Re: gEDA-user: Soldering minute smt
Great advice for soldering these small SMTs! The problem we're having is keeping the chip stationary while tring to tack/solder it. I'm going to come up with a type of fixture that holds the board and a spring loaded pin capable of traveling in the X-axis and Y-axis over the board and hold the chip to the PCB. I don't suppose anyone has made one? If not, I'll provide plans of what I come up with. On Thu, Jan 27, 2011 at 7:46 PM, Kai-Martin Knaak [1]k...@lilalaser.de wrote: DJ Delorie wrote: I think the only trick is to make sure your iron's tip is BIG enough to span three or more pins, so it glides along the top instead of hitting individual pins. IMHO, it works better, if the tip features flat surfaces. The solder happily flocks to a blob on the flat surface because this minimizes the area that interfaces with the air. Convex tip surfaces do not attract molten solder this way. Worst case is the cone of a pencil-like tip. ---)kaimartin(--- -- Kai-Martin Knaak Email: [2]k...@familieknaak.de Öffentlicher PGP-Schlüssel: [3]http://pool.sks-keyservers.net:11371/pks/lookup?search=0x6C0B9F53 ___ geda-user mailing list [4]geda-user@moria.seul.org [5]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user References 1. mailto:k...@lilalaser.de 2. mailto:k...@familieknaak.de 3. http://pool.sks-keyservers.net:11371/pks/lookup?search=0x6C0B9F53 4. mailto:geda-user@moria.seul.org 5. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt To:
Thanks William On Thu, Jan 27, 2011 at 7:09 PM, william estrada [1]mrumun...@cruzio.com wrote: I found this yesterday: [1][2]http://www.sparkfun.com/tutorials/59 Hope it helps? Message: 9 Date: Thu, 27 Jan 2011 10:47:37 -0500 From: Rob Butts [2][3]r.but...@gmail.com Subject: gEDA-user: Soldering minute smt To: gEDA user mailing list [3][4]geda-user@moria.seul.org Message-ID: [4][5]aanlktin1fsxvj4hnec1w9zedq4g5+jnxmmngmvw9e...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. Thanks -- William Estrada Mt Umunhum, CA, USA [5][6]HTTP://64.124.13.3 ( Mt-Umunhum-Wireless.net ) Skype: MrUmunhum References 1. [7]http://www.sparkfun.com/tutorials/59 2. mailto:[8]r.but...@gmail.com 3. mailto:[9]geda-user@moria.seul.org 4. mailto:[10]AANLkTin1FSxvJ4HnEC1w9ZEdq4G5+JnXMmNgmvW9EZJt@mail.gmail. com 5. [11]http://64.124.13.3/ ___ geda-user mailing list [12]geda-user@moria.seul.org [13]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user References 1. mailto:mrumun...@cruzio.com 2. http://www.sparkfun.com/tutorials/59 3. mailto:r.but...@gmail.com 4. mailto:geda-user@moria.seul.org 5. mailto:aanlktin1fsxvj4hnec1w9zedq4g5%2bjnxmmngmvw9e...@mail.gmail.com 6. http://64.124.13.3/ 7. http://www.sparkfun.com/tutorials/59 8. mailto:r.but...@gmail.com 9. mailto:geda-user@moria.seul.org 10. mailto:aanlktin1fsxvj4hnec1w9zedq4g5%2bjnxmmngmvw9e...@mail.gmail.com 11. http://64.124.13.3/ 12. mailto:geda-user@moria.seul.org 13. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
I don't suppose anyone has made one? http://dammitcoetzee.com/2009/07/how-to-make-soldering-fine-pitch-surface-mount-rediculously-easy/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
A good pair of tweezers works for me. note a good pair, not garden variety, I curse when I get to a lab that has bad/cheap tweezers. http://www.techni-toolcatalog.com/lg_display.cfm/catalog/128/page/243 I have a set of their ceramic tipped tweezers that are fantastic. Steve On Fri, Jan 28, 2011 at 9:09 AM, DJ Delorie d...@delorie.com wrote: I don't suppose anyone has made one? http://dammitcoetzee.com/2009/07/how-to-make-soldering-fine-pitch-surface-mount-rediculously-easy/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
gEDA-user: Soldering minute smt
Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. Thanks ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
On Thursday 27 January 2011 15:47:37 Rob Butts wrote: Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. These are incredibly difficult to solder without solder mask, in my experience. Whenever I've had a design that called for them, I've simply opted to contract out the board fab. :-/ Peter -- Peter Brett pe...@peter-b.co.uk Remote Sensing Research Group Surrey Space Centre signature.asc Description: This is a digitally signed message part. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
