This part is a kind of semiconductor called 7430.

Function of this product has Negative Voltage Regulator.

Manufacturers : Holtek Semiconductor Inc

Image and pinout :

Some of the text within the PDF file :

HT74XX Negative Voltage Regulator Features · · · Low power consumption Low voltage drop Low temperature coefficient · · · High input voltage (up to -24V) High output current : 100mA (Pd £ 250mW) TO-92 and SOT-89 package Applications · · Battery-powered equipment Communication equipment · Audio/Video equipment General Description The HT74XX series is a set of three-terminal high current high voltage regulator implemented in CMOS technology. They can deliver 100mA output current and allow an input voltage as high as -24V. They are available with several fixed output voltages ranging from -2.4V to -15V. CMOS technology ensures low voltage drop and low quiescent current. Although designed primarily as fixed voltage regulators, these devices can be used with external component [ ... ]

7430 PDF Datasheet Download