1V/K Operating Temperature Range -55 to 155C Resistor Material Substrate Housing NiCr-Foil Al2O3 AlN Epoxy + Cu heatsink nickel plated Connector Material Cu tinned Terminals 2 Max. Torque 1.0 Nm Notes Specially designed for applications with fast changing electrical load Ordering Information Part Number - Resistance - Contact - Tolerance - TCR UNR 2-T220B 5.7kOhms C 0.5% 3ppm Document Number: 64222 Revision: 20-09-10 For technical questions, contact: powertron@vishaypg.com www.powertron.de 1 USR UNR USS UNS T220 T221 Powertron SPECIFICATIONS (continued) Temperature Coefficient 1500 1000 +5ppm/K -5ppm/K DR/R (ppm) 500 0 Nominal Spread 2.3ppm/K +4,4 ppm/K -500 Nominal DR/R Nominal Spread 2.3ppm/K -1000 -1500 -50 0 -25 50 25 Temperature (C) 75 100 125 Derating Power (% from nominal power) Power Rating Notes - The U-Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155C. To specify an appropriate heatsink use the following formula : 120 100 80 40 RqH = TMAX - ( P x RqR ) - TA P 20 Where: 60 0 25 50 85 100 115 130 145 155 Temperature of the backplate(C) Dimensions 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 ) USS 2-T220 / UNS 2-T220 Dimension mm tol. (mm) inches tol. (inches) A 12.70 0.2 0.50 0.008 Dimension mm inches 0.008 A 12.10 0.476 11.16 0.439 B 10.16 0.2 0.40 C 0.76 0.1 0.03 0.004 B D 5.08 0.1 0.20 0.004 C 18.33 0.722 E 4.00 0.1 0.16 0.004 D 5.08 0.200 F 1.20 0.1 0.05 0.004 E 1.76 0.069 G 14.60 0.2 0.57 0.008 F 3.20 0.126 H 15.00 0.2 0.59 0.008 I 17.33 0.2 0.68 0.008 J 0.40 0.1 0.02 0.004 K 1.85 0.1 0.07 0.004 www.powertron.de 2 For technical questions, contact: powertron@vishaypg.com Document Number: 64222 Revision: 20-09-10 USR UNR USS UNS T220 T221 Powertron SPECIFICATIONS (continued) Dimensions USR 2-T220B / UNR 2-T220B USR 2-T221 / UNR 2-T221 USR 2-T220 / UNR 2-T220 Document Number: 64222 Revision: 20-09-10 Dimension mm tol. (mm) inches tol. (inches) A 17.30 0.2 0.68 0.008 B 10.16 0.2 0.40 0.008 C 6.00 0.1 0.24 0.004 D O3.7 0.1 O0.146 0.004 E 16.40 0.2 0.65 0.008 F 5.08 0.1 0.20 0.004 G 0.76 0.1 0.03 0.004 H 1.30 0.1 0.05 0.004 I 10.00 0.2 0.39 0.008 I (C-Contact) 13.80 0.2 0.54 0.008 J 2.00 0.1 0.08 0.004 K 1.20 0.1 0.05 0.004 L 4.00 0.1 0.16 0.004 M 2.90 0.1 0.11 0.004 N 0.40 0.1 0.02 0.004 O 1.85 0.1 0.07 0.004 Dimension mm tol. (mm) inches tol. (inches) A 18.30 0.2 0.72 0.008 B 10.16 0.2 0.40 0.008 C 3.70 0.1 0.15 0.004 D O3.2 0.1 O0.126 0.004 E 16.40 0.2 0.65 0.008 F 5.08 0.1 0.20 0.004 G 0.76 0.1 0.03 0.004 H 1.30 0.1 0.05 0.004 I 10.00 0.2 0.39 0.008 I (C-Contact) 13.80 0.2 0.54 0.008 J 2.00 0.1 0.08 0.004 K 1.20 0.1 0.05 0.004 L 4.00 0.1 0.16 0.004 M 3.90 0.1 0.15 0.004 N 0.40 0.1 0.02 0.004 O 1.85 0.1 0.07 0.004 Dimension mm tol. (mm) inches tol. (inches) A 15.30 0.2 0.60 0.008 B 10.00 0.2 0.39 0.008 C 2.80 0.1 0.11 0.004 D O3.7 0.1 O0.146 0.004 E 2.00 0.1 0.08 0.004 F 5.08 0.1 0.20 0.004 G 1.27 0.1 0.05 0.004 H 4.60 0.1 0.18 0.004 I 6.00 0.2 0.24 0.008 J 35.30 2.0 1.39 0.079 K O0.6 0.1 O0.02 0.004 L 2.41 0.1 0.09 0.004 For technical questions, contact: powertron@vishaypg.com www.powertron.de 3 Legal Disclaimer Notice Vishay Precision Group Disclaimer ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE. Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay Precision Group"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. The product specifications do not expand or otherwise modify Vishay Precision Group's terms and conditions of purchase, including but not limited to, the warranty expressed therein. 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Document No.: 63999 Revision: 27-Apr-11 www.vishaypg.com 1