This part is a kind of semiconductor called BT137-600E.

Function of this product has Sensitive Gate Triacs.

Manufacturers : HAOPIN

Image and pinout :

Some of the text within the PDF file :

TM BT137-600E HPM Sensitive Gate Triacs HAOPIN MICROELECTRONICS CO.,LTD. Description Passivated, sensitive gate triacs in a plastic envelope, intended for use in general purpose bidirectional switching and phase control applications, where high sensitivity is required in all four quadrants. Symbol T2 T1 Simplified outline Pin 1 2 3 TAB G 1 2 3 TO-220 Description Main terminal 1 (T1) Main terminal 2 (T2) gate (G) Main terminal 2 (T2) SYMBOL VDRM IT RMS ITSM PARAMETER Repetitive peak off-state voltages RMS on-state current Non-repetitive peak on-state current Applications: Motor control Industrial and domestic lighting Heating Static switching Features Blocking voltage to 600 V On-state RMS current to 8 A Value 600 8 65 Unit V A A SYMBOL PARAMETER Rth j-mb Thermal resistance [ ... ]

BT137-600E PDF Datasheet Download