This part is a kind of semiconductor called 2N3019.

Function of this product has LOW POWER NPN SILICON TRANSISTOR.

Manufacturers : Microsemi

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA LOW POWER NPN SILICON TRANSISTOR Qualified per MIL-PRF-19500/391 Devices 2N3019 2N3019S 2N3057A 2N3700 2N3700S Qualified Level JAN JANTX JANTXV JANS MAXIMUM RATINGS Ratings Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current Total Power Dissipation @ TA = +250C(1) 2N3019; 2N3019S 2N3057A 2N3700 2N3700UB @ TC = +250C(2) 2N3019; 2N3019S 2N3057A 2N3700 2N3700UB Operating & Storage Jct Temp Range Symbol VCEO VCBO VEBO IC PT TJ, Tstg Value 80 140 7.0 1.0 0.8 0.4 0.5 0.4 5.0 1.8 1.8 1.16 -55 to +175 Units Vdc Vdc Vdc Adc W W 0C TO-39* (TO-205AD) 2N3019, 2N3019S TO- 18* (TO-206AA) 2N3700 TO-46* (TO-206AB) 2N3057A 1) Derate linearly 4.6 mW/0C for type 2N3019 and 2N3019S; 2.3 mW/0C for type 2N3057A; 2.85 mW/0C for type 2N3700; 6.6 mW/0C [ ... ]

2N3019 PDF Datasheet Download