USR 4-3425 0R500 D 1% Powertron

USR UNR 4-3425 FEATURES Resistances from 0.05Ohm to 500Ohms Power Rating to 50Watt Resistance Tolerances to 0.01% TCR to 1ppm/K Load Stability to 0.01% TABLE 1SPECIFICATIONS TYPE USR 4-3425 UNR 4-3425 0.05 to 650 Ohms Resistance Range other resistance values upon request / power rating depending on resistance value Free air 70C 3W (available with heat sink on backside: 5W) Power Rating With heatsink 30W 50W Tolerances from 0.05 Ohms 0.1% / 0.25% / 0.5% / 1% from 10.0 Ohms 0.05% / 0.1% / 0.25% / 0.5% / 1% from 50.0 Ohms 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% Thermal Resistance 3.5 K/W 2.1 K/W Stability (1000h) 0.01% 25ppm / R after 1 year Shelf Life Stability 50ppm / R after 3 years max. 5ppm/K (-55 to 155C) typ. 3ppm/K (-55 to 125C) Temperature Coefficient typ. 1ppm/K (25 to 60C) upon request 1ppm/K (0 to 60C) Voltage Proof 750 VDC Maximum Current 15A Thermal EMF < 0.1V/K Operating Temperature Range -55 to 155C Resistor Material NiCr-Foil Substrate Al O AlN 2 3 Housing Epoxy + Al-heatsink Connector Material Cu / tinned Terminals 4 (standard contact D) Max. Torque 1 Nm Specially designed for ap- Notes plications with fast changing electrical load ORDERING INFORMATION Part Number - Resistance - Contact - Tolerance - TCR (if not standard) USR 4-3425 10R000 D 0.5% 1ppm/K (0 to 60C) Document No.: 64223 For technical questions, www.powertron.de Revision: 03-05-2016 contact powertron vpgsensors.com 1USR UNR 4-3425 FIGURE 1TEMPERATURE COEFFICIENT 200 100 Nominal Spread 0 2.3ppm/K -100 -200 -300 Nominal R/R -400 -500 Nominal Spread -600 2.3ppm/K -700 -75 -50 -25 0 25 50 75 100 125 150 Temperature (C) FIGURE 2DERATING Power Rating Notes - The U-Series Resistors must be attached to a suitable heatsink. The maximum internal resistor temperature is 155C. 120 To specify an appropriate heatsink use the following formula : 100 80 R = T - ( P x R ) - T qH MAX qR A 60 P 40 Where: R = Thermal Resistance of Heatsink ( K/W ) qH 20 R = Thermal Resistance of Resistor ( K/W ) qR 0 T = Maximum Temperature of Resistor MAX T = Ambient Temperature of Heatsink ( C ) 25 50 85 100 115 130 145 155 A P = Power Through Resistor ( W ) Temperature of the backplate(C) FIGURE 3DIMENSIONS in mm (inches) Dimension A 2.0 (0.079) 50.00 (1.97) B 0.3 (0.012) 34.00 (1.34) C 0.2 (0.008) 25.00 (0.98) D 0.2 (0.008) 10.00 (0.39) E 0.1 (0.004) 5.00 (0.20) F 0.2 (0.008) 17.80 (0.70) G 0.1 (0.004) 3.50 (0.14) H 0.1 (0.004) 0.8 (0.031) I 0.2 (0.008) 27.50 (1.08) J 0.2 (0.008) 17.50 (0.69) K 0.1 (0.004) 2.00 (0.08) L 0.1 (0.004) 4.50 (0.18) M 0.2 (0.008) 3.00 (0.12) www.powertron.de For technical questions, Document No.: 64223 2 contact powertron vpgsensors.com Revision: 03-05-2016 Power (% from nominal power) R/R (ppm)