Product Overview
The Bourns PWR221T-50 Series is a high-power resistor designed with a TO-220 style housing and a ceramic backplane, featuring low inductance. Manufactured using thick film on alumina ceramic technology, this resistor is ideal for current limiting, capacitor discharge, and current measurement circuits within power supplies for telecom and industrial applications. Its robust construction and high power rating make it suitable for demanding applications such as power supplies, motor drives, test and measurement equipment, and rectifiers. The series is RoHS compliant.
Product Attributes
- Brand: Bourns
- Series: PWR221T-50
- Housing Material: Epoxy
- 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
- Origin: Costa Rica (Manufacturer's Trademark)
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) |
| Power Rating (Free Air @ 25 C) | 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 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 % |
| Product Dimensions (L x W x H) | 16.26 x 9.14 x 8.38 mm (0.640 x 0.360 x 0.330 inches) |
| Model Number Structure | PWR221T-50-ResistanceCode-ToleranceCode |
| Tolerance Code F | 1 % |
| Tolerance Code J | 5 % |
| Typical Part Marking | 221 50 ResistanceCode ToleranceCode YYWW COUNTRY OF ORIGIN |
(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.
Note: Specifications are subject to change without notice. Users should verify actual device performance in their specific applications.
2411061755_BOURNS-PWR221T-50-1R00F_C3533983.pdf
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