High speed switching, Recovery diode, what is a Schottky rectifier, RF Diodes

 ZHCS1000 Series 1000 mA 40 V 100 uA High Current Schottky Barrier Diode - SOT-23

https://www.futureelectronics.com/p/semiconductors--discretes--diodes--schottky-diodes/zhcs1000ta-diodes-incorporated-8003485