This part is a kind of semiconductor called 55N10.

Function of this product has N-Channel MOSFET Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc N-Channel MOSFET Transistor isc Product Specification 55N10 DESCRIPTION ·Drain Current ID= 55A@ TC=25℃ ·Drain Source Voltage- : VDSS= 100V(Min) ·Fast Switching Speed APPLICATIONS ·General purpose power amplifier ABSOLUTE MAXIMUM RATINGS(TC=25℃) SYMBOL PARAMETER VALUE UNIT VDSS Drain-Source Voltage (VGS=0) VGS Gate-Source Voltage ID Drain Current-continuous@ TC=25℃ 100 ±30 55 V V A ID(puls) Pulse Drain Current 275 A Ptot Total Dissipation@TC=25℃ 250 W Tj Max. Operating Junction Temperature 150 ℃ Tstg Storage Temperature Range -55~150 ℃ ·THERMAL CHARACTERISTICS SYMBOL PARAMETER MAX UNIT Rth j-c Rth j-a Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient 0.5 ℃/W 62.5 ℃/W isc website：www.is [ ... ]

55N10 PDF Datasheet Download