Ed,

In the past, it has been standard practice here to ask that of customers. We have recently (within the past twelve months) acquired the knowledge and capability to achieve fine pitch dam's between pads. Our best effort to date has produce uniform solder mask dams between pads down to 15 mil which were 2 mils themselves.

We are capable of maintaining dam's down to 4 mils on a consistent basis.

I am of the believe that this is where things are headed anyway.

Hope this helps.

Regards,

Franklin D Asbell



-----Original Message-----
From: Ed Cosper <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 13 October, 1999 7:10 AM
Subject: [TN] Fab: Mask dams between fine pitch smt pads


Hi all,

Just a quick industry capability questions. Are board manufactures still having trouble holding mask dams between fine pitch (19mil) SMT pads. As recent as a year or so ago I was under the impression that board shops would ask the remove these small dams when they got them on the Gerber data. Is this still common. I am interested in what most people think is feasible regarding mask dams that are 4 mils wide and smaller. All responses are appreciated.
 
Ed Cosper
ABC