This part is a kind of semiconductor called 2N4399.

Function of this product has PNP HIGH POWER SILICON TRANSISTOR.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA PNP HIGH POWER SILICON TRANSISTOR Qualified per MIL-PRF-19500/433 Devices 2N4399 2N5745 Qualified Level JANTX JANTXV MAXIMUM RATINGS Ratings Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Base Current Collector Current Total Power Dissipation Symbol VCEO VCBO VEBO IB IC PT TJ, Tstg Symbol RθJC RθJA 2N4399 60 60 5.0 7.5 30 2N5745 80 80 Unit Vdc Vdc Vdc Adc Adc W W 0 C Unit 0 @ TA =+ 250C (1) @ TC = +1000C (2) Operating & Storage Junction Temperature Range 20 5.0 115 -55 to +200 Max. 3 THERMAL CHARACTERISTICS Characteristics Thermal Resistance, Junction-to-Case Junction-to-Ambient 1) 0.875 35 TO-3* (TO-204AA) C/W 2) Derate linearly @ 28.57 mW/0C for TA > +250C Derate linearly @ 1.15 W/0C for TC > +1000C *See appendix A for package outline [ ... ]

2N4399 PDF Datasheet Download