This part is a kind of semiconductor called 2N6237.

Function of this product has SIlicon Controlled Rectifiers.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Silicon Controlled Rectifiers Reverse Blocking Triode Thyristors . . . 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. • Passivated 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 • Recommended Electrical Replacement for C106 G AK Order this document by 2N6237/D 2N6237 thru 2N6241 SCRs 4 AMPERES RMS 50 thru 600 VOLTS A G AK CASE 77-08 (TO-225AA) STYLE 2 MAXIMUM RATINGS (TJ = 25°C unless otherwise noted.) [ ... ]

2N6237 PDF Datasheet Download