On Thu, 2011-01-27 at 10:47 -0500, Rob Butts wrote: Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. Aside from the first step - I would have hand-soldered a couple of corner pins, that is the way I would do it. Solder wick works great. I sometimes use a flux pen to flux up the component leads to aid the process of removing the bridges. It should also work on its own if you had good solder wick. (They have some milld flux in I think). -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me) signature.asc Description: This is a digitally signed message part ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
On Thu, 2011-01-27 at 15:53 +, Peter TB Brett wrote: On Thursday 27 January 2011 15:47:37 Rob Butts wrote: Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. These are incredibly difficult to solder without solder mask, in my experience. Whenever I've had a design that called for them, I've simply opted to contract out the board fab. :-/ Just let the Flux do the Job. I don't use Solder wire for SMD. Solder Paste is ideal no matter if you use stencils or not. The fact that solder paste is a mix of (mainly)Flux and solder powder makes the difference. Being that said, Flux + solder wick is your friend if you're using Solder Wire. Best Regards, Felipe. -- Felipe De la Puente Christen MSN/GTalk : fdelapue...@gmail.com ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
On 01/27/2011 08:47 AM, Rob Butts wrote: I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. If you've already got blobs wick off excess and use liberal amounts of flux and reflow - this allows the surface tension of the molten solder to separate at the pin/pad breaks and helps prevent bridging. I've gotten pretty good with the 10-pin MSOPs by hand: http://members.cox.net/ebrombaugh1/synth/audiodac/index.html My technique is to apply _no_ solder, plenty of flux gel and just allow the existing solder plating on the PCB to reflow. For the board fab I use this is sufficient to provide a good meniscus and the IC is well attached. I also have a very fine-point iron. Eric ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
On 01/27/2011 09:47 AM, Rob Butts wrote: Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. Thanks I do SC-70, 0.5mm and 0.65 often. As others have pointed out flux is your friend. What I do is put a small blob of solder on the tip of iron and then rotate the iron about 90deg. Bring the tip next to the pin and rotate the iron so the solder blob will wick onto the pin. You can actually control it by rotating the iron tip. Do 2 or 4 corners. Flux the entire part again. Put a dab of solder on the iron and start working across the pins. You can just drag the iron across them. More flux and solder wick will clean up any shorts. -- Joe Chisolm Marble Falls, Tx. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
I've done 0.5mm pitch TQFP on home-fabbed PCBs with an iron. Heck, I've done 0.4mm pitch too. It's easy if you know how. Here's how. You'll need: pen flux solder wire iron with normal-sized chisel or hoof tip (I use chisel) Procedure: Pen flux the pads on the PCB and the pins on the QFP (top and bottom). Place a small amount of solder on your iron. Place the QFP where you want it. Hold it there somehow. I use my fingers. You could also use tape or a tripod-like hold-down. Touch the iron to one corner of the qfp. It's OK if you get more than one pin soldered, just tack down that corner. Place a small amount of solder on your iron. Verify the QFP is still in the right place and tack the opposite corner. Verify (again). Put a small blob of solder on your iron and just run it down one of the un-tacked rows of pins. This will solder all the pins and probably short a few. Add more solder to the iron as needed, but you don't want to add it all at once. Repeat for the other four sides. Pen flux the shorts and remove them with copper braid. Done! ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
