The BAT54 is surface mount fast switching planar schottky barrier diode in SOT-23 package. These diode is single configured featured with PN junction guard ring for transient and ESD protection. Automotive grade AEC-Q101 qualified. Peak repetitive reverse voltage of 30V.
The BAT85 series from NXP are axial leaded Schottky barrier diodes. These diodes feature a hermatically sealed leaded glass package and are suitable for mounting on a 5.08mm pitch. They are commonly used for ultra high-speed switching, voltage clamping, blocking and protection circuits.
BAT54 Schottky barrier diode
Planar Schottky barrier diode with an integrated guard ring for stress protection, encapsulated in a small SOT23 (TO-236AB) Surface-Mounted Device (SMD) plastic package.
diodes.com bat54 datasheet here .