This part is a kind of semiconductor called 2N6027.

Function of this product has Programmable Unijunction Transistor.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

2N6027, 2N6028 Preferred Device Programmable Unijunction Transistor Programmable Unijunction Transistor Triggers Designed to enable the engineer to “program’’ unijunction characteristics such as RBB, h, IV, and IP by merely selecting two resistor values. Application includes thyristor−trigger, oscillator, pulse and timing circuits. These devices may also be used in special thyristor applications due to the availability of an anode gate. Supplied in an inexpensive TO−92 plastic package for high−volume requirements, this package is readily adaptable for use in automatic insertion equipment. Features • Programmable − RBB, h, IV and IP • Low On−State Voltage − 1.5 V Maximum @ IF = 50 mA • Low Gate to Anode Leakage Current − 10 nA Maximum • High Peak Output Voltage [ ... ]

2N6027 PDF Datasheet Download