Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

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What does it take to rework qfp's?


Jon

#27619

What does it take to rework qfp's? | 11 March, 2004

Do I need a $6,000 tool to for this or can it be done for less? Thanks for any input!

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RDR

#27621

What does it take to rework qfp's? | 11 March, 2004

I would use a $49.99 hot air gun. The only issue is temp control some have it some don't. If they don't you have to be careful of getting PCB/Componret too hot. It should take about 1.5 min. to get it off.

Russ

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Jon

#27624

What does it take to rework qfp's? | 11 March, 2004

Really? A hot air gun? Sounds difficult to control. But $50.00 sounds good! Is this what your company practices? How do you avoid reflowing 603's surrounding the qfp?

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RDR

#27627

What does it take to rework qfp's? | 11 March, 2004

the ones we use have a temp adjust/control. To answer reflowing adjacent components we reflow them during the rework. However if we do not want to reflow we either change the tip on the gun to a more localized area or we apply temporary mask to prevent reflow. Is there a concern with reflow 0603 type chips etc.. a 2nd or third time? I have never paid these much attention in the past.

Russ

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RDR

#27628

What does it take to rework qfp's? | 11 March, 2004

Jon, one other option. Metcal makes tips for the MX stations that are for removing All sorts of Ic components. They are custom sized for each QFP size. If you have the MX stations this is a great way to go. These tips only heat the leads and parts come off fast. The downside is if you need to re-use the component they are usually a little bent from the tip contact. I believe that their cost ranges from $30-100.

Russ

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Primus

#27691

What does it take to rework qfp's? | 20 March, 2004

QFP stands for "Quit Fussing with the Paste."

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