USR UNR 4-3425 4-3825 4-3825H

••••• High Stability

••••• Near Temperature

Independency

••••• Lowest Tolerances

••••• Low Capacitance and

Inductance

••••• Customized Resistance

Values

SPECIFICATIONS

ELECTRICAL

USR 4-3425/3825

UNR 4-3425/3825

with addional heatsink 3825H

Resistance Range

:

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

:

0.1%, 0.25%, 0.5%, 1%

from 10R

:

0.05%, 0.1%, 0.25%, 0.5%, 1%

from 50R

:

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

:

750 VDC

Max. Current

:

15 A

Thermal EMF

:

< 1 µV/K

ENVIRONMENTAL

Operating Temperature Range

:

-55°C...155°C

:

NiCr-Foil

Substrate

:

Al

AlN

Housing

:

Epoxy + heatsink aluminium

Connector Material

:

Cu, tinned, 4-pin

Max. torque backplate

:

1.0 Nm

Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK