The SI4401BDY(UMW) is a N-channel low voltage power MOSFET manufactured by Youtai. It is housed in an 8-pin SOP-8 package and is RoHS compliant. The device features high ON resistance and is designed for low-power, low-voltage applications such as large DC/DC converters, DC-DC converters, high-efficiency step-down regulators, and in-rush current limiters. The MOSFETs are suitable for a wide range of industrial applications, medical equipment and consumer electronics such as telecom systems, power supplies, motor drives and automotive systems. It has an on-resistance of 4.4mO at 4.5V gate-drive voltage, a breakdown voltage of 200V, and a maximum rated drain current of 8A. The device also offers good thermal dissipation and fast switching speed.