The document introduces the features and characteristics of Vishay Sfernice 50W power resistor, including 50W power, thick film technology, TO-220 package, leaded and surface mount versions, high power to size ratio, non inductive element, RoHS directive 2002/95/EC compatibility, etc.
The RTO 50 is a 50 W thick‑film power resistor offered by Vishay Sfernice in a TO‑220 package. It features sand‑trimmed resistance values, non‑inductive construction, and is RoHS‑compliant. The device can be supplied in leaded (radial) or surface‑mount versions.
Technical data include a resistance range from 0.010 Ω to 550 kΩ, tolerances from ±1 % to ±10 %, and a temperature coefficient of ±150 ppm/°C. The resistor is rated for operation from –55 °C to +155 °C, with a thermal resistance (junction‑to‑case) of 2.6 °C/W and a maximum voltage rating of 300 V (UL).
| Power rating | 50 W at +25 °C (heatsink mounted) |
|---|---|
| Thermal resistance (junction‑to‑case) | 2.6 °C/W |
| Resistance range | 0.010 Ω to 550 kΩ |
| Tolerance | ±1 % to ±10 % |
| Temperature coefficient | ±150 ppm/°C |
| Maximum voltage | 300 V (UL) |
| Insulation resistance | ≥ 10⁶ MΩ |
| Operating temperature range | -55 °C to +155 °C |
| Weight | 2.2 g max |
The RTO 50 can dissipate 50 W when mounted on a heatsink at +25 °C.
The junction‑to‑case thermal resistance is 2.6 °C/W.
It is offered in leaded (radial leads) and surface‑mount versions.
Yes, the resistor complies with the RoHS directive 2002/95/EC.