RB Series Schottky Barrier Diodes ROHM Semiconductor RB Series Schottky Barrier Diodes (SBDs) are surface-mount diodes designed for general rectification. These Schottky barrier diodes feature high reliability, low reverse current (IR), and silicon epitaxial planar structure. The RB Schottky barrier diodes come in a TO-252 (DPAK) package. These Shottky diodes are suitable for switching power supplies.