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January 2017

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Subject:	Re: Plugging Thermal Via Holes with Soldermask?
From:	John Parsons <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Mon, 30 Jan 2017 22:27:27 +0000
Content-Type:	text/plain
Parts/Attachments:	text/plain (1 lines)

Jack,



Solder mask plugged - not via fill and cap? That does seem like a lot for an additional solder mask step. I'd clarify with the vendor that they understand the requirement. Referencing IPC-4761 always takes out any speculation as to the requirement.



Regards,



John Parsons



-----Original Message-----

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack Olson

Sent: January-30-17 2:21 PM

To: [log in to unmask]

Subject: Re: [DC] Plugging Thermal Via Holes with Soldermask?



Just a follow-up to this discussion:



I just requested a quote comparison from a local board supplier.

We have three power devices, need an array of thermal vias in those three power pads.

ONLY the thermal vias need to be plugged (unique hole size).

So, about three square inches of board space needs to be plugged (hole size 10 mil, qty 168)



*The difference is bare board cost was $46 !!! or 33% !!!*



surprised,

Jack



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