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Complexity Index of PCB for characterising reflow profiles

Kris

#25434

Complexity Index of PCB for characterising reflow profiles | 11 August, 2003

How can one go about defining the complexity of a PCB for characterizing reflow profiles

A large balanced board may be easier to profile than smaller unbalanced board ?

Any ideas how to define an index to calculate the complexity based on size,weight, thickness, distribution of thermal mass, type of components etc etc

thanks all

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#25438

Complexity Index of PCB for characterising reflow profiles | 11 August, 2003

Our old friend Bob Willis posted at his site [ http://www.bobwillis.co.uk ] a document that may be a good starting point. In the "Download" section, look for "New Product Design Evaluation Form (Word.doc file)".

Certainly the number of solder connections per square inch is a measure of complexity, but that may not get at what you're seeking. Possibly pre-reflow board weight per square inch, with a factor for board thickness?

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Cameron

#25480

Complexity Index of PCB for characterising reflow profiles | 15 August, 2003

Take a look at the product here: http://www.kicthermal.com/products/KIC-Auto-Focus.pdf

KIC uses a previously profiled product library to calculate in spec reflow profiles for new products. Just enter you dimensions and if finds a solution for you.

Cameron

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Kris

#25503

Complexity Index of PCB for characterising reflow profiles | 19 August, 2003

Hi,

Yes did use that. but how to claassify a board based on complexity still remains ? Davef made a begining

will appreciate if we have more comments

Thanks

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reflow oven profiler

Reflow Oven