X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
Subject: Re: [geda-user] QFN packages solder mask
To: geda-user AT delorie DOT com
References: <2df480cc-5ef2-9ac6-b7ad-d17788a6b8b9 AT ecosensory DOT com>
From: "Dan McMahill (dan AT mcmahill DOT net) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID: <aec326a8-34dd-b47e-837a-b249748918b0@mcmahill.net>
Date: Tue, 17 Jan 2017 23:00:39 -0500
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101
 Thunderbird/45.6.0
MIME-Version: 1.0
In-Reply-To: <2df480cc-5ef2-9ac6-b7ad-d17788a6b8b9@ecosensory.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-CMAE-Envelope: MS4wfDMUl4oAPuHymOhuQesXTX/ucgGQn8JmEs4iMj2OnClsVm63a3ybdewGqlJhgfVHCDsTn//AV+5aEQtGyfLpQwK4psTrGXKxaYesQDoxmw7YcT962Dgp
 Ju8o7zxcQTS0qGOketRrNu7ym/TA6+lWRJPH7RkulhcoEjP/DFTwamQD
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

On 1/17/2017 4:47 PM, John Griessen (john AT ecosensory DOT com) [via 
geda-user AT delorie DOT com] wrote:
> I've been making footprints for QFN packages and came across guidelines
> by the chip makers that say
> it is beneficial to have some solder mask under the edge of the QFN
> package, but not if it gets too thin
> anywhere, as it can come off and cause trouble if it is.

I don't have great suggestions about the soldermask bit.  Did you look 
at the QFN footprints in the ~geda library?  I thought we had a decent 
coverage of packages but it has been a while since I looked.