This part is a kind of semiconductor called IRFD110PBF.
Function of this product has HEXFET Power MOSFET.
Manufacturers : International Rectifier
Image and pinout :

Some of the text within the PDF file :
PD- 95927 IRFD110PbF Lead-Free www.irf.com 1 10/27/04 IRFD110PbF 2 www.irf.com IRFD110PbF www.irf.com 3 IRFD110PbF 4 www.irf.com IRFD110PbF www.irf.com 5 IRFD110PbF 6 www.irf.com IRFD110PbF Peak Diode Recovery dv/dt Test Circuit + Circuit Layout Considerations • Low Stray Inductance • Ground Plane • Low Leakage Inductance Current Transformer + + - • dv/dt controlled by RG • ISD controlled by Duty Factor "D" • D.U.T. - Device Under Test + - * Reverse Polarity for P-Channel ** Use P-Channel Driver for P-Channel Measurements Driver Gate Drive P.W. Period D= P.W. Period VGS=10V D.U.T. ISD Waveform Reverse Recovery Current Body Diode Forward Current di/dt D.U.T. VDS Waveform Diode Recovery dv/dt VDD Re-Applied Voltage Inductor Curent Body Diode For [ ... ]
IRFD110PBF PDF Datasheet Download
