This part is a kind of semiconductor called C106D.

Function of this product has SCRs 4 AMPERES RMS 50 thru 600 VOLTS.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA MOTOROLA Order this document by C106/D Silicon Controlled Rectifier Reverse Blocking Triode Thyristors . . . Glassivated PNPN devices designed for high volume consumer applications such as temperature, light, and speed control; process and remote control, and warning systems where reliability of operation is important. • • • • Glassivated Surface for Reliability and Uniformity Power Rated at Economical Prices Practical Level Triggering and Holding Characteristics Flat, Rugged, Thermopad Construction for Low Thermal Resistance, High Heat Dissipation and Durability C106 Series * *Motorola preferred devices SCRs 4 AMPERES RMS 50 thru 600 VOLTS G A K A G A K CASE 77-08 (TO-225AA) STYLE 2 MAXIMUM RATINGS (TJ = 25°C unless oth [ ... ]

C106D PDF Datasheet Download