The BAS21 with Switching Diode SOT-23-3 RoHS is a three terminal switching diode manufactured by Youtai. It is primarily used as an ESD protection diode, power switching diode, signal and switching diode, steering diode, current regulator and trigger diode. This device is in a RoHS compliant SOT-23-3 package with an integrated output protection diode. It is also capable of handling high surge current and is well suited for a wide range of application conditions. The BAS21 is designed for both low noise and high performance operation. The device is rated for up to 350mA of current and has a maximum reverse voltage rating of 4V.