This part is a kind of semiconductor called 2N3054A.

Function of this product has NPN POWER TRANSISTOR IN A HERMETIC PACKAGE.

Manufacturers : Seme LAB

Image and pinout :

Some of the text within the PDF file :

2N3054A MECHANICAL DATA Dimensions in mm NPN POWER TRANSISTOR IN A HERMETIC PACKAGE 6.35 (0.250) 8.64 (0.340) 3.68 (0.145) rad. max. 3.61 (0.142) 3.86 (0.145) rad. 24.33 (0.958) 24.43 (0.962) 0.71 (0.028) 0.86 (0.034) FEATURES 11.94 (0.470) 12.70 (0.500) 14.48 (0.570) 14.99 (0.590) • GENERAL PURPOSE SWITCHING AND AMPLIFIER APPLICATIONS. • MAINTENANCE STATUS DO NOT USE ON NEW DESIGNS 4.83 (0.190) 5.33 (0.210) 9.14 (0.360) min. 1.27 (0.050) 1.91 (0.750) TO66 Pin 1 – Base Pin 2 – Emitter Case - Collector ABSOLUTE MAXIMUM RATINGS (Tcase = 25°C unless otherwise stated) VCBO VCEO VCER VEB IC IC(PK) IB PD TJ,Tstg Collector – Base Voltage Collector – Emitter Voltage Collector – Emitter Voltage (RBE = 100W) Emitter – Base Voltage Continuous Collector Current Peak Colle [ ... ]

2N3054A PDF Datasheet Download