This part is a kind of semiconductor called BTA12.

Function of this product has TRIAC.

Manufacturers : Rootech

Image and pinout :

Some of the text within the PDF file :

BTA12 MAIN FEATURES Symbol IT(RMS) VDRM/VRRM IG (Q1) Value 12 600 and 800 5 to 50 Unit A V mA DESCRIPTION Suitable for AC switching operations, can be used as an ON/OFF function in applications such as static relays, heating regulation, induction motor starting circuits... or for phase control in light dimmers, motor speed controllers,... The snubberless and logic level versions are specially recommended for use on inductive loads, thanks to their high commutation performances. By using an internal ceramic pad, the BTA series provides voltage insulated tab (rated at 2500V RMS) complying with UL standards. ABSOLUTE MAXIMUM RATINGS Symbol IT(RMS) Parameter Tc = 105°C F = 50 Hz F = 60 Hz tp = 10 ms F = 120 Hz tp = 20 µs Tj = 125°C Tj = 125°C Tj [ ... ]

BTA12 PDF Datasheet Download