USR4-3825

USR UNR 4-3425 3825 3825H 4020 Precision Shunt Resistors • • • • • 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 Resistance Range Power rating free air 70°C for 3825H with heatsink Thermal Resistance Rthj-c Tolerances from 0.05 Ohms from 10.0 Ohms from 50.0 Ohms Stability Shelf Life Stability Temperature Coefficient USR 43425 3825 USR 44020 0.05 to 500 Ohms UNR 43425 3825 UNR 44020 0.05 to 400 Ohms other resistance values upon request / power rating depending on resistance value 3 W 5 W 30 W 3.5 K/W 2.5 W 30 W 3.6 K/W 3 W 5 W 50 W 2.1 K/W 2.5 W 50 W 2.2 K/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 (-55 to 155°C) typ. ±3ppm/K (-55 to 125°C) upon request ±1ppm/K (0 to 60°C) 750 VDC 15 A < 0.1µV/K -55 to 155°C NiCr-Foil Al2O3 Epoxy + Al-heatsink Cu tinned 4 1.0 Nm Specially designed for applications with fast changing electrical load AlN Voltage Proof max. Current Thermal EMF Operating Temperature Range Resistor Material Substrate Housing Connector Material Terminals Max. Torque Notes Ordering Information Part Number - Resistance - Contact - Tolerance - TCR USR 4-3825H 10Ohms D 0.5% 3ppm Powertron GmbH Potsdamer Strasse 18a D-14513 Teltow +49 (0)3328 3530-0 A Riedon Company www.powertron.de +49 (0)3328 3530-15 Page 127 rev. 03/2006A USR UNR 4-3425 3825 3825H 4020 Precision Shunt Resistors 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 Spread ±2.3ppm/K Nominal ∆R/R 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 USR 4-3425 / UNR 4-3425 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 Ø3.50 Ø0.8 27.50 17.50 2.00 5.50 3.00 inches 1.97 1.34 0.98 0.39 0.20 0.70 Ø0.14 Ø0.031 1.08 0.69 0.08 0.22 0.12 Powertron GmbH Potsdamer Strasse 18a D-14513 Teltow +49 (0)3328 3530-0 A Riedon Company www.powertron.de +49 (0)3328 3530-15 Page 128 rev. 03/2006A USR UNR 4-3425 3825 3825H 4020 Precision Shunt Resistors SPECIFICATIONS (continued) USR 4-3825 / UNR 4-3825 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° Ø0.8 27.50 17.50 Ø3.2 2.00 5.50 15.00 3.00 inches 1.93 1.50 0.94 0.16 1.34 0.69 0.6x45° Ø0.031 1.08 0.69 Ø0.126 0.08 0.22 0.59 0.12 USR 4-3825H / UNR 4-3825H 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° Ø0.8 27.50 17.50 Ø3.2 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° Ø0.031 1.08 0.69 Ø0.126 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 USR 4-4020 / UNR 4-4020 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 Ø3.80 Ø0.8 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 Ø0.15 Ø0.031 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 Potsdamer Strasse 18a D-14513 Teltow +49 (0)3328 3530-0 A Riedon Company www.powertron.de +49 (0)3328 3530-15 Page 129 rev. 03/2006A