This part is a kind of semiconductor called BAS4.

Function of this product has CASE 318-08/ STYLE 8 SOT-23 TO-236AB.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BAS40LT1/D Schottky Barrier Diodes These Schottky barrier diodes are designed for high speed switching applications, circuit protection, and voltage clamping. Extremely low forward voltage reduces conduction loss. Miniature surface mount package is excellent for hand held and portable applications where space is limited. BAS40LT1 Motorola Preferred Device 3 CATHODE 1 ANODE 40 VOLTS SCHOTTKY BARRIER DIODES 3 1 2 MAXIMUM RATINGS (TJ = 150°C unless otherwise noted) Rating Reverse Voltage Forward Power Dissipation @ TA = 25°C Derate above 25°C Operating Junction and Storage Temperature Range Symbol VR PF 225 1.8 TJ, Tstg – 55 to +150 mW mW/°C °C Value 40 Unit Volts CASE 318 – 08, STYLE 8 SOT– 23 (TO – 236AB) D [ ... ]

BAS4 PDF Datasheet Download