Product Overview
The Bourns PWR221T-50 Series is a high-power resistor designed with a TO-220 style housing and a ceramic backplane, offering low inductance and a high power rating. Manufactured using thick film on alumina ceramic technology, this series is ideal for current limiting, capacitor discharge, and current measurement circuits in power supplies for telecom and industrial applications. It is also suitable for motor drives and test and measurement equipment. The resistors are RoHS compliant.
Product Attributes
- Brand: Bourns
- Series: PWR221T-50 Series
- Housing Material: Epoxy
- Substrate Material: Alumina (AL203)
- Pin Material: Tinned Copper (Sn/Cu)
- Flammability: Conforms to UL-94V0
- Moisture Sensitivity Level: 1
- Origin: Costa Rica (Manufacturer's Trademark)
- Certifications: RoHS compliant*
- Packaging: 50 pcs./tube
Technical Specifications
| Parameter | Value(s) |
|---|---|
| Model Series | PWR221T-50 |
| Housing Type | TO-220 |
| Resistance Range | 0.02 to 130 K |
| Power Rating @ 25 C Case Temperature | 50 W(1) |
| Power Rating (Free Air @ 25C) | 2.25 W(1) |
| Tolerance | 1%(2), 5% |
| Hot TCR (0.100 R 130.0 K) | 100 PPM/C |
| Hot TCR (0.050 R 0.100 ) | 300 PPM/C |
| Hot TCR (0.020 R 0.050 ) | 600 PPM/C |
| Thermal Resistance (Rthj) | 2.5 C/W |
| Inductance | 0.1 H maximum |
| Operating Voltage | P*R with a maximum of 250 V |
| Dielectric Strength | 2 KV AC |
| Insulation Resistance | 10 G |
| Operating Temperature | -55 C to +150 C |
| Short Term Overload R | 0.25 % |
| Load Life (2000 hours) R | 1.0 % |
| Thermal Shock R | 0.5 % |
| Resistance to Soldering Heat R | 0.5 % |
| Vibration R | 0.25 % |
| Terminal Strength R | 0.2 % |
| Shock R | 0.5 % |
| Humidity (Steady State) R | 0.5 % |
| High Temperature Exposure R | 0.5 % |
| Product Dimensions (L x W x H) | 16.26 x 10.41 x 8.38 mm (0.640 x 0.410 x 0.330 inches) |
| Lead Diameter | 0.72 0.12 mm (0.029 0.005 inches) |
| How to Order Example (PWR221T-50-10R0F) | PWR=Power Resistor, 221=TO-220 Style, T=Through-hole, 50=50W, 10R0=10, F=1% Tolerance |
| Part Marking | 221 50 R500 1% YYWW COSTA RICA |
(1) Power rating when mounted on a heat sink. Free to air power dissipation is 2.25 W.(2) Available for most values. Check Popular Resistance Values table.
Note: Specifications are subject to change without notice. Users should verify actual device performance in their specific applications.
2411061756_BOURNS-PWR221T-50-56R0F_C3539001.pdf
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