BE Services, Inc., a subsidiary of Bourns, Inc., has purchased substantially all of Riedon's assets. See Press Release
Precision Foil Resistors
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USR UNR 2-T220 / T220B / T221 Precision Foil Resistors |  |
|---|---|
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| Type | USR / USS | UNR / UNS |
|---|---|---|
| Resistance Range | 0.5 Ohms to 150K Ohms | 0.5 Ohms to 5K Ohms |
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Power Rating |
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| Thermal Resistance Rthj-c R<50R0 R>50R0 |
10.8 K/W 18.8 K/W |
6.8 K/W 10.8 K/W |
| Tolerances from 0.5 Ohms from 10.0 Ohms from 25.0 Ohms from 50.0 Ohms |
0.1% / 0.25% / 0.5% / 1% 0.05% / 0.1% / 0.25% / 0.5% / 1% 0.02% / 0.05% / 0.1% / 0.25% / 0.5% / 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 125°C) |
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| Voltage Proof | 1 kVDC | |
| Thermal EMF | < 0.1µV/K | |
| Operating Temperature Range | -55 to 155°C | |
| Resistor Material | NiCr-Foil | |
| Substrate | AI2O3 | AIN |
| Housing | Epoxy + Cu heatsink nickel plated | |
| Connector Material | Cu tinned | |
| Terminals | 2 | |
| Max. torque | 1.0 Nm | |
| Notes | Specially designed for applications with fast changing electrical load |
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