This part is a kind of semiconductor called FR3707Z.

Function of this product has IRFR3707Z.

Manufacturers : International Rectifier

Image and pinout :

Some of the text within the PDF file :

PD - 94648 Applications l High Frequency Synchronous Buck Converters for Computer Processor Power l High Frequency Isolated DC-DC Converters with Synchronous Rectification for Telecom and Industrial Use Benefits l Very Low RDS(on) at 4.5V VGS l Ultra-Low Gate Impedance l Fully Characterized Avalanche Voltage and Current HEXFET® Power MOSFET IRFR3707Z IRFU3707Z Qg 9.6nC 9.5m: VDSS RDS(on) max 30V D-Pak IRFR3707Z I-Pak IRFU3707Z Absolute Maximum Ratings Parameter VDS VGS ID @ TC = 25°C ID @ TC = 100°C IDM PD @TC = 25°C PD @TC = 100°C TJ TSTG Drain-to-Source Voltage Gate-to-Source Voltage Continuous Drain Current, VGS @ 10V Continuous Drain Current, VGS @ 10V Pulsed Drain Current Max. 30 ± 20 56 39 Units V A ™ f f 220 50 25 0.33 -55 to + 175 300 (1.6mm [ ... ]

FR3707Z PDF Datasheet Download