This part is a kind of semiconductor called CA723C.

Function of this product has Voltage Regulators Adjustable from 2V to 37V at Output Currents Up to 150mA without External Pass Transistors.

Manufacturers : Intersil Corporation

Image and pinout :

Some of the text within the PDF file :

CA723, CA723C Data Sheet April 1999 File Number 788.4 Voltage Regulators Adjustable from 2V to 37V at Output Currents Up to 150mA without External Pass Transistors The CA723 and CA723C are silicon monolithic integrated circuits designed for service as voltage regulators at output voltages ranging from 2V to 37V at currents up to 150mA. Each type includes a temperature-compensated reference amplifier, an error amplifier, a power series pass transistor, and a current-limiting circuit. They also provide independently accessible inputs for adjustable current limiting and remote shutdown and, in addition, feature low standby current drain, low temperature drift, and high ripple rejection. The CA723 and CA723C may be used with positive and negative power supplies in a wide variety of series, [ ... ]

CA723C PDF Datasheet Download