This part is a kind of semiconductor called KIA378R12PI.

Function of this product has BIPOLAR LINEAR INTEGRATED CIRCUIT (4 TERMINAL 3A OUTPUT LOW DROP VOLTAGE REGULATOR).

Packge : TO-220IS-4

Manufacturers : KEC(Korea Electronics)

Image and pinout :

Some of the text within the PDF file :

The KIA378Rᴧᴧ Series are Low Drop Voltage Regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220 4 terminal lead full molded PKG. The Regulator has multi function such as over current protection, overheat protection and ON/OFF control.

FEATURES

 

1. 3.0A Output Low Drop Voltage Regulator.

 

2. Built in ON/OFF Control Terminal.

3. Built in Over Current Protection, Over Heat Protection Function

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KIA378R12PI PDF Datasheet Download