This part is a kind of semiconductor called 2N4000.

Function of this product has Bipolar NPN Device in a Hermetically sealed TO39 Metal Package.

Manufacturers : Seme LAB

Image and pinout :

Some of the text within the PDF file :

2N4000 Dimensions in mm (inches). 8.51 (0.34) 9.40 (0.37) 7.75 (0.305) 8.51 (0.335) Bipolar NPN Device in a Hermetically sealed TO39 Metal Package. Bipolar NPN Device. 6.10 (0.240) 6.60 (0.260) 12.70 (0.500) min. 0.89 max. (0.035) 0.41 (0.016) 0.53 (0.021) dia. VCEO = 80V 5.08 (0.200) typ. IC = 1A 2.54 (0.100) 2 1 0.74 (0.029) 1.14 (0.045) 0.71 (0.028) 0.86 (0.034) 3 All Semelab hermetically sealed products can be processed in accordance with the requirements of BS, CECC and JAN, JANTX, JANTXV and JANS specifications 45° TO39 (TO205AD) PINOUTS 1 – Emitter 2 – Base 3 – Collector Parameter VCEO* IC(CONT) hFE ft PD Test Conditions Min. Typ. Max. 80 1 Units V A Hz @ 2/1 (VCE / IC) 30 40M 120 1 W * Maximum Working Voltage This is a shortform datasheet. For a full [ ... ]

2N4000 PDF Datasheet Download