This part is a kind of semiconductor called AM2301.

Function of this product has -20V P-CHANNEL ENHANCEMENT MODE MOSFET.

Manufacturers : AiT Semiconductor

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Some of the text within the PDF file :

AiT Semiconductor Inc. www.ait-ic.com AM2301 MOSFET -20V P-CHANNEL ENHANCEMENT MODE DESCRIPTION The AM2301 is the P-Channel logic enhancement mode power field effect transistor is produced using high cell density. Advanced trench technology to provide excellent RDS(ON). This high density process is especially tailored to minimize on-state resistance. These devices are particularly suited for low voltage application, and low in-line power loss are needed in a very small outline surface mount package. FEATURES  -20V/-3.2A, RDS(ON)=90mΩ(typ.)@VGS =-4.5V  -20V/-2.0A, RDS(ON)=130mΩ(typ.)@VGS =-2.5V  Super high density cell design for extremely low RDS(ON)  Exceptional on-resistance and Maximum DC current capability  This is a Green compliance  Available in a SOT-23 pac [ ... ]

AM2301 PDF Datasheet Download