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May 2000

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Subject:
From:
Phil Crepeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 17 May 2000 13:28:07 -0700
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hi,

from my point of view, the mask between these pads is not necessary.  i find that the gap between the mounting pad and the window in the solder mask is a great trap for solder balls and other debris that isn't easy to remove.

phil

-----Original Message-----
From: Yvon Hache [mailto:[log in to unmask]]
Sent: Wednesday, May 17, 2000 12:44 PM
To: [log in to unmask]
Subject: [TN] Soldermask between pads


Hello everybody out there,

We have a board where the footprint for a Plastic Quad Flat Pack 160pins package has no soldermask between the pads.  The pads are 1,6mm x 0,33mm and the spacing center to center is 0,5mm.  This board does not have any traces running between these pads.  Can this cause any problem in the board manufacturing process and in the board assembly process?  If yes, what would be the recommendation?  How close can the soldermask be to the pads?

thanks,


Yvon Hache, P.Eng.
Tel: 506-863-2467
Email: [log in to unmask]

Concept + Inc.
Scientific Park, Suite 100
55 Crowley Farm Rd,
Moncton, NB
E1A 7R1

Tel: 506-858-4153
Fax: 506-858-4075
Web: www.concept-plus.com

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