This part is a kind of semiconductor called ST26025A.

Function of this product has Silicon PNP Power Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Silicon PNP Darlington Power Transistor isc Product Specification ST26025A DESCRIPTION ·Collector-Emitter Breakdown Voltage- : V(BR)CEO= -100V(Min.) ·High DC Current Gain- : hFE= 750(Min.)@IC= -10A ·Low Collector Saturation Voltage- : VCE (sat)= -3.0V(Max.)@ IC= -20A APPLICATIONS ·Designed for use as output devices in complementary general purpose amplifier applications. ABSOLUTE MAXIMUM RATINGS (Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage -120 V VCEO Collector-Emitter Voltage -100 V VEBO Emitter-Base Voltage -5 V IC Collector Current-Continunous -20 A IB Base Current-Continunous PC Collector Power Dissipation @TC=25℃ Tj Junction Temperature -1 A 160 W 200 ℃ Tstg Storage Temperature Range -55~+200 ℃ THE [ ... ]

ST26025A PDF Datasheet Download