Moisture Sensitivity Level

UStol.1 · ‎2026-03-26

I’m a bit confused by the conflicting information regarding the STM part VN21-E.

There is no MSL specified on the STM label – which makes sense given that it is a Pentwatt package (through-hole mounting = wave soldering = no real risk of MSL damage).

However, STMs official partner DigiKey (and others) specify an MSL 3.

That can’t actually be right, can it?

Peter BENSCH · ‎2026-03-26

The VN21 was a High Side Smart Power SSR, which has already been discontinued, so no information is available from ST anymore. I can only assume that Digikey entered some MSL value, as this was indeed not usual for this package variant.

Hope that answers your question?

Regards
/Peter

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Peter BENSCH · ‎2026-03-26

The VN21 was a High Side Smart Power SSR, which has already been discontinued, so no information is available from ST anymore. I can only assume that Digikey entered some MSL value, as this was indeed not usual for this package variant.

Hope that answers your question?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.