This part is a kind of semiconductor called 2N4239.

Function of this product has (2N4237 - 2N4239) NPN MEDIUM POWER SILICON TRANSISTOR.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA NPN MEDIUM POWER SILICON TRANSISTOR Qualified per MIL-PRF-19500/581 Devices 2N4237 2N4238 2N4239 Qualified Level JANTX JANTXV MAXIMUM RATINGS (TA = 250C Unless Otherwise noted) Ratings Symbol 2N4237 2N4238 2N4239 Units Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current Base Current Total Power Dissipation @ TA = +250C(1) @ TC = +250C(2) Operating & Storage Temperature Range VCEO VCBO VEBO IC IB PT Top, Tstg Symbol RθJC 40 50 60 80 6.0 1.0 0.5 1.0 6.0 -65 to +200 Max. 29 80 100 Vdc Vdc Vdc Adc Adc W W °C Unit C/W TO-39* THERMAL CHARACTERISTICS Characteristics Thermal Resistance, Junction-to-Case 1) Derate linearly 5.7 mW/0C for TA > +250C 2) Derate linearly 34 mW/0C for TC > +250C 0 *See appendix A for package ou [ ... ]

2N4239 PDF Datasheet Download