50R-JMDSS-G-1-TF(S) from JST. What does the S suffix mean?

Interconnect Rectangular Connectors
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50R-JMDSS-G-1-TF(S)

JST has a part number convention that has a lot of universal codes. Below is a link to a page that will help you better understand. them.

JST Suffixes LF SN AU S N M prefixes G W C Q D - Interconnect - Electronic Component and Engineering Solution Forum - TechForum │ DigiKey

This S suffix however can mean different things to different series or even different part numbers. We have communicated with JST and have found that for JMD series receptacles it means the following.

The (S) indicates a modification made to the guide ribs of the receptacle to help prevent breakage during accidental, slantwise mating cycles instead of the proper straight mating method. For more information please contact us here for a handling manual of the series.

JST JMD receptacles can found on DigiKey here:
Arrays, Edge Type, Mezzanine (Board to Board) | Rectangular Connectors | Electronic Components Distributor DigiKey