Thanks Denis - I've done a bit of research since yesterday, and it appears that heat will indeed be an issue since this particular PCB assembly will go through the lead-free process. I found that there is some R&D going on in the area of hi-temp OSP that will eventually solve the problem. And yes, I will ask the engineer for a data sheet that specifies exactly what he has in mind. Thanks to all who responded.


-----Original Message-----
From: Denis Lefebvre <[log in to unmask]>
Sent: Feb 17, 2010 5:06 PM
To: [log in to unmask]
Subject: Re: [DC] OSP - complete definition?

I'm no expert... but I do know that OSP is NOT heatproof, nor will you find any that is. It's one of the weaknesses of using OSP - you CANNOT bake the boards prior to assembly. It destroys the OSP. I only know this because one of or CM's pre-baked a lot of our OSP boards and they ended up in the scrap bin.
 
Denis Lefebvre, CID+
PCB Designer
Finisar Corporation
(408)542-3832
 

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, February 17, 2010 1:31 PM
To: [log in to unmask]
Subject: Re: [DC] OSP - complete definition?

Well, I was waiting to see if anyone would answer you,
(because we don't use OSP here), but I would bet its just
regular ol' OSP.
 
In a literal sense, there is no such thing as "heatproof".
You would have to quantify it to some acceptable limit
unless it is a mutually understood term (but I haven't
heard of it, so...)
 
Also, I would dare to speculate that he meant to say
"water soluble" instead of "water solubility".
 
If you suspect your engineer is trying to specify something
in particular, you shouldn't be afraid to ask him for a data
sheet or some industry recognized reference material.

good luck,
Jack
 
 
.
On Tue, Feb 16, 2010 at 4:00 PM, Alexis Meehan <[log in to unmask]> wrote:

One of our design engineers in our Japan office has designated a particular board finish as follows:

"heatproof water solubility organic solderability preservative"

I'm familiar with OSP, but the first 3 words have me wondering if this is regular OSP or some variation of that finish. Have you folks heard this particular description before? This is for an RF technology board.

Thanks for any info you can provide - Alexis Meehan, Opnext Inc.


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