This part is a kind of semiconductor called AP1703.

Function of this product has 3-Pin Microprocessor Reset Circuits.

Manufacturers : Anachip

Image and pinout :

Some of the text within the PDF file :

3-Pin Microprocessor Reset Circuits AP1701/2/3/4 „ Features - Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages - Fully Specified Over Temperature - Available in Three Output Configurations - Push-Pull RESET Low Output (AP1701/3) - Push-Pull RESET High Output (AP1702/4) - 140ms min Power-On Reset Pulse Width - 12µA Supply Current - Guaranteed Reset Valid to VCC = +1V - Power Supply Transient Immunity - No External Components - 3-pin SOT23 package „ Applications - Computers - Controllers - Intelligent Instruments - Critical µP and µC Power Monitoring - Portable/Battery Powered Equipment - Automotive „ General Description The AP1701/2/3/4 are used for microprocessor (µP) supervisory circuits to monitor the power supplies in µP and digital systems. They provide exce [ ... ]

AP1703 PDF Datasheet Download