This part is a kind of semiconductor called 7812H.

Function of this product has OM7812H.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

OM7800IH Series ISOLATED HERMETIC TO-257AA FIXED VOLTAGE REGULATORS Three Terminal, Fixed Voltage, 1.5 Amp Precision Positive Regulators In Hermetic JEDEC TO-257AA Package FEATURES • • • • • • Isolated Hermetic Package, JEDEC TO-257AA Outline Output Voltages: 5V, 12V, 15V (Other Voltages Available) Output Voltages Set Internally To ±1% or ±2% Built-In Thermal Overload Protection Short Ciruit Current Limiting Product Is Available Screened To OM803 DESCRIPTION These three terminal positive regulators are supplied in a hermetically sealed metal package whose outline is similar to the industry standard TO-220 plastic package. All protective features are designed into the circuit including thermal shutdown, current limiting and safe-area control. With heat [ ... ]

7812H PDF Datasheet Download