PWR221T-30-20R0F is a TO-220 style power resistor manufactured by Bourns using thick film on alumina ceramic technology, designed for current limiting, capacitor discharge, and current measurement circuits in power supplies for telecom and industrial applications. The resistor features a 20 O resistance value with ±1% tolerance, a power rating of 30 W at 25°C case temperature, and a maximum inductance of 0.1 µH, providing low-inductance performance suitable for high-frequency switching applications. It operates across a temperature range of -55°C to +150°C with a thermal resistance of 4.2°C/W, maximum operating voltage of 250 V, and dielectric strength of 2 kV AC. The device is AEC-Q200 compliant and RoHS compliant, making it ideal for automotive-grade applications including power supplies, motor drives, test and measurement equipment, and rectifier circuits.