This might sound a bit weak, but probably yes.
As we allow those alloys to be used and have many suppliers of lead free HASL pcbs it is probable. We have been doing so since at least 1 year prior to RoHS day.
However it would take a lot of work to categorically confirm that combination has been used.

There might be a metallurgist on the forum who can pass an opinion.
I raised the permit to allow all these finishes under the banner of Lead free HASL on our drawings after a meeting at NPL where a discussion took place about the differences in SN100C/SACX/SAC/SnCu finishes. A metallurgist and joint expert made a comment along the lines that it would be difficult to determine any difference in behaviour or reliability in joints made on the different HASL finishes.
The finish creates a solderable surface, the alloy on the pcb represents a small proportion of the metal used in the joint so there should be no discernable difference.

If you had a solderability issue in your initial work I would suspect something other than the alloy combination.

Sorry I cannot be definitive about the use of the combination.

Regards
Rex
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cedric ORAIN
Sent: 14 September 2011 11:04
To: [log in to unmask]
Subject: Re: [TN] Sn100C

Hello REX,

Thanks for sharing. Do you confirm you have SMD process with SAC alloy using Sn100C fichich ?

Regards,

Cedric 

-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Rex Waygood Envoyé : mercredi 14 septembre 2011 10:21 À : [log in to unmask] Objet : Re: [TN] Sn100C

I am quite surprised that you had a problem with HAL/HASL SN100C.
We allow HASL of SN100C/SACX/SAC and the various combinations of SnCu that are on offer and I don't recall a solderability issue since RoHS day (-1 year!). We process lots and lots of boards with these finishes.
I wish ENIG were as trouble free.
We solder with SN100C in our solder bath and it has been a fairly painless transition from a SAC alloy that we originally used. 

Regards
Rex

Rex Waygood
Technical Manager
 
Hansatech EMS provides value manufacturing through engineering and quality
 
Hansatech EMS Limited
Benson Road
Nuffield Industrial Estate
Poole
Dorset
BH17 0RY
 
+44 (0)1202 338200


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Cedric ORAIN
Sent: 14 September 2011 08:20
To: [log in to unmask]
Subject: [TN] Sn100C

Good morning again !

 

This is the second subject for which I need your help today. During previous work -when I qualified lead free assembly years ago- several PCB finitions was compared. Among the finitions we tested, HAL Sn100C was rejected because of reflow issues using SAC305 solder paste. 

 

Problems were lack of solderability. I assumed that the reason was because of the difference between liquidus of Sn100c in comparaison with SAC305. We didn't make a lot of work to solve that as we head quickly to ENIG and I finally rejected Sn100C. until this week when a customer request Sn100C for cost reason.

 

So I would appreciate testimony of technetters that use successfully Sn100C as PCB finition with SMD process as well as troubleshooting feedback regarding this process.

 

Regards,

 

Cedric

 <http://www.inovelec-group.com> www.inovelec-group.com

 

 



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