X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
Date:	Sun, 23 Aug 2015 16:12:34 GMT
From:	falcon AT ivan DOT Harhan DOT ORG (Spacefalcon the Outlaw)
Message-Id:	<1508231612.AA21710@ivan.Harhan.ORG>
To:	geda-user AT delorie DOT com
Subject:	[geda-user] Microphone footprint woes
Reply-To:	geda-user AT delorie DOT com

Hello fellow free EDA users,

I need to put a microphone on my GSM development board, and I am
having an awfully hard time finding any guidance in part manufacturer
datasheets as to what the PCB land pattern should be.  Here is one
representative part for the kind of microphones I'm looking at:

http://www.digikey.com/product-detail/en/TOM-1242L-NF-R/668-1181-ND/1464920

But the manufacturer's datasheet (linked to from that Digi-Key page)
is utterly unhelpful when it comes to drawing a PCB footprint.  The
drawing depicts the overall circular shape of the part, but provides
no guidance whatsoever as to the shape, size and placement of the SMT
pads for the two terminals.

Digi-Key "helpfully" suggested this other part as an alternative, but
its datasheet drawing is no better:

http://www.digikey.com/product-detail/en/EM-4015-BC/433-1107-ND/3973695

Has anyone here ever used microphone parts of a similar kind?  Would
anyone happen to have a known-good PCB footprint?  Or would anyone
happen to have a recommendation for some other manufacturer's part
whose datasheet drawing includes the essential "recommended PCB layout"
part?

TIA,
SF

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