X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=E7MKYokZZJdFYfIb3ff7v49GOF5aXxUnArTe5+QvD8E=;
        b=UyKMJiRUONqjw6o4YvfFJlD4lFBUmNbGdm1/m7QIl645x2zUgW2fzZSuZjBdfVxIIJ
         N9TG0qY1Cn2U9IgIjKN9K8gBPfEQS+CfH3C3dOvK4JD6xbKALAulT5FwItV2OO+h53hg
         bcQPAR8hIdVmN2ZeShiuZ3oZXMWxuM3i7eOsJBBJCHMURZO1IggQT4/l/6QsOF/349hh
         otbFLHiIYmmvZsYvwA2FyghmPMmh4QWcpuDmFyxHWgFv/btC2XjDYmwR+Vtz0DqGO/fw
         m1GG1Q0DZxYO8yUc6v85LqpgxrKrm+jjgaZb68SKOrWfr37rqD0aSld68Euiuf7S7Atq
         A0Cw==
MIME-Version: 1.0
X-Received: by 10.224.67.202 with SMTP id s10mr14426914qai.66.1374166272345;
 Thu, 18 Jul 2013 09:51:12 -0700 (PDT)
In-Reply-To: <CAN0Jx-8bMxPQu5AkX80U-3qB=U2HWg0-astWEuDj2cWS-k0ApA@mail.gmail.com>
References: <CALSZ9goF9oRVUfHM_UDyM60Kr=x4ONsXVtnVe4VJdm=F9YmDBg AT mail DOT gmail DOT com>
	<CAN0Jx-8bMxPQu5AkX80U-3qB=U2HWg0-astWEuDj2cWS-k0ApA AT mail DOT gmail DOT com>
Date: Thu, 18 Jul 2013 12:51:12 -0400
Message-ID: <CAOuGh89iVm_PsWQ1xJGVXGomdeZfUha7FQy_JdMFdDMh_C+HJQ@mail.gmail.com>
Subject: Re: [geda-user] PCB BGA (ball grid array) Package/Footprint
From: Bob Paddock <graceindustries AT gmail DOT com>
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset=ISO-8859-1
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

> The other is applying a thin layer of
> flux to the area of the BGA footprint.

Make sure there is a clear path for water flow (cleaning fluids) for
ingress and egress of the flux.

Makes a difference in reliability of high impedance circuits and ultra
low power circuits.

"Make it smaller" does not always go well with "make it manufacturable" when
 hard to clean parts (BGA/QFN/LCC/LGA) are surrounded by things like
bypass caps for example. :-(