This part is a kind of semiconductor called BAW56S.
Function of this product has High-speed double diode array.
Manufacturers : Philipss
Image and pinout :

Some of the text within the PDF file :
DISCRETE SEMICONDUCTORS DATA SHEET MBD128 BAW56S High-speed double diode array Product specification Supersedes data of 1997 Aug 27 File under Discrete Semiconductors, SC01 1997 Oct 21 Philips Semiconductors Product specification High-speed double diode array FEATURES • Small plastic SMD package • High switching speed: max. 4 ns • Continuous reverse voltage: max. 75 V • Repetitive peak reverse voltage: max. 85 V • Repetitive peak forward current: max. 450 mA. APPLICATIONS • General purpose switching in e.g. surface mounted circuits. DESCRIPTION The BAW56S consists of two dual high-speed switching diodes with common anodes, fabricated in planar technology, and encapsulated in the small SMD SOT363 plastic package. 1 Top view Marking code: A1t. 2 3 MSA370 BAW56S PINNING [ ... ]
BAW56S PDF Datasheet Download
