[PCB_FORUM] Re: Thermal Pad vias-to-gnd plugged?

  • From: "Ritter, Alan" <Alan.Ritter@xxxxxxxxxx>
  • To: "icu-pcb-forum@xxxxxxxxxxxxx" <icu-pcb-forum@xxxxxxxxxxxxx>
  • Date: Wed, 25 Jan 2012 17:59:25 -0500

We had to do this with a USB hub chip from Cypress.  Their layout guidance 
included tenting the vias with soldermask to prevent wicking.  Take a look at 
the layout guidelines on page 23 of the CY7C65640A at:


Just one example...

Alan Ritter
Surgical Equipment Design & Development
Engineering Fellow

(636) 226-3364 (Office)
(636) 226-3552 (FAX)
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Bausch + Lomb
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From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Wednesday, January 25, 2012 4:50 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Thermal Pad vias-to-gnd plugged?

Hey guys,

When you have an IC with a thermal pad (e.g. A/D), the typical requirement is 
to put vias in the center pad that is connected to the gnd plane for heat 

Do you worry about the solder paste going down the vias, even with a 10 mil 
drill? My coworker is concerned that this will happen.

I haven't had this concern, have never "plugged" etc. the vias with no negative 


Gary MacIndoe
Senior PCB Design Engineer
EbD R&D Hardware
Surgical Solutions Group
5920 Longbow Drive
M/S A20
Boulder, CO 80301


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