This part is a kind of semiconductor called T1M5F.

Function of this product has Sensitive Gate Triacs.

Manufacturers : BRIGHT HORIZON TECHNOLOGY

Image and pinout :

Some of the text within the PDF file :

VAST BRIGHT HORIZON TECHNOLOGY CORP SEMICONDUCTOR TECHNICAL DATA Sensitive Gate Triacs T1M5F Series 1、Description Designed for use in solid state relays, MPU interface, TTL logic and any other light industrial or consumer application. Supplied in an inexpensive TO-92 package which is readily adaptable for use in automatic insertion equipment. Sensitive Gate Triggering In Four Trigger Modes for all possible Combinations of Trigger Sources, and Especially for Circuits that Source Gate Drives 2、Features „ Blocking voltage to 600V „ On-state RMS current to 1 A „ Sensitive Gate Triggering in Four Trigger Modes (Quadrants) for all possible Combinations of Trigger Sources, and especially for Circuits that Source Gate Drives „ All Diffused and Glassivated Junctions for Maximum Uniform [ ... ]

T1M5F PDF Datasheet Download