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Lead Tinning for Solderability

There are cases where older legacy components do not meet the solderability requirements for PCB assembly. This could be due to either contamination on the components leads or severe oxidation. Lead tinning describes the tinning or solder coating of SMT, through hole and odd form electronic components to mitigate this lack of solderability. BEST provides such lead tinning services.

 

Tinned vs Oxidized graph

 

Lead tinning for solderability makes sure that the component solderability is acceptable and can be used for placing in to automated assembly equipment including wave , selective or reflow soldering. In many cases the oxidation or contaminated layer needs to be removed and or cleaned prior to the lead being dipped in to the processing alloys. When the process is ably controlled a uniform , solderable surface finish is presented and it can then be used in the automated assembly process. Part of the retinning process in these cases involves the cleaning of the parts, inspection and re-packing them in to reel/tape, matrix trays or other packages.

In many cases the refurbishing of legacy components via lead tinning is accomplished after a design of experiments augmented by the company’s experience is performed. This leads the process engineers to the correct flux chemistries and subsequent cleaning and process parameter selection in order to make this process sustainable. Legacy components may have been in storage for many years and may require process development steps for the refurbishing of these legacy components. Lead tinning for solderability improvements  will refurbish these legacy component surface finishes.

A common example of how this lead tinning refurbishment service works is that a customer, having to go ahead with building a very old design using obsolete and excess inventory, opens the component packaging only to find that the leads have a severe oxide layer formed around them. This oxide layer is thick enough such that the leads do not meet the solderability requirements. A wetting balance measurement, made per IPC J-STD-002 is made to confirm the lack of solderability. In other cases unauthorized distributors can send parts in to the user only that the user discovers that they have unsolderbale components.  The refurbishment of these legacy components begins by running samples using a variety of different flux and cleaning solutions followed by hot solder tin dipping them in the appropriate soldering alloy with the intention of replacing the old finish with a fused intermetallic finish. Finally, after the lead tinning process is “dialed in” the wetting balance test confirms an increase in wettability.

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Testimonials

  • You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    Welch Allyn

  • BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    RW Technologies

  • BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the... View More..

    BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the demands placed on them by the customer, and are very honest about what they can do and when they can do it. They offer great value to the customer; they are willing to go the extra mile to make the customer happy.

    Motorola

  • Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed... View More..

    Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed boards repaired immediately. They have always come through for us.

    Lovejoy Controls Corporation

  • Your company name exemplifies exactly what you are, the BEST!!!

    Your company name exemplifies exactly what you are, the BEST!!!

    Alpha Circuits

  • You guys are really soldering geeks. Keep inventing those cool products.

    You guys are really soldering geeks. Keep inventing those cool products.

    Analog Devices

  • …always are very friendly and try to accommodate my short lead times

    …always are very friendly and try to accommodate my short lead times

    Qualcomm

  • There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    Alabama Power

  • Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility,... View More..

    Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility, and work ethic. We really appreciate the fact that he went above and beyond.

    EMAC

  • Man, you guys are unbelievably fast!

    Man, you guys are unbelievably fast!

    Blur Development Product

Throughole Part Tinning

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WHAT PEOPLE ARE SAYING ABOUT US

  • You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    You Guys Freaking Rock with turnaround time.
    Thank you all SOOOOO much!!

    Welch Allyn

  • BEST is excellent in meeting delivery dates and are very good with clear communication of... View More..

    BEST is excellent in meeting delivery dates and are very good with clear communication of shipments, quantities, issues, etc. Their quality and technical assistance has been superb.

    RW Technologies

  • BEST has solid high quality service every time, and at the right price. They are very dependable. I... View More..

    BEST has solid high quality service every time, and at the right price. They are very dependable. I am able to start a project in less then 24 hours with no hassles. The teams always work to meet the demands placed on them by the customer, and are very honest about what they can do and when they can do it. They offer great value to the customer; they are willing to go the extra mile to make the customer happy.

    Motorola

  • Best has always come through when we needed them. We started using them for board repairs, now they... View More..

    Best has always come through when we needed them. We started using them for board repairs, now they assemble all of our boards. BEST is always responsive to our needs. On many occasions, we needed boards repaired immediately. They have always come through for us.

    Lovejoy Controls Corporation

  • Your company name exemplifies exactly what you are, the BEST!!!

    Your company name exemplifies exactly what you are, the BEST!!!

    Alpha Circuits

  • You guys are really soldering geeks. Keep inventing those cool products.

    You guys are really soldering geeks. Keep inventing those cool products.

    Analog Devices

  • …always are very friendly and try to accommodate my short lead times

    …always are very friendly and try to accommodate my short lead times

    Qualcomm

  • There was not doubt that Francisco know the material, how to present it, and how to make the class... View More..

    There was not doubt that Francisco know the material, how to present it, and how to make the class participants feel at ease..all of my guys came to me and how me how much they had learned.

    Alabama Power

  • Just wanted to let you know what a fantastic job/effort James put in too insure our guys were... View More..

    Just wanted to let you know what a fantastic job/effort James put in too insure our guys were thoroughly training and qualified. Everyone involved was very impressed with his knowledge, flexibility, and work ethic. We really appreciate the fact that he went above and beyond.

    EMAC

  • Man, you guys are unbelievably fast!

    Man, you guys are unbelievably fast!

    Blur Development Product

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