Semiconductor.The Alpha & Omega Semiconductor (AOS) AO4403 is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) designed for unipolar, or low-side, applications. It has a -30V drain-to-source voltage (VDS), which is effectively the transistors breakdown voltage. Drain current (ID), or amount of current sourced from the drain, is rated up to -5A. It is capable of continuous power dissipation of up to 2 watts, making it acceptable for a variety of applications including low-side switching, level shifting, and general load driver applications. It is packaged in the industry standard SO8 surface mount package, making it suitable for use in modern circuit designs that utilize SMT technologies.