This part is a kind of semiconductor called BAW56S.

Function of this product has Silicon Switching Diode.

Manufacturers : Infineon Technologies AG

Image and pinout :

Some of the text within the PDF file :

BAW56... Silicon Switching Diode • For high-speed switching applications • Common anode configuration BAW56 BAW56T BAW56W ! BAW56S BAW56U $ # , " " , ! ,  , ,  ,   ! Type BAW56 BAW56S BAW56T BAW56U BAW56W Package SOT23 SOT363 SC75 SC74 SOT323 Configuration common anode double common anode common anode double common anode common anode Marking A1s A1s A1s A1s A1s 1 Jun-03-2003 BAW56... Maximum Ratings at TA = 25°C, unless otherwise specified Parameter Diode reverse voltage Peak reverse voltage Forward current Surge forward current, t = 1 µs Total power dissipation BAW56, TS ≤ 31°C BAW56S, TS ≤ 85°C BAW56T, TS ≤ 104°C BAW56U, TS ≤ 90°C BAW56W, TS ≤ 103°C Junction temperature Storage temperature Thermal Resistance Parameter Junction - soldering point1) BA [ ... ]

BAW56S PDF Datasheet Download