This part is a kind of semiconductor called T1M5F400A.

Function of this product has Sensitive Gate Triacs.

Manufacturers : Lite-On

Image and pinout :

Some of the text within the PDF file :

LITE-ON SEMICONDUCTOR T1M5F-A SERIES TRIACs 1.0 AMPERES RMS 400 thru 600 VOLTS TO-92 (TO-226AA) Sensitive Gate Triacs Sillicon Bidirectional Thyristors FEATURES One-Piece, Injection-Molded Package Blocking Voltage to 600 Volts 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 Uniformity of Parameters and Reliability Improved Noise Immunity (dv/dt Minimum of 20 V/msec at 110¢J ) Commutating di/dt of 1.6 Amps/msec at 110¢J High Surge Current of 12 Amps Pb-Free Package TO-92 (TO-226AA) TO-92 DIM. A MIN. 4.45 4.32 3.18 1.15 2.42 12.7 2.04 2.93 3.43 MAX. 4.70 5.33 4.19 1.39 2.66 -2.66 - SEATING PLANE B C D E F G H [ ... ]

T1M5F400A PDF Datasheet Download