HSM4963 with null 6A 55mO@4.5V,6A 2W 2 P-Channel SOP-8 MOSFETs ROHS is a MOSFET manufactured by Huashuo, a Chinese semiconductor manufacturer. It is a SOP-8, RoHS compliant, 2 watt, 2 p-channel, 6A rated MOSFET with a 55mO maximum at 4.5V. The HSM4963 is used in a variety of applications including buck controllers, power management circuits, and low power switching applications.