This part is a kind of semiconductor called HT7133-1.

Function of this product has 30mA Voltage Regulator.

Manufacturers : Holtek Semiconductor Inc

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Some of the text within the PDF file :

HT71XX-1 30mA Voltage Regulator Features · Low power consumption · Low voltage drop · Low temperature coefficient · High input voltage (up to 24V) · Output voltage accuracy: tolerance ±3% · TO-92, SOT-89 and SOT-25 package Applications · Battery-powered equipment · Communication equipment · Audio/Video equipment General Description The HT71XX-1 series is a set of three-terminal low power high voltage regulators implemented in CMOS technology. They allow input voltages as high as 24V. They are available with several fixed output voltages ranging from 3.0V to 5.0V. CMOS technology ensures low voltage drop and low quiescent current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain variable voltages and currents. [ ... ]

HT7133-1 PDF Datasheet Download