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 of 50W. Manufactured using thick film on alumina ceramic technology, this resistor is ideal for current limiting, capacitor discharge, and current measurement circuits. Its robust construction and RoHS compliance make it suitable for demanding applications in power supplies, motor drives, test and measurement equipment, and rectifiers within telecom and industrial sectors.
Product Attributes
- Brand: Bourns
- Series: PWR221T-50
- Housing: TO-220 style
- Technology: Thick film on alumina ceramic
- Substrate Material: Alumina (AL203)
- Pin Material: Tinned Copper (Sn/Cu)
- Flammability: Conforms to UL-94V0
- Moisture Sensitivity Level: 1
- Packaging: 50 pcs./tube
- Certifications: RoHS compliant*
Technical Specifications
| Parameter | Value(s) |
|---|---|
| Resistance | 0.02 to 130 K (See Popular Resistance Values table) |
| Power Rating @ 25 C Case Temperature | 50 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 at rated power) 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 % |
| Power rating free to air (no heat sink) | 2.25 W(1) |
| Power dissipation on FR4 board @ 25 C | 2.8 W |
| Model Breakdown: PWR221T-50-10R0F | PWR = Power Resistor, 221 = TO-220 Style, T = Through-hole, 50 = 50 W, 10R0 = 10 , F = 1% Tolerance |
| Part Marking: | 221 50 R500 1% YYWW COSTA RICA (Example for R500, 1% tolerance) |
(1) Power rating of 2.25 W when mounted free to air (no heat sink).
(2) Available for most values. Check Popular Resistance Values table.
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
2410311217_BOURNS-PWR221T-50-R220F_C3370484.pdf
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