This part is a kind of semiconductor called ST26025A.

Function of this product has PNP power Darlington transistor.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

ST26025A PNP power Darlington transistor Features ■ ■ High current monolithic Darlington configuration Integrated antiparallel collector-emitter diode TAB Applications ■ ■ 1 2 Automotive fan control Linear and switching industrial equipment TO-3 Description The ST26025A is an epitaxial-base PNP power transistor in monolithic Darlington configuration mounted in TO-3 metal case. It is intended for general purpose amplifier and low frequency switching applications. Figure 1. Internal schematic diagrams www.DataSheet.co.kr R1 typ. = 8 kΩ R2 typ. = 60 Ω Table 1. Device summary Marking 26025A Package TO-3 Packaging Tray Order code ST26025A October 2010 Doc ID 18031 Rev 1 1/7 www.st.com 7 Datasheet pdf - http://www.DataSheet4U.net/ Electrical ratings ST26025A 1 Elec [ ... ]

ST26025A PDF Datasheet Download