This part is a kind of semiconductor called BF241.

Function of this product has NPN Transistor.

Manufacturers : Telefunken

Image and pinout :

Some of the text within the PDF file :

OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ OEM: Telefunken BF241 Datasheet http://www.semicon-data.com/ [ ... ]

BF241 PDF Datasheet Download