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QFP PACKAGE MANUAL SOLDERING

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#56727

QFP PACKAGE MANUAL SOLDERING | 29 September, 2008

do we have any fixture for manual soldering some packages like QFPs if yes please tell me the name of supplier

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#56737

QFP PACKAGE MANUAL SOLDERING | 29 September, 2008

Thanks but we have QFP208 package here that after the reflow soldering during to the bad coplanarity of these devices some pads doesn`t have enough solder or not soldered. so we decided to use a qfp nozzle that can be placed on a QFP pads and use a hot air to resolder all pads so i want a rework station that can send hot air through a QFP nozzle please send any suggestion and introduce any rework station with this capability

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#56739

QFP PACKAGE MANUAL SOLDERING | 29 September, 2008

Why didn't you say that in you original posting? Among the better suppliers of rework systems are: * SRT http://www.vjelectronix.com/vjebeta/products.asp?title=Rework%20Solutions

* AirVac http://www.air-vac-eng.com/

* Metcal http://www.metcal.com/

* ERSA http://www.ersa.de/en/

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#56766

QFP PACKAGE MANUAL SOLDERING | 1 October, 2008

we need a soldering nozzle for this package that can be placed by the rework machine on a pads of this qfp (to make the pads planar) and then send a hot air and after the solder joint melt stop the hot air and pull up the nozzle do we have such machine ?

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#56768

QFP PACKAGE MANUAL SOLDERING | 1 October, 2008

You might need to straighten the leads prior to soldering.

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#56773

QFP PACKAGE MANUAL SOLDERING | 1 October, 2008

Wouldn't it be cheaper to by quality parts?

Most repair operators can solder a QFP 208 with a regular soldering iron, eyes closed and hands behind their back. If you are just touching up the leads because of co-planer leads, a regular iron is all you need.

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#56778

QFP PACKAGE MANUAL SOLDERING | 1 October, 2008

we should assemble 24000 of this board so we should find another solution and we get three sample of this part and all of them has this problem , and now we dont have time to wait for new part to come.

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arebom

#56787

QFP PACKAGE MANUAL SOLDERING | 2 October, 2008

If you have coplanarity issues on components that have not been assembled yet, check out an equipment that will help you resolve the lead coplanarity problem before you load them in your assembly equipment; I know that Fancort sells an equipment for this purpose, and I'm sure there are more vendors that do the same.

and from my point of view, NEVER force a lead into position while soldering cause that will introduce a whole lotta tension in the joint. And as Chunks says fix the assembled components with a solder iron ...

I so need a cooler name on this site ~le sigh~

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#56799

QFP PACKAGE MANUAL SOLDERING | 2 October, 2008

Thanks a lot if anybody know any source that have this kind of equipment please tell me .

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#56800

QFP PACKAGE MANUAL SOLDERING | 2 October, 2008

~le sigh~ makes a good point about forcing bent leads into the solder, letting the solder cool, and releasing the force on the lead. On the other hand, reforming leads of components prior to assembly is dangerous, also, because the "bending of a lead severely damages the package and may affect the reliability. The stress induced may result in microscopic cracks or chips in the package, and reduced adhesion, particularly where the lead enters. This reduces the ability of the package to resist ingress of moisture and may lead to failure through internal corrosion." [M Tarr, University of Bolton]

Together these concerns get you to the point that Chunks was talking about ... there's just much less heart ache when you bring-in good parts.

Good luck.

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#56801

QFP PACKAGE MANUAL SOLDERING | 2 October, 2008

Weller� WLSK1000 QFP Lead Repair Kit * [CooperTools PO Box 728, Apex, NC 27502; http://www.coopertools.com ] * [Practical Components, Inc; 10762 Noel St, Los Alamitos, CA 90720; 714-252-0010 F714-252-0026 http://www.practicalcomponents.com/tools_supplies_training/wellerqfp.htm ]

There are service companies that specialize in lead forming of the type you describe.

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#56833

QFP PACKAGE MANUAL SOLDERING | 7 October, 2008

Hi - you did forget FINETECH - here are some videos: http://www.finetech.de/enid/video

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