This part is a kind of semiconductor called BC257.

Function of this product has PNP SILICON PLANAR EPITAXIAL TRANSISTOR.

Manufacturers : New Jersey Semi-Conductor

Image and pinout :

Some of the text within the PDF file :

, One. 20 STERN AVE. SPRINGFIELD, NEW JERSEY 07081 U.S.A. BC177,8,9 BC257,8,9 .BC307,8,9 TELEPHONE: (973) 376-2922 (212) 227-6005 FAX: (973) 376-8960 BC320,1,2 THE ABOVE TYPES ARE PNP SILICON PLANAR EPITAXIAL TRANSISTORS FOR USE IN AF SMALL SIGNAL AMPLIFIER STAGES AND DIRECT COUPLED CIRCUITS, BC177, 8, 9 are complementary to BC107, 8, 9. BC257, 8, 9 are complementary to BC167, 8, 9. BC307, 8, 9 are complementary to BC237, 8, 9. BC320, 1, 2 are complementary to BC317, 8, 9. CASE TO-18 TO-92B TO-92F TO-92A CBS BC177,8,9 ECB BC257,8,9 CEB BC307,8,9 SSC BC320fl,2 ABSOLUTE MAXIMUM RATINGS TYPE -VCBO -VCES (v) (v) BC177 BC178 BC179 50 50 30 30 25 25 BC257 BC258 BC259 50 50 30 30 25 25 3C307 BCJ08 3C309 50 50 30 30 25 25 -VCEO (v) 45 25 20 45 25 20 45 25 20 -VEBO (v) 5 5 [ ... ]

BC257 PDF Datasheet Download