The BSD3A031LV45 is an electronic part manufactured by Bourne. It is an ESD SOD-323 surface mount diode with an RoHS-compliant lead-free package. It is designed to provide variable protection against electrostatic discharge, such as from cords, cables, and other electronic surfaces. It has a reverse block voltage of -31 to -45 volts, with up to 12 nanoamperes maximum current. It also has a fast switching speed, a temperature range of -65 to +150?C, and a maximum thermal resistance of 1?/W.