This part is a kind of semiconductor called BD438.

Function of this product has Medium Power Linear and Switching Applications.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BD434/436/438 BD434/436/438 Medium Power Linear and Switching Applications • Complement to BD433, BD435 and BD437 respectively 1 TO-126 2.Collector 3.Base 1. Emitter PNP Epitaxial Silicon Transistor Absolute Maximum Ratings TC=25°C unless otherwise noted Symbol VCBO Parameter Collector-Base Voltage : BD434 : BD436 : BD438 VCES Collector-Emitter Voltage : BD434 : BD436 : BD438 Collector-Emitter Voltage : BD434 : BD436 : BD438 Emitter-Base Voltage Collector Current (DC) *Collector Current (Pulse) Base Current Collector Dissipation (TC=25°C) Junction Temperature Storage Temperature - 22 - 32 - 45 - 22 - 32 - 45 - 22 - 32 - 45 -5 -4 -7 -1 36 150 - 65 ~ 150 V V V V V V V V V V A A A W °C °C Value Units VCEO VEBO IC ICP IB PC TJ TSTG ©2001 Fairchild Semiconductor Corporation Rev. [ ... ]

BD438 PDF Datasheet Download