DJ Delorie wrote: Put a small blob of solder on your iron and just run it down one of the un-tacked rows of pins. This will solder all the pins and probably short a few. Add more solder to the iron as needed, but you don't want to add it all at once. Works for more coarse pitch, too. There's a classic on youtube: http://www.youtube.com/watch?v=wQXhny3R7lk The action starts at 1:00 ---)kaimartin(--- -- Kai-Martin Knaak tel: +49-511-762-2895 Universität Hannover, Inst. für Quantenoptik fax: +49-511-762-2211 Welfengarten 1, 30167 Hannover http://www.iqo.uni-hannover.de GPG key:http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmkop=get ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
Works for more coarse pitch, too. There's a classic on youtube: I think the only trick is to make sure your iron's tip is BIG enough to span three or more pins, so it glides along the top instead of hitting individual pins. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
Flux is the secret... Applying flux is the crucial step to success. +1 Get yourself some good quality flux, it makes this sort of problem disappear. I've used Electrolube SMFL (aerosol with dispenser tube) with good results, but there are many good options. Look for something with surface mount rework solder flux or similar in its description. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
I can't say enough about using flux for soldering. I often use the no clean flux with a metal tip dispenser. like mouser 577-SF-01 Although it seems that if you don't want to buy a gallon of liquid flux your getting a pen, which I dislike over the dispenser. It is a matter of taste. The other tip I have is that you have to use solder to desolder. Steve On Thu, Jan 27, 2011 at 2:55 PM, Stephen Ecob silicon.on.inspirat...@gmail.com wrote: Flux is the secret... Applying flux is the crucial step to success. +1 Get yourself some good quality flux, it makes this sort of problem disappear. I've used Electrolube SMFL (aerosol with dispenser tube) with good results, but there are many good options. Look for something with surface mount rework solder flux or similar in its description. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt To:
I found this yesterday: [1]http://www.sparkfun.com/tutorials/59 Hope it helps? Message: 9 Date: Thu, 27 Jan 2011 10:47:37 -0500 From: Rob Butts [2]r.but...@gmail.com Subject: gEDA-user: Soldering minute smt To: gEDA user mailing list [3]geda-user@moria.seul.org Message-ID: [4]aanlktin1fsxvj4hnec1w9zedq4g5+jnxmmngmvw9e...@mail.gmail.com Content-Type: text/plain; charset=iso-8859-1 Holy miniature footprints Batman!!! I'm trying to solder a 10 pin MSOP chip to a home made circuit board. The pitch of this chip is just 0.5 mm. We tried using the slightests of dabs of solder across the pins and then used a heat gun the melt the solder but now I have a chip soldered down with two five pin solder blobs on each side. My next step is to use solder wick to try and wick up the excess but I wanted to see if there is a better way of doing this first. Thanks -- William Estrada Mt Umunhum, CA, USA [5]HTTP://64.124.13.3 ( Mt-Umunhum-Wireless.net ) Skype: MrUmunhum References 1. http://www.sparkfun.com/tutorials/59 2. mailto:r.but...@gmail.com 3. mailto:geda-user@moria.seul.org 4. mailto:aanlktin1fsxvj4hnec1w9zedq4g5+jnxmmngmvw9e...@mail.gmail.com 5. http://64.124.13.3/ ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: Soldering minute smt
DJ Delorie wrote: I think the only trick is to make sure your iron's tip is BIG enough to span three or more pins, so it glides along the top instead of hitting individual pins. IMHO, it works better, if the tip features flat surfaces. The solder happily flocks to a blob on the flat surface because this minimizes the area that interfaces with the air. Convex tip surfaces do not attract molten solder this way. Worst case is the cone of a pencil-like tip. ---)kaimartin(--- -- Kai-Martin Knaak Email: k...@familieknaak.de Öffentlicher PGP-Schlüssel: http://pool.sks-keyservers.net:11371/pks/lookup?search=0x6C0B9F53 ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
