This part is a kind of semiconductor called BT169D.

Function of this product has Thyristors.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Thyristors isc Product Specification BT169D FEATURES ·With TO-92 package ·Sensitive gate trigger current ·Low reverse and forward blocking current ·Low holding current ·For general purpose switching and phase control applications. ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VDRM VRRM IT(AV) IT(RMS) PGM PG(AV) ITSM Tj Tstg Repetitive peak off-state voltage Repetitive peak off-state voltage Average on-state current RMS on-state current Peak gate power Average gate power Non-repetitive peak on-state current Operating junction temperature Storage temperature MIN 400 400 0.5 0.8 2 0.1 8 125 -40~+ 150 UNIT V V A A W W A ℃ ℃ ELECTRICAL CHARACTERISTICS (TC=25℃ unless otherwise specified) SYMBOL PARAMETER CONDITIONS VDRM VRRM IRRM IDRM IGT [ ... ]

BT169D PDF Datasheet Download