The MSKSEMI BAS40-04 is a Schottky Barrier Diode (SBD) packaged in the SOT-23 form factor. It has a dual diode chip style and is rated to operate at 200mA with a breakdown voltage of 40V and 1V @ 40mA. The SBDs are RoHS compliant, meaning that they are free from dangerous metals or chemicals such as lead, cadmium, and mercury.