This part is a kind of semiconductor called 9918H.

Function of this product has N-CHANNEL ENHANCEMENT-MODE POWER MOSFET.

Manufacturers : Silicon Standard

Image and pinout :

Some of the text within the PDF file :

SSM9918H,J N-CHANNEL ENHANCEMENT-MODE POWER MOSFET Low on-resistance Capable of 2.5V gate drive Low drive current Surface mount package D BV DSS R DS(ON) ID 20V 14mΩ 45A G S Description Power MOSFETs from Silicon Standard provide the designer with the best combination of fast switching, ruggedized device design, ultra low on-resistance and cost-effectiveness. G D S TO-252(H) G D S TO-251(J) Absolute Maximum Ratings Symbol VDS VGS ID@TC=25℃ ID@TC=125℃ IDM PD@TC=25℃ TSTG TJ Parameter Drain-Source Voltage Gate-Source Voltage Continuous Drain Current, VGS @ 4.5V Continuous Drain Current, VGS @ 4.5V Pulsed Drain Current 1 Rating 20 ± 12 45 20 140 48 0.38 -55 to 150 -55 to 150 Units V V A A A W W/ ℃ ℃ ℃ Total Power Dissipation Linear Derating Factor Storage Temperature [ ... ]

9918H PDF Datasheet Download