This part is a kind of semiconductor called 2N5681.

Function of this product has SILICON NPN TRANSISTORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

2N5681 2N5682 SILICON NPN TRANSISTORS s s SGS-THOMSON PREFERRED SALESTYPES NPN TRANSISTOR APPLICATIONS GENERAL PURPOSE SWITCHING s GENERAL PURPOSE AMPLIFIERS s DESCRIPTION The 2N5681, 2N5682 are high voltage silicon epitaxial planar NPN transistors in Jedec TO-39 metal case intended for use as drivers for high power transistors in general purpose, amplifier and switching applications. The complementary PNP types are the 2N5679 and 2N5680 respectively. TO-39 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAXIMUM RATINGS Symbol V CBO V CEO V EBO IC IB P tot P tot T stg Tj Parameter 2N5680 Collector-Base Voltage (I E = 0) Collector-Emitter Voltage (I B = 0) Emitter-Base Voltage (I C = 0) Collector Current Base Current Total Dissipation at T c ≤ 25 o C Total Dissipation at T amb ≤ 50 o C Storag [ ... ]

2N5681 PDF Datasheet Download