This part is a kind of semiconductor called 2N2553.

Function of this product has PNP GERMANIUM ALLOY JUNCTION POWER TRANSISTORS.

Manufacturers : New Jersey Semi-Conductor

Image and pinout :

Some of the text within the PDF file :

20 STERN AVE. SPRINGFIELD, NEW JERSEY 07081 USA 2N1038, 2N1039*. ?N1040- 2N1041* 2N2552, 2N2553*, 2N2554, 2N2555* 2N2556,, 2N2557*, 2N2558, 2N2559* TELEPHONE: (973) 376-2922 (212)227-6005 FAX: (973) 376-8960 A B C PNP GERMANIUM ALLOY JUNCTION POWER These hermetically sealed and dynamically tested units are designedto switch reactive and resistive loads at maximum efficiency by using a unique internal heat-sink design. Each unit can dissipate up to .4 watt in free air at 25°C and up to 1 watt in forced air at 25°C and can also be pressed into suitable heat-sink wells to dissipate up to 8 watts at 71°C. Typical applications include relay drivers, pulse amplifiers, audio amplifiers and high current switching circuits. The collector lead is internally connected to the case. MAXIMUM DES [ ... ]

2N2553 PDF Datasheet Download