The BAT54S marking /KL4 is a dual common cathode Schottky diode in a SOT23 package, designed for general purpose rectification and switching applications. With a maximum forward voltage drop of 0.58V and a reverse voltage of 30V, this diode is suitable for use in low voltage, high frequency inverters, and precision rectifiers. The BAT54S is part of the Small Signal Schottky Diode Series and offers high switching speed and low capacitance, making it ideal for use in high-speed switching applications. This diode is RoHS compliant, ensuring it meets environmental and safety standards. Whether you are working on a hobby project or a professional electronic design, the BAT54S marking /KL4 is a reliable and versatile component to have in your toolkit.