This part is a kind of semiconductor called TYN412.

Function of this product has HIGH SURGE CAPABILITY HIGH ON-STATE CURRENT HIGH STABILITY AND RELIABILITY.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

TXN/TYN 0512 ---> TXN/TYN 1012 SCR . . . . FEATURES HIGH SURGE CAPABILITY HIGH ON-STATE CURRENT HIGH STABILITY AND RELIABILITY TXN Serie : INSULATED VOLTAGE = 2500V(RMS) (UL RECOGNIZED : E81734) DESCRIPTION The TYN/TXN 0512 ---> TYN/TXN 1012 Family of Silicon Controlled Rectifiers uses a high performance glass passivated technology. This general purpose Family of Silicon Controlled Rectifiers is designed for power supplies up to 400Hz on resistive or inductive load. ABSOLUTE RATINGS (limiting values) Symbol IT(RMS) IT(AV) ITSM RMS on-state current (180° conduction angle) Average on-state current (180° conduction angle,single phase circuit) Non repetitive surge peak on-state current ( Tj initial = 25°C ) I2 t value Critical rate of rise of on-state current Gate supply : IG = 100 mA di [ ... ]

TYN412 PDF Datasheet Download