The Hottech BAT54S SOT-23-3 RoHS device is a Schottky Barrier Diode (SBD) package of three diodes in a SOT-23 configuration. It is designed to act as switch components to guard against large voltages and current spikes, which can damage other electronic components. They have a particularly low forward voltage drop, making them energy efficient. The BAT54S is available in different tolerance levels, depending on the necessary circuit protection and is RoHS compliant. It has high operation frequency and temperature rating, and can handle up to 200mA of current. The package itself is a SOT-23-3 which has an extremely small footprint on the board, making it a great choice for designs with space at a premium.