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USR 4-1414
* Highest Stability * Near Temperature Independency * Lowest Tolerances * Low Capacitance and Inductance * Customized Resistance Values
SPECIFICATIONS ELECTRICAL
Resistance Range Power Rating : : 0R5 ...100R 0.8 W without heatsink (70C) 25 W with heatsink < 4.2 K/W
Thermal Resistance Rthj-c : Tolerances from 0R5 from 1R Stability : : : :
0.1%, 0.25%, 0.5%, 1% 0.01%, 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 1.5 kVDC < 1 V/K
Temperature Coefficient :
Voltage Proof Thermal EMF
: :
ENVIRONMENTAL
Operating Temperature Range : -55C...155C NiCr-Foil Al2O3 (upon request AlN) Plastic + Epoxy Cu-tinned / 4-pin
MECHANICAL
Resistor Material Substrate Housing Connector Material
: : : :
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 4-1414
TEMPERATURE COEFFICIENT
600 +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
100
pow er (% from nom inal pow er)
without heatsink
Power ( % from nominal power)
120 100 80 60 40 20 0 25 50 85
with heatsink
80 60 40 20 0 25 40 55 70 85 100 115 130 145 155 Ambient Temperature (C)
100
115
130
145
155
Tem perature of the backplate (C )
DIMENSIONS
Dimensions in mm
HOW TO ORDER USR 4-1414 1R5 0.1% TK3
USR 4-1414 0R1 0.1% 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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