B340A-13-F

The B340A-13-F from Diodes Incorporated is a 3A, 40V Schottky barrier rectifier in an SMA (DO-214AC) surface-mount package. The low 0.5V typical forward voltage at 3A significantly reduces conduction losses compared to silicon PN diodes, making it ideal for high-efficiency DC-DC converter freewheeling and output rectification. The 40V reverse voltage rating suits 5V and 12V power rails. A guard ring structure provides ruggedness against voltage transients. The SMA package provides reliable solder joints with minimal board space.

The B340A-13-F is a metal-semiconductor (Schottky) junction diode. Unlike a PN junction diode, a Schottky diode uses a metal contact on an N-type semiconductor, forming a barrier that conducts with lower forward voltage (0.5V vs 0.7V for silicon). The majority-carrier conduction mechanism eliminates stored charge, enabling fast switching with essentially zero reverse recovery time. This is critical for DC-DC converter freewheeling applications where the diode must transition from conducting to blocking very rapidly. The guard ring around the active area provides a PN junction that protects the Schottky contact from voltage transients and excessive reverse leakage.

• Buck converter freewheeling (catch) diode
• Reverse battery polarity protection for 5V/12V rails
• Power supply output Schottky rectification
• Battery charging steering diode
• Redundant power supply OR-ing diode