This part is a kind of semiconductor called BTA41600B.

Function of this product has 40A standard TRIACs.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

BTA40, BTA41, BTB41 40 A standard TRIACs Features ■ High current TRIAC ■ Low thermal resistance with clip bonding ■ High commutation capability ■ BTA series UL1557 certified (File ref: 81734) ■ Packages are RoHS (2002/95/EC) compliant Applications ■ On/off function in static relays, heating regulation, induction motor starting circuits ■ Phase control operations in light dimmers, motor speed controllers, and similar Description Available in high power packages, the BTA/BTB40-41 series is suitable for general purpose AC switching. The BTA series provides an insulated tab (rated at 2500 V rms). A2 G A1 A1 G A2 RD91 insulated (BTA40) A2 A1 A2 G TOP3 insulated (BTA41) A1 A2 G TOP3 (BTB41) Table 1. Device summary Symbol Parameter IT(RMS) On-state rms current VDRM/VRRM [ ... ]

BTA41600B PDF Datasheet Download