Product Overview
The Bourns PWR221T-50 Series is a high-power TO-220 style resistor designed for demanding applications. Utilizing thick film on an alumina ceramic substrate, this resistor offers excellent performance in current limiting, capacitor discharge, and current measurement circuits. It is ideal for power supplies in telecom and industrial sectors, as well as motor drives and test and measurement equipment. Key features include a low inductance, ceramic backplane for enhanced thermal management, and RoHS compliance.
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
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 @ 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) 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 (1000 hrs. 85 C/85 % RH) R | 0.5 % |
| High Temperature Exposure (100 hrs - 40 % Pr @ +125 C) R | 0.5 % |
| Dimensions (L x W x H) | 16.26 0.25 mm (.640 .010 in) x 10.41 0.25 mm (.410 .010 in) x 8.38 0.25 mm (.330 .010 in) |
| Part Marking | 221 50 RXXX 1% YYWW |
| How to Order Example: PWR221T-50-10R0F | PWR = Power Resistor, 221 = TO-220 Style, T = Through-hole, 50 = 50 W, 10R0 = 10 , F = 1 % Tolerance |
| How to Order Example: PWR221T-50-2000J | PWR = Power Resistor, 221 = TO-220 Style, T = Through-hole, 50 = 50 W, 2000 = 200 , J = 5 % Tolerance |
Applications
- Power supplies
- Motor drives
- Test and measurement
- Rectifiers
- Current limiting circuits
- Capacitor discharge circuits
- Current measurement circuits
- Telecom applications
- Industrial applications
Product Dimensions
Refer to the technical drawing for detailed dimensions.
Power Derating Curve
The power rating is dependent on the case temperature. See graph for details.
Pulse Power Rating
Energy absorbed by the resistor in Joules can be calculated by multiplying peak power (watts) by pulse length (seconds). Energy should not exceed graph limits. Overload voltage should not exceed 1.5 times the maximum operating voltage.
Additional Information
*RoHS Directive 2015/863, Mar 31, 2015 and Annex. Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
2411070908_BOURNS-PWR221T-50-1001J_C3573130.pdf
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