(Topic ID: 191137)

So any tips on more pinpoint soldering?

By jeff_286

2 years ago

Topic Stats

  • 15 posts
  • 10 Pinsiders participating
  • Latest reply 2 years ago by terryb
  • Topic is favorited by 4 Pinsiders


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    esdbench-nov-2013 (resized).jpg

    #1 2 years ago

    My finesse is lacking when it comes to transistors in tight spots where gobs just won't do.

    #2 2 years ago

    A fine tip on your soldering iron is essential for semiconductor work

    #3 2 years ago
    Quoted from jeff_286:

    My finesse is lacking when it comes to transistors in tight spots where gobs just won't do.

    With the right technique you can solder surface mount chips with a chisel iron tip that can span across three of the leads or more. You have to use the properties of solder, the component leads, and the board.

    Solder only wants to stick to the exposed pads / through holes, it does not want to stick masked traces or unrouted parts of the PCB material.

    Molten solder has good surface tension. The key is applying the correct amount of solder after the joint is heated up. The solder will stick and form where it should go. If heated properly and the right amount of solder is added it will build up perfectly on its own.

    If you bridge two adjacent legs together. Clean off your iron tip to dry. Remelt both joints at the same time and let the iron tip to wick up some of the solder then pull off the two joints. Repeat until you get the right amount of solder and the bridge breaks free by itself. It will totally want to break free by itself too, because the resisting material between the two pads... just equal heat and the right amount of solder and surface tension take care of the rest. Solder wick can help, but I rarely use it.

    technique technique technique.

    I don't think you want smaller pin point iron tip. You want a chisel tip and more practice.

    #4 2 years ago

    I don't have it in front of me and even if I did I'm at the cottage and I'm on my BlackBerry and have trouble linking with it but if I remember, terryb has a great thread on soldering. Maybe someone can post a link to it.

    #6 2 years ago

    The proper temperature controlled solder station with the correct interchangeable soldering iron tips, patience, and practice.
    Learn how to keep your tools clean and serviceable, and not just throw them in a tool box.

    When working with semiconductors and electronic components, proper preparation and cleaning of the board is essential.
    This ensures that electrical contact of circuits is precise, and you do not overheat the board.
    Always ensure you are electrically grounded when doing repairs of electronic components, there are NO exceptions to this rule.
    Soldering coils and wires is not soldering PCBs.
    Soldering through hole component mounted PCBs is not SMD work.
    Knowing the difference is important, and the tools are different.

    Reading any guide is only a first baby step, and part of the reason why so many novices makes errors.
    The birth of the internet was not always a boon for IPC standards.
    Take a local soldering class at the trade workshop or community college.
    You will improve your skills dramatically, with less trial and error, and reduce chances of ruining hard to find boards.
    Many older early SS PCBs are salvageable, even 40 years later, if not hacked.

    #7 2 years ago

    When working with very small surface mount components and fine pitch devices, good magnification is highly desired.

    esdbench-nov-2013 (resized).jpg

    #8 2 years ago

    Thanks for the input. Never considered a bigger TIP would make sense but with 3 prongs involved it does.

    #9 2 years ago

    Practice, practice, practice - did I mention Practice????

    #10 2 years ago
    Quoted from wayout440:

    When working with very small surface mount components and fine pitch devices, good magnification is highly desired.

    Great setup!

    Would you mind giving some details?

    #11 2 years ago
    Quoted from Steevsee64:

    Great setup!
    Would you mind giving some details?

    That one is not mine, but we do have the same magnifier setup. It has a switch to change the output from optics to LCD. This comes in handy for taking close up photos that you can't get otherwise. The brand we use here is Scienscope, and runs about $3000.00

    #12 2 years ago

    A friend gave me one of those magnifier/light that clamps on a table. Helps alot when soldering small stuff.

    #13 2 years ago

    Is your question in regards to surface mount components or through-hole technology?

    #14 2 years ago

    Through hole.

    #15 2 years ago
    Quoted from jeff_286:

    My finesse is lacking when it comes to transistors in tight spots where gobs just won't do.

    Use a chisel tip with the width of the tip the same as the pad, or slightly smaller if needed. Use a fine solder like .031. Use a magnifier.

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