This part is a kind of semiconductor called UTC78D05.

Function of this product has 3 Terminal 0.5A Positive Voltage Regulator.

Manufacturers : Unisonic

Image and pinout :

Some of the text within the PDF file :

UTC 78DXX LINEAR INTEGRATED CIRCUIT 3-TERMINAL 0.5A POSITIVE VOLTAGE REGULATOR DESCRIPTION The UTC 78DXX family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 0.5 A. 1 TO-252 FEATURE *Output current up to 0.5 A *Fixed output voltage of 3.3V,4.7V,5V, 6V, 8V, 9V, 12V, 15V ,18V and 24V available *Thermal overload shutdown protection *Short circuit current limiting *Output transistor SOA protection 1 TO-251 1: Input 2: GND 3: Output EQUIVALENT CIRCUIT INPUT 1 R13 T10 R17 T8 R9 T9 Z2 T12 T14 R19 R18 R11 R14 T11 T13 T5 T6 R12 R10 OUTPUT 3 R8 R15 T4 Z1 T15 R5 R4 R6 T7 R16 R1 R2 C1 T3 R7 T1 T2 R3 GND 2 UTC UNISONIC TECHNOLOGIES CO. LTD 1 QW-R101-005,C UTC 78DXX PARAMETER LINEAR INTEG [ ... ]

UTC78D05 PDF Datasheet Download