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| USR UNR 4-T220 / T220B USS UNS 4-T220 PrecisionShuntResistors * * * * * 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 ResistanceRange Powerrating freeair70C withheatsink ThermalResistanceRthj-c Tolerances from0.5Ohms from10.0Ohms from50.0Ohms Stability ShelfLifeStability Temperature Coefficient 1.5W 10W 10.8K/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(-55to155C) typ.3ppm/K(-55to125C) uponrequest1ppm/K(0to60C) 1kVDC <0.1V/K -55to155C NiCr-Foil Al2O3 Epoxy+Cuheatsinknickelplated Cutinned 4 1.0Nm Specially designed for applications with fast changingelectricalload AlN USR / USS 0.2to80Ohms UNR /UNS 1.5W 15W 6.8K/W VoltageProof ThermalEMF OperatingTemperatureRange ResistorMaterial Substrate Housing ConnectorMaterial Terminals Max.Torque Notes 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 Page132 rev.03/2006A USRUNR 4-T220/T220B USSUNS 4-T220 PrecisionShuntResistors 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 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) Dimensions USS4-T220/UNS4-T220 RqH=ThermalResistanceofHeatsink(K/W) RqR=ThermalResistanceofResistor(K/W) TMAX=MaximumTemperatureofResistor TA=AmbientTemperatureofHeatsink(C) P=PowerThroughResistor(W) 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. 300CypressAvenue AlhambraCA91801 www.riedon.com (626)284-9901 (626)284-1704 Page133 rev.03/2006A USRUNR 4-T220/T220B USSUNS 4-T220 PrecisionShuntResistors SPECIFICATIONS (continued) Dimensions USR4-T220B/UNR4-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 O3.7 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 O0.146 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 USR4-T220/UNR4-T220 Dimension A B C D E F G H I J K L mm 15.30 10.00 2.80 O3.7 2.54 7.62 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 0.10 0.30 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 Page134 rev.03/2006A |
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