This part is a kind of semiconductor called 2N3122.

Function of this product has Small Signal Transistors.

Manufacturers : Central

Image and pinout :

Some of the text within the PDF file :

Small Signal Transistors TO-39 Case (Continued) TYPE NO. DESCRIPTION VCBO (V) VCEO (V) *VCER VEBO (V) ICBO @ VCB (µA) (V) *ICEO **ICES ***ICEV ****ICER MIN 5.0 5.0 5.0 5.0 5.0 5.0 4.0 5.0 5.0 5.0 5.0 5.0 5.0 7.0 7.0 5.0 4.0 7.0 7.0 7.0 7.0 5.0 4.0 4.0 5.0 4.0 4.0 4.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0 6.0 6.0 6.0 7.0 7.0 0.10 0.10 0.50 0.50 0.10 0.10 -0.10 0.025 0.025 --0.20 0.10 0.10 0.25 0.01** 0.01** 0.01* 0.01* 0.01* 10 50 0.01* -0.50 0.50 0.50 0.50 0.50 0.50 0.50 0.01** 0.01** 0.10 -0.50*** 0.50*** 20 20 40 40 60 60 50 50 -50 50 50 --30 90 90 30 30 60 60 60 60 100 60 30 -30 30 20 30 30 40 60 50 50 50 -80 120 360 250 MIN 100 40 30 50 40 100 30 20 40 100 100 100 30 100 40 50 30 100 40 100 40 30 50 30 25 40 100 20 50 30 30 25 40 100 40 60 40 40 40 40 MAX 300 120 90 150 120 300 130 150 120 300 [ ... ]

2N3122 PDF Datasheet Download