BE Services, Inc., a subsidiary of Bourns, Inc., has purchased substantially all of Riedon's assets. See Press Release
Precision Shunt Resistor
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USR UNR 4-3425 4020 Precision Shunt Resistor |  |
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| Type | USR 4-3425 | USR 4-4020 | UNR 4-3425 | UNR 4-4020 |
|---|---|---|---|---|
| Resistance Range1 | 0.05 to 650 Ohms | 0.05 to 100 Ohms | ||
| Power Rating free air 70°C with heatsink |
3W 30W |
2.5W 30W |
3W 50W |
2.5W 50W |
| Thermal Resistance Rthj-c | 3.5 K/W | 3.6 K/W | 2.1 K/W | 2.2 K/W |
| Tolerances from 0.05 Ohms from 10.0 Ohms from 50.0 Ohms |
0.1% / 0.25% / 0.5% / 1% 0.05% / 0.1% / 0.25% / 1% 0.01% / 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 1% |
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| Stability | 0.01% | |||
| Shelf Life Stability | 25ppm / ΔR after 1 year 50ppm / ΔR after 3 year |
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| Temperature Coefficient | max. ±5ppm/K (-55 to 155°C) typ. ±3ppm/K (-55 to 155°C) upon request ±1ppm/K (25°C to 60°C) |
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| Voltage Proof | 750 VDC | |||
| Thermal EMF | < 1 µV/°K | |||
| Operating Temperature Range | -55°C to 155°C | |||
| Resistor Material | NiCr-Foil | |||
| Substrate | Al2O3 | AlN | ||
| Housing | Epoxy + Al-heatsink | |||
| Connector Material | Cu tinned | |||
| Max. Torque | 1.0 Nm | |||
1other resistance values upon request / power rating depending on resistance value
