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