Product Overview
The Bourns PWR221T-30 Series is a TO-220 style power resistor manufactured using thick film on alumina ceramic technology. Designed for current limiting, capacitor discharge, and current measurement circuits, this resistor is ideal for power supplies in telecom and industrial applications, as well as motor drives, test and measurement equipment, and rectifiers. Key features include a low inductance, ceramic backplane, high power rating, and compliance with AEC-Q200 and RoHS standards. Its robust construction and reliable performance make it suitable for demanding applications.
Product Attributes
- Brand: Bourns
- Series: PWR221T-30
- Housing: TO-220 style
- Substrate Material: Alumina (AL203)
- Resistor Material: Thick film
- Pin Material: Tinned Copper (Sn/Cu)
- Flammability: Conforms to UL-94V0
- Moisture Sensitivity Level: 1
- ESD Classification (HBM): 3B
- Packaging: 50 pcs./tube
- Certifications: AEC-Q200 compliant, RoHS compliant*
- Origin: COSTA RICA
Technical Specifications
| Parameter | Value(s) |
|---|---|
| Resistance | 0.02 to 130 K (See Popular Resistance Values table) |
| Power Rating @ 25 C Case Temperature | 30 W** |
| Tolerance | 1 %***, 5 % |
| TCR (0.100 <R<130.0K ) | 100 PPM/C |
| TCR (0.050 <R<0.100 ) | 300 PPM/C |
| TCR (0.020 <R<0.050 ) | 600 PPM/C |
| Thermal Resistance - Rthj | 4.2 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 R (2000 hours at rated power) | 1.0 % |
| Thermal Shock R (-55 C to 155 C, 5 cycles) | 0.5 % |
| Resistance to Soldering Heat R (10 seconds at 270 C) | 0.5 % |
| Vibration R (20 G 10-2000 Hz .06 D.A.) | 0.25 % |
| Terminal Strength R (MIL-STD-202, Method 211 Test A1) | 0.2 % |
| Shock R (Saw Tooth: 100 g/6 ms) | 0.5 % |
| Humidity R (Steady State) 1000 hrs. 85 C/85 % RH | 0.5 % |
| High Temperature Exposure R (100 hrs - 40 % Pr @ +125 C) | 0.5 % |
| Free Air Power Rating @ 25 C | 2.25 W (when mounted free to air, no heat sink) |
| Model Numbering Scheme | PWR221T-30-ResistanceValue-Tolerance |
| Example Part Marking | 221 30 R500 1% YYWW COSTA RICA |
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
**Power rating of 2.25 W when mounted free to air (no heat sink).
*** Available for most values. Check Popular Resistance Values table.
2410301800_BOURNS-PWR221T-50-20R0F_C7328774.pdf
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