X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Original-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20161025;
	h=mime-version:in-reply-to:references:from:date:message-id:subject:to;
	bh=UvCC+uY2D/BULvGPr3Bl2tVQ1DIevjxuryItsQG0jAo=;
	b=UsOBZhpd0Bo1KkyLZgboUcvMLSfZp5SytMQie+jAWLOu4F3eIgHri9gRh/C18ITOb0
	Ud3a/DUHxi2kh+HbedNfcH/v1AUNJ7rt0c2dhp8uHWdm7yQH+SLQ7i55WmKhEAPT0H30
	jXb01lICPgCGWSsw2C0GnifsTxfH977Xpv7G1aKQmgslSjqJJKmT8WBYb4t0UEolAD4G
	1nwnoI8gAtqWVIZHyXY31lOA0Yo7Plsdsz+Hb99d6r3TknocgLYoqJB8pExhkv/UNcvQ
	DdW/JV8hajBSL6hX/cbPm6+Htm53CXTgKQAanOz4LJUbfBh1W/pR//WQBkGsV/6MoTsf
	OCVg==
X-Google-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=1e100.net; s=20161025;
	h=x-gm-message-state:mime-version:in-reply-to:references:from:date
	:message-id:subject:to;
	bh=UvCC+uY2D/BULvGPr3Bl2tVQ1DIevjxuryItsQG0jAo=;
	b=TzTGmkR47HdtbNXV4pGgOrMPlcP0Zy8OiHPDcoPahjJg6Q1jHrNvoT2uMcTc3IPps4
	gfTenyd2QqisXth34088DtLKIuqpZnecDa7QFSNOWrb0Deeaz8DVUjwNOUfFpOW+SjyT
	wy9ka03+vYszyLEv3O81xKFbtKqiBDR89sMdbe2t3b9DSVnpPcVkCUh7ATOtBv/GYmN+
	8nBeIavTvUYkLjITkvwa04cK3vKRtn3hUAwdQEtgbtrELnC71tkHSGoACKtWo5SNtJC+
	GbSaPWOYMLw1r2oFA3yGGmVtcdpNthZ5Lcq7hchdt2zcVXPxELYVSRhOp3Bq2Rlz1dpg
	AYYw==
X-Gm-Message-State:	AFeK/H3HMqPxvhIZYGAYiC3dKEeASvC1W1KVOazF8911xUyikd70vX8NyUSahec+tRqlXpq2/HXlv1xJL+t2eg==
X-Received:	by 10.25.168.15 with SMTP id r15mr11169986lfe.70.1490208010732;
	Wed, 22 Mar 2017 11:40:10 -0700 (PDT)
MIME-Version:	1.0
In-Reply-To:	<xna88d6ube.fsf@envy.delorie.com>
References:	<20170322172551 DOT DF40C8106DD0 AT turkos DOT aspodata DOT se> <xna88d6ube DOT fsf AT envy DOT delorie DOT com>
From:	"Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Wed, 22 Mar 2017 14:40:10 -0400
Message-ID:	<CAM2RGhStxuc8ZN42N-FeEiZMi0pncWR-UVQcijZL8SNWpuonZA@mail.gmail.com>
Subject:	Re: [geda-user] handsolder QFN packages
To:	gEDA users mailing list <geda-user AT delorie DOT com>
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

On Wed, Mar 22, 2017 at 2:27 PM, DJ Delorie <dj AT delorie DOT com> wrote:
>
> I've done bottom-only QFNs with a hotplate and by hand; the trick is to
> design the footprint so that the pads extend out past the edge of the
> part far enough to get your soldering iron in there.  Use extra solder
> (or put paste on the pcb and reflow with your iron) and use the extended
> pads to drag the excess solder away from the part.
>
> I think the best approach with an iron is to put paste down, then the
> part, hold it in place with some sort of "third hand" (tape or a
> weight), and use the iron to reflow the paste.
>
> And I can't find a photo online of what I'm talking about, so:
> http://www.delorie.com/pcb/soldering-tricks/

Have you done any with exposed center pad?

-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v2
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=Ta4p
-----END PGP PUBLIC KEY BLOCK-----

- Raw text -