Download the HMM5121B datasheet PDF.
This datasheet also covers the HMM5121B_Hi variant, as both devices belong to the same zener diodes family and are provided as variant models within a single manufacturer datasheet.
Note: The manufacturer provides a single datasheet file (HMM5121B_Hi-SincerityMocroelectronics.pdf) that lists specifications for multiple related part numbers.
HMM5121B Datasheet
