The AO3401A is a MOSFET P Trench device manufactured by Youtai. It is rated to handle up to 30 volts of continuous voltage with a current of 4.1 amperes. It has a low gate threshold voltage of 1.3 volts and a low gate static drain-to-source leakage of 250 microamps. It offers superior RDS (ON) resistance of 65 milliohms at 4.2 amperes and a 10 volt gate-to-source cutoff voltage. It is packaged in a small SOT-23 outline with RoHS compliance, making it a great choice for many applications.