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maximum number of reflow cycles for rigid PCB?

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KEN

#48414

maximum number of reflow cycles for rigid PCB? | 15 March, 2007

Anyone know which IPC document covers this?

Me thinks 6....but want the IPC spec. to back this up.

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cecil

#48418

maximum number of reflow cycles for rigid PCB? | 15 March, 2007

Just askin but why would someone even want to subject an assembly to even 6 reflow cycles?

As far as how many cycles that an assembly can be subjected to, wouldn't that be determined my your components?

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#48422

maximum number of reflow cycles for rigid PCB? | 15 March, 2007

To do a profile at most companies, if you don't have a scrap board handy, you'll use the already-soldered board that's already been through ONE reflow cycle.

You spend time attaching T/C's with the aluminum tape - after all, the prep-work is half the battle - and then may have to run the board again (with T/C's still in-tact) to optimize your profile.

A seasoned guy can usually use prediction software once, and then nail the profile on the 1st or 2nd try. 6 times seems a little excessive.

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#48435

maximum number of reflow cycles for rigid PCB? | 15 March, 2007

There is no IPC document, nor should there be.

Look here: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=48102

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KEN

#48436

maximum number of reflow cycles for rigid PCB? | 15 March, 2007

Cecil, the board is a component.

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