This part is a kind of semiconductor called 2N3866.

Function of this product has Silicon planar epitaxial overlay transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET 2N3866; 2N4427 Silicon planar epitaxial overlay transistors Product specification Supersedes data of August 1986 File under Discrete Semiconductors, SC08a 1995 Oct 27 Philips Semiconductors Product specification Silicon planar epitaxial overlay transistors DESCRIPTION NPN overlay transistors in TO-39 metal packages with the collector connected to the case. The devices are primarily intended for class-A, B or C amplifiers, frequency multiplier and oscillator circuits. PINNING - TO-39/1 PIN 1 2 3 emitter base collector handbook, halfpage 2N3866; 2N4427 APPLICATIONS • The transistors are intended for use in output, driver or pre-driver stages in VHF and UHF equipment. DESCRIPTION 1 2 MBB199 3 Fig.1 Simplified outline. QUICK REFERENCE DATA SYMB [ ... ]

2N3866 PDF Datasheet Download