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UStol.1
UStol.1
Visitor II
March 26, 2026
Solved

Moisture Sensitivity Level

  • March 26, 2026
  • 1 reply
  • 189 views

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?

Best answer by Peter BENSCH

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

1 reply

Peter BENSCH
Peter BENSCHAnswer
Technical Moderator
March 26, 2026

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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