This part is a kind of semiconductor called BTA16-600B.

Function of this product has 16A TRIACS.

Manufacturers : TGS

Image and pinout :

Some of the text within the PDF file :

TIGER ELECTRONIC CO.,LTD Product specification 16A TRIACS GENERAL DESCRIPTION BTA/BTB16-600B Available either in through-hole or surface-mount packages, the BTA/BTB16 - 600B triac series is suitable for general purpose AC switching. They can be used as an ON/OFF function in applications such as static relays, heating regulation, induction motor starting circuits... or for phase control operation in light dimmers, motor speed controllers, ... The snubberless versions (BTA/BTB...W series) 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 ( Ta = 25 C) PARAMETER Repetitive peak off-state [ ... ]

BTA16-600B PDF Datasheet Download