This part is a kind of semiconductor called KIA7912PI.

Function of this product has 1A THREE TERMINAL NEGATIVE VOLTAGE REGULATORS.

Manufacturers : KEC

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA KIA7912PI BIPOLAR LINEAR INTEGRATED CIRCUIT 1A THREE TERMINAL NEGATIVE VOLTAGE REGULATORS -12V. FEATURES Suitable for C-MOS, TTL, and the other digital IC power supply. Internal thermal overload protecting. Internal short circuit current limiting. Output current in excess of 1.0A. LINE-UP ITEM OUTPUT VOLTAGE (Typ.) UNIT KIA7912F/PI -12 O Q A U E K LL M DD NN T T 123 G B J F P C DIM MILLIMETERS A 10.30 MAX B 15.30 MAX C 2.70Ź0.30 S D 0.85 MAX E Φ3.20Ź0.20 F 3.00Ź0.30 G 12.30 MAX T RH 0.75 MAX J 13.60Ź0.50 K 3.90 MAX L 1.20 VM N 1.30 2.54 O 4.50Ź0.20 P 6.80 Q 2.60Ź0.20 HR S 10Ɓ 25Ş T 5Ş U 0.5 V 2.60Ź0.15 1. GND 2. INPUT 3. OUTPUT TO-220IS MAXIMUM RATINGS (Ta=25 ) CHARACTERISTIC SYMBOL Input Voltage VIN Pow [ ... ]

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