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minimal distance between THT solder pads

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#80249

minimal distance between THT solder padsfor selective soldering | 15 April, 2018

Dears, I would like to aks you, about minimal distance between solder pads for THT components for selective RoHS soldering. Is there some standarts, where I can find this information? Enclosed is draft, what I mean. Thank you very much for your support. Mekmat.

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#80263

minimal distance between THT solder padsfor selective soldering | 18 April, 2018

Here is the IPC Standards Tree [ http://www.ipc.org/4.0_Knowledge/4.1_Standards/SpecTree.pdf ]. The design standards that you ask about are over on the right side.

I'd guess that the following standards would be a good starting point:

* IPC-2221, "Generic Standard on Printed Board Design,"

* IPC-2222, "Sectional Design Standard For Rigid Organic Printed Boards."

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#80266

minimal distance between THT solder padsfor selective soldering | 18 April, 2018

I did not read through this but hopefully there is something of value here:

https://www.smtnet.com/library/files/upload/Design-Rules-Selective-Soldering.pdf

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dwl

#80268

minimal distance between THT solder padsfor selective soldering | 18 April, 2018

One thing to consider is the length of the leads protruding from the solder side of the PCB will have an effect. Longer leads will be more prone to bridging than shorter leads with the same spacing.

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#80269

minimal distance between THT solder padsfor selective soldering | 18 April, 2018

If someone can find a RoHS specific standard I would be interested. IPC-2221 nor 2222 separate leaded from lead free (that I could see).

Charlie

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#80285

minimal distance between THT solder padsfor selective soldering | 20 April, 2018

The biggest factor is the selective solder machine. Do you want to know the minimum distance that all selective solder machines can handle with no difficulty? If so that will be a fairly large distance. If you are designing for in house boards then you will have to check what your machine can handle.

Also there may be electrical standards that have to be met.

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