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| USR UNR 4-3425 3825 3825H 4020 PrecisionShuntResistors * * * * * Resistances from 0.05Ohm to 500Ohms Power Rating to 50Watt Resistance Tolerances to 0.01% TCR to 1ppm/K Load Stability to 0.01% SPECIFICATIONS Type ResistanceRange Powerrating freeair70C for3825H withheatsink ThermalResistanceRthj-c Tolerances from0.05Ohms from10.0Ohms from50.0Ohms Stability ShelfLifeStability Temperature Coefficient USR 43425 3825 USR 44020 0.05to500Ohms UNR 43425 3825 UNR 44020 0.05to400Ohms otherresistancevaluesuponrequest/powerratingdependingonresistancevalue 3W 5W 30W 3.5K/W 2.5W 30W 3.6K/W 3W 5W 50W 2.1K/W 2.5W 50W 2.2K/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) 750VDC 15A <0.1V/K -55to155C NiCr-Foil Al2O3 Epoxy+Al-heatsink Cutinned 4 1.0Nm Specially designed for applications with fast changingelectricalload AlN VoltageProof max.Current ThermalEMF OperatingTemperatureRange ResistorMaterial Substrate Housing ConnectorMaterial Terminals Max.Torque Notes Ordering Information PartNumber-Resistance-Contact-Tolerance-TCR USR4-3825H10OhmsD0.5%3ppm Powertron GmbH PotsdamerStrasse18a D-14513Teltow +49(0)33283530-0 ARiedonCompany www.powertron.de +49(0)33283530-15 Page127 rev.03/2006A USRUNR 4-342538253825H4020 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 NominalSpread 2.3ppm/K Nominal R/R 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 USR4-3425/UNR4-3425 tol. (mm) 2.0 0.3 0.2 0.2 0.1 0.2 0.1 0.1 0.2 0.2 0.1 0.1 0.2 tol. (inches) 0.079 0.012 0.008 0.008 0.004 0.008 0.004 0.004 0.008 0.008 0.004 0.004 0.008 Dimension A B C D E F G H I J K L M mm 50.00 34.00 25.00 10.00 5.00 17.80 O3.50 O0.8 27.50 17.50 2.00 5.50 3.00 inches 1.97 1.34 0.98 0.39 0.20 0.70 O0.14 O0.031 1.08 0.69 0.08 0.22 0.12 Powertron GmbH PotsdamerStrasse18a D-14513Teltow +49(0)33283530-0 ARiedonCompany www.powertron.de +49(0)33283530-15 Page128 rev.03/2006A USRUNR 4-342538253825H4020 PrecisionShuntResistors SPECIFICATIONS (continued) USR4-3825/UNR4-3825 tol. (mm) 2.0 0.3 0.2 0.1 0.3 0.2 0.1 0.1 0.2 0.2 0.1 0.1 0.1 0.2 0.2 tol. (inches) 0.079 0.012 0.008 0.004 0.012 0.008 0.004 0.004 0.008 0.008 0.004 0.004 0.004 0.008 0.008 Dimension A B C D E F G H I J K L M N O mm 49.00 38.00 24.00 4.00 34.00 17.50 1.5x45 O0.8 27.50 17.50 O3.2 2.00 5.50 15.00 3.00 inches 1.93 1.50 0.94 0.16 1.34 0.69 0.6x45 O0.031 1.08 0.69 O0.126 0.08 0.22 0.59 0.12 USR4-3825H/UNR4-3825H Dimension A B C D E F G H I J K L M N O P mm 49.00 38.00 24.00 4.00 34.00 17.50 1.5x45 O0.8 27.50 17.50 O3.2 2.00 max.10.3 15.00 3.00 19.00 tol. (mm) 2.0 0.3 0.2 0.1 0.3 0.2 0.1 0.1 0.2 0.2 0.1 0.1 0.2 0.2 0.2 0.2 inches 1.93 1.50 0.94 0.16 1.34 0.69 0.6x45 O0.031 1.08 0.69 O0.126 0.08 max.0.4 0.59 0.12 0.75 tol. (inches) 0.079 0.012 0.008 0.004 0.012 0.008 0.004 0.004 0.008 0.008 0.004 0.004 0.008 0.008 0.008 0.008 USR4-4020/UNR4-4020 Dimension A B C D E F G H I J K L M mm 45.40 40.00 20.00 10.00 30.00 20.00 O3.80 O0.8 5.08 15.24 3.00 7.00 4.00 tol. (mm) 2.0 0.3 0.2 0.2 0.2 0.2 0.1 0.1 0.1 0.2 0.1 0.1 0.1 inches 1.79 1.57 0.79 0.39 1.18 0.79 O0.15 O0.031 0.20 0.60 0.12 0.28 0.16 tol. (inches) 0.079 0.012 0.008 0.008 0.008 0.008 0.004 0.004 0.004 0.008 0.004 0.004 0.004 Powertron GmbH PotsdamerStrasse18a D-14513Teltow +49(0)33283530-0 ARiedonCompany www.powertron.de +49(0)33283530-15 Page129 rev.03/2006A |
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