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 USR UNR 4-3425 4-3825 4-3825H
* High Stability * Near Temperature Independency * Lowest Tolerances * Low Capacitance and Inductance * Customized Resistance Values
SPECIFICATIONS ELECTRICAL
Resistance Range :
USR 4-3425/3825 UNR 4-3425/3825 with addional heatsink 3825H
note1)
0R05 ... 500R 0R05 ... 500R other resistance values upon request / power rating depending on resistor value 3 W (70C) without heatsink 5 W (20C) for 3825H 30 W* 50 W* * with heatsink 3.5 K/W 2.1 K/W
Power Rating
:
Thermal Resistance Rthj-c : Tolerances from 0R05 from 10R from 50R Stability : : : : :
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% max. 5 ppm/K (-55...155)C typ. 3 ppm/K (-55...125)C upon request 1 ppm/K (0...60)C 750 VDC 15 A < 1 V/K
Temperature Coefficient :
Voltage Proof Max. Current Thermal EMF
: : :
ENVIRONMENTAL
Operating Temperature Range : : : : : : -55C...155C NiCr-Foil Al2O3 AlN Epoxy + heatsink aluminium Cu, tinned, 4-pin 1.0 Nm
MECHANICAL Resistor Material
Substrate Housing Connector Material Max. torque backplate
note1): Specially designed for applications with fast changing electrical load.
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk
USR UNR
600
4-3425 4-3825 4-3825H
TEMPERATURE COEFFICIENT
+5 ppm/K 400-5 ppm/K dR/R (ppm ) 200 0 +2,2 ppm/K -200 -400 -600 -50 -25 0 25 50 75 Tem perature (C) -1,8 ppm/K
No minal-dR/R No minal-Spread +/-2,3 ppm/K No minal-Spread +/-2,3 ppm/K
100
125
DERATING CURVE
Power ( % from nominal power)
120 100 80 60 40 20 0 25 50 85 100 115 130 145 155 Temperature of the backplate (C)
DIMENSIONS
USR/UNR 4-3425
USR/UNR 4-3825 and 4-3825H
Dimensions in mm
HOW TO ORDER UNR 4-3425 1R0 D 0.1% TK1
USR 4-3825 10R D 0.5% TK3
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail sales@willow.co.uk web www.willow.co.uk


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