View bat54ws datasheet:

Preliminary Data Sheet PD-20633 12/01 BAT54WS SCHOTTKY DIODE 0.2 Amp 2 1 Major Ratings and Characteristics SOD323 Characteristics Value Units Description/ Features I F (DC) 0.2 A This Schottky barrier diode is designed for high speed switching application, voltage clamping and circuit protection. VRRM 30 V Miniature surface mount packages with reduced foot print are excellent for portable application where space is limited IFSM @ tp= 10 ms sine 1.0 A Small foot print, surface mountable VF @ 30mA DC, TJ = 25°C 0.5 V Very low forward voltage drop Extremely fast switching speed for high frequency operation Pd Power Dissipation 200 mW Guard ring for enhanced ruggedness and long term @ TA = 25°C reliability TJ range - 65 to 150 °C Case Styles Device Marking: IRWS K D