The CDBUR54 is a Schottky barrier diode from Comchip Technology, rated for 30V reverse voltage and 200mA forward current. It features low forward voltage and fast reverse recovery time of 5 ns.
The CDSUR4148-HF is a surface mount switching diode from Comchip Technology. It features a 75V repetitive peak reverse voltage, 150mA forward current, and 4ns reverse recovery time.