ImSn thickness

Subscribe to Thread

Hi, questions about PCB ImSn finishing : a) how much i... - Feb 16, 2007 by

Good afternoon, Typical plating thickness for immersion t... - Feb 16, 2007 by Hypnotia

IPC-4554 Specification for Immersion Tin Plating for Printed... - Feb 16, 2007 by davef

Thank You Pavel and Dave, Unfortunately I do not have IPC... - Feb 19, 2007 by

#47709

ImSn thickness | 16 February, 2007

Hi,

questions about PCB ImSn finishing :

a) how much is the standard thickness (most common)?

b) how much is the maximum thickness obtainable by this finishing process?

Thank you

Regards....GS

This message was posted via the Electronics Forum @

reply »

Hypnotia

#47711

ImSn thickness | 16 February, 2007

Good afternoon,

Typical plating thickness for immersion tin is 0.6-1.0um. I do not know what the maximal thickness is. But plating is self-limiting process and I believe maximal thickness should be about 2-3um.

BR, Pavel

reply »

davef

#47744

ImSn thickness | 16 February, 2007

IPC-4554 Specification for Immersion Tin Plating for Printed Circuit Boards

reply »

#47826

ImSn thickness | 19 February, 2007

Thank You Pavel and Dave,

Unfortunately I do not have IPC-4554.

Anyway I 0.6-1.0umm is what I remember, and confirmed by reading also through leterature available on google.

I was just going to understand if it possible to obtain more thickness even if it seams the process is complex.

It was a discussion among friends, where they say that in order to avoid tin oxidations (due to IMC moving on surface, etc ) after first SMT or Second SMT pass before THT wave, to increase Tin thickness could help to avoid unwetting problems and improvo vertical fill :)

But I think ( not alone)that ImSn is not a good finisch in case of L-F soldering more then one SMT side/pass and THT.

Tnks

Best Regards...GS

This message was posted via the Electronics Forum @

reply »