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| USR UNR 2-T220 / T220B / T221 USS UNS 2-T220 PrecisionFoilResistors * * * * * * * 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 ResistanceRange Powerrating freeair70C(R<50R0) freeair70C(R>50R0) withheatsink(R<50R0) withheatsink(R>50R0) ThermalResistanceRthj-c R<50R0 R>50R0 Tolerances from0.5Ohms from10.0Ohms from25.0Ohms from50.0Ohms Stability ShelfLifeStability Temperature Coefficient VoltageProof ThermalEMF OperatingTemperatureRange ResistorMaterial Substrate Housing ConnectorMaterial Terminals Max.Torque Notes Al2O3 Epoxy+Cuheatsinknickelplated Cutinned 2 1.0Nm Specially designed for applications with fast changingelectricalload USR / USS 0.5Ohmsto150kOhms 1.5W 1.0W 10W 6W 10.8K/W 18.8K/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(-55to155C) typ.3ppm/K(-55to125C) 1kVDC <0.1V/K -55to155C NiCr-Foil UNR /UNS 0.5Ohmsto5kOhms 1.5W 1.0W 15W 10W 6.8K/W 10.8K/W AlN Ordering Information PartNumber-Resistance-Contact-Tolerance-TCR UNR2-T220B5.7kOhmsC0.5%3ppm Riedon Inc. 300CypressAvenue AlhambraCA91801 www.riedon.com (626)284-9901 (626)284-1704 Page124 rev.03/2006A USRUNR 2-T220/T220B/T221 USSUNS 2-T220 PrecisionFoilResistors 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 NominalSpread 2.3ppm/K NominalSpread 2.3ppm/K Temperature(C) Derating Power(%from nominalpower) 120 100 80 60 40 20 0 25 50 85 100 115 130 145 155 PowerRatingNotes- TheU-SeriesResistorsmustbeattachedtoasuitableheatsink. Themaximuminternalresistortemperatureis155C. Tospecifyanappropriateheatsinkusethefollowingformula: RqH=TMAX-(PxRqR)-TA P Where: Temperatureofthebackplate(C) RqH=ThermalResistanceofHeatsink(K/W) RqR=ThermalResistanceofResistor(K/W) TMAX=MaximumTemperatureofResistor TA=AmbientTemperatureofHeatsink(C) P=PowerThroughResistor(W) Dimensions USS2-T220/UNS2-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. 300CypressAvenue AlhambraCA91801 www.riedon.com (626)284-9901 (626)284-1704 Page125 rev.03/2006A USRUNR 2-T220/T220B/T221 USSUNS 2-T220 PrecisionFoilResistors SPECIFICATIONS (continued) Dimensions Dimension mm 17.30 10.16 6.00 O3.7 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 O0.146 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 USR2-T220B/UNR2-T220B A B C D E F G H I I(C-Contact) J K L M N O USR2-T221/UNR2-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 O3.2 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 O0.126 0.65 0.20 0.03 0.05 0.39 0.54 0.08 0.05 0.16 0.15 0.02 0.07 USR2-T220/UNR2-T220 Dimension A B C D E F G H I J K L mm 15.30 10.00 2.80 O3.7 2.00 5.08 1.27 4.60 6.00 35.30 O0.6 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 O0.146 0.08 0.20 0.05 0.18 0.24 1.39 O0.02 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. 300CypressAvenue AlhambraCA91801 www.riedon.com (626)284-9901 (626)284-1704 Page126 rev.03/2006A |
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