USR4-3425 Datasheet, PDF (1/2 Pages) Willow Technologies Ltd – High Stability Near Temperature Independency

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
Power Rating
:
3 W (70°C) without heatsink
5 W (20°C) for 3825H
30 W*
50 W*
* with heatsink
Thermal Resistance Rthj-c :
3.5 K/W
2.1 K/W
Tolerances
from 0R05
from 10R
from 50R
:
:
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%
Stability
:
0.01%
Temperature Coefficient :
max. ±5 ppm/K (-55...155)°C
typ. ±3 ppm/K (-55...125)°C
upon request ±1 ppm/K (0...60)°C
Voltage Proof
Max. Current
Thermal EMF
:
750 VDC
:
15 A
:
< 1 µV/K
ENVIRONMENTAL
Operating Temperature Range :
-55°C...155°C
MECHANICAL Resistor Material
:
Substrate
:
Housing
:
Connector Material
:
Max. torque backplate :
NiCr-Foil
Al₂O₃
AlN
Epoxy + heatsink aluminium
Cu, tinned, 4-pin
1.0 Nm
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 [e-mail] web www.willow.co.uk