The Microchip APT100F50J Discrete Semiconductor Module FG FREDFET, 500V, SOT-227 is a semiconductor device used to control the flow of electricity within a circuit. It has an operating voltage of 500V, and features a N-Channel PowerTrench MOSFET in an ultra-small SOT-227 package with fast switching speed, low on-resistance and low gate charge. This device is used in a variety of DC applications such as power switching, motor control, soft start, variable frequency drives, phase control, and transient voltage protection. It is rated for output currents of up to 25A at 25°C and has a maximum power dissipation of 20W.