Onsemi Zener diode - difference between SZMMSZ and MMSZ series


Can any one please explains the di difference between family series SZMMSZ and MMSZ. The are exactly the same, so why different part numbers?


I have read in the data sheet an explanation of the SZ prefix

  • SZ Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements

I think this resolve the inquiry.


1 Like

Hello @ammar.al-latifi

You are correct this is for the Automotive rating. Here is a snip from the datasheet as a reference for additional users who read this post.


Thank you Robert for your reply and addition of the data sheet.

BR / Ammar

by the way, for the marking of SZMMSZ5261BT1G, there are different marking when we buy from two different sources. See the photo attached, anyone can help verify or confirm?

Add images

N1 is the proper marking for this part looking at page 3 of the datasheet. The differences in markings could be different manufacturing locations. Could be a difference in time between datecodes that have affected markings. Using the marking information on page 3 of the datasheet is the best way to verify.