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Date: | Fri, 04 Oct 96 06:55:52 PST |
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Clear Soldermask or Unpigmented Soldermask will hold a very tight
tolerances. It is typical to see 2 mil registration with this type of
soldermask. Most manufactures of LPI soldermask offer Clear version.
It has also been approved by IPC on IPC-SM-840C.
______________________________ Forward Header __________________________________
Subject: Soldermask-misregistration
Author: [log in to unmask] at corp
Date: 9/5/96 11:48 AM
Does anyone know if there is a particular soldermask that will keep
tighter registration. For instance, is a liquid soldermask able to
keep a tighter registration than a dry film? Currently, we allow for
a 4mil misregistration in our soldermask opening. We would like to
bring that number down to 2 or 1mil on a very tight board we have
(that has cooper covering the ground pads-causing the ground pads to
have a larger shape) without having the manufacturer scrap alot of
boards. Our plating is immersion nickel/gold.
Thank-you
Charlene Dwyer
[log in to unmask]
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