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| Date: | Fri, 17 Jun 2011 13:11:54 -0400 |
| Content-Type: | text/plain |
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Can you put down a double dot of SMT adhesive? I have had to do this in the past when MELF pads were not right. With the right size and spaced dots the MELF is cradled and does not move.
Jerry Dengler
Production Manager
Pergamon Corporation
380 Crooked Lane, Unit# 3
King of Prussia, PA 19406-2567
U.S.A.
(610) 239-0721 Phone
(610) 239-0720 Fax
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard D. Krug
Sent: Friday, June 17, 2011 1:00 PM
To: [log in to unmask]
Subject: [TN] Plugged & Tented Vias Under MELF's
We've got a customer's PWB that has vias with the barrel either coated with solder mask or epoxy filled, then covered with solder mask. The plugging tends to leave a small protrusion above the copper surface. Some of these locations happen to be centered at MELF locations. During reflow, MELF's shift off the high point.
Prevention / mitigation ideas anyone?
Dick Krug, SSBB, CSMTPE
SMT Process Engineer
Sparton Corporation
30167 Power Line Road
Brooksville, FL 34602-8299
p (352) 540-4012 (Internal Ext. 2012)
[log in to unmask]
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