This part is a kind of semiconductor called WPM2341A.

Function of this product has MOSFET.

Manufacturers : WillSEMI

Image and pinout :

Some of the text within the PDF file :

WPM2341A WPM2341A P-Channel Enhancement Mode Mosfet Features zHigher Efficiency Extending Battery Life zMiniature SOT23-3 Surface Mount Package zSuper high density cell design for extremely low RDS (ON) Applications zDC/DC Converter zLoad Switch zBattery Powered System zLCD Display inverter zPower Management in Portable, Battery Powered Products ABSOLUTE MAXIMUM RATINGS TA = 25 °C, unless otherwise noted Parameter Steady Symbol 5 s Unit State Drain-Source Voltage Gate-Source Voltage Continuous Drain Current TA=25°C (TJ = 150 °C)a TA=80°C Pulsed Drain Current Continuous Source Current (Diode Conduction) a VDS VGS ID IDM IS -20 ±12 -4.3 -3.5 -3.2 -2.5 -20 -1.7 -1 V A Maximum Power Dissipation a TA=25°C TA=80°C Operating Junction and Storage Temperature Ra [ ... ]

WPM2341A PDF Datasheet Download