X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-ASG-Debug-ID: 1490205652-097fa263f643ba7e0001-9re8WH X-Barracuda-Envelope-From: gheskett AT shentel DOT net X-Barracuda-RBL-Trusted-Forwarder: 204.111.2.17 From: "Gene Heskett (gheskett AT shentel DOT net) [via geda-user AT delorie DOT com]" X-Barracuda-Effective-Source-IP: n64s149.fttx.shentel.net[204.111.64.149] X-Barracuda-Apparent-Source-IP: 204.111.64.149 X-Barracuda-RBL-IP: 204.111.64.149 To: geda-user AT delorie DOT com Subject: Re: [geda-user] handsolder QFN packages Date: Wed, 22 Mar 2017 14:00:51 -0400 X-ASG-Orig-Subj: Re: [geda-user] handsolder QFN packages User-Agent: KMail/1.9.10 (enterprise35 0.20100827.1168748) References: <20170322172551 DOT DF40C8106DD0 AT turkos DOT aspodata DOT se> In-Reply-To: <20170322172551.DF40C8106DD0@turkos.aspodata.se> X-KMail-QuotePrefix: > MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Disposition: inline Message-Id: <201703221400.51991.gheskett@shentel.net> X-Barracuda-Connect: smtp1.edbg.cloud.shentel.net[204.111.2.17] X-Barracuda-Start-Time: 1490205652 X-Barracuda-URL: https://204.111.1.147:443/cgi-mod/mark.cgi X-Barracuda-Scan-Msg-Size: 1421 X-Virus-Scanned: by bsmtpd at cloud.shentel.net X-Barracuda-BRTS-Status: 1 X-Barracuda-Spam-Score: 0.50 X-Barracuda-Spam-Status: No, SCORE=0.50 using per-user scores of TAG_LEVEL=1000.0 QUARANTINE_LEVEL=1000.0 KILL_LEVEL=6.0 tests=WEIRD_PORT X-Barracuda-Spam-Report: Code version 3.2, rules version 3.2.3.37420 Rule breakdown below pts rule name description ---- ---------------------- -------------------------------------------------- 0.50 WEIRD_PORT URI: Uses non-standard port number for HTTP Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id v2MI0tws023477 Reply-To: geda-user AT delorie DOT com On Wednesday 22 March 2017 13:25:51 karl AT aspodata DOT se wrote: > Is it possible to handsolder QFN packages, something like [1] ? > > Hälsningar, > /Karl Hammar > > [1] http://assets.nexperia.com/documents/data-sheet/PUSB3FR4.pdf > I think a reflow oven would be faster, and there are numerous diy instructions on the net as to how to do this with a modified toaster oven. You would have to start with a scrubbed clean pattern on the board, anointed with a drop of solder paste, place the device on the paste in about the correct position and heat. The reflow is a wetting process by the solder, and it will suck a minor miss-alignment with the conductor pads into near perfect alignment as the solder "wets" the 2 surfaces. The modification parts may cost more than the basic oven, its a $20 bill at Walmart. You'll need to replace the mechanical temp controls with an SSR and a timer so it can reach a higher temp for a short time. How much is that device in 100's? I may have a place for quite a few. > ---------------------------------------------------------------------- >- Aspö Data > Lilla Aspö 148 > S-742 94 Östhammar > Sverige > 0173 140 57 Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page