Electronics Forum: fine pitch components (Page 7 of 222)

Coplanarity on fine pitch QFP

Electronics Forum | Mon Sep 25 16:14:16 EDT 2000 | LarryK

What do you all do to fix coplanarity on fine pitch QFPs? I know that the best thing would be to send them back to the vender, but what about the when you gotta use them? Straightening by hand seems to be so time comsuming. Any better ways? Larry

Re: baked on water soluble flux residue betwwen fine pitch comp.

Electronics Forum | Fri Dec 01 17:03:57 EST 2000 | Dave F

Curious, very curious ... Residues � Where are these residues? [solder & laminate / mask, solder only, laminate / mask only] What is the result of your analysis to the residues? How do you know it�s a flux residue, rather than a chemical by product

Non wetting on fine pitch product

Electronics Forum | Thu Sep 07 08:44:17 EDT 2006 | vicknesh28

Did check the coplanarity of the failed lead and found it to be as good as the wetting leads.

Non wetting on fine pitch product

Electronics Forum | Thu Sep 07 18:32:51 EDT 2006 | vicknesh28

Yes the part is reworked. It solders when it's reworked.

Less solder with fine pitch qfp

Electronics Forum | Thu Oct 02 08:26:41 EDT 2008 | rway

We had similar issues until we went to a 6 mil stencil thickness.

Trouble selective soldering fine pitch connectors

Electronics Forum | Fri Dec 07 02:53:26 EST 2012 | beta

no expert but would using a smaller diameter nozzle help in anyway?

Trouble selective soldering fine pitch connectors

Electronics Forum | Fri Dec 07 02:55:24 EST 2012 | aj

I am no expert but would using a smaller nozzle help in anyway?

Trouble selective soldering fine pitch connectors

Electronics Forum | Wed Dec 12 16:16:39 EST 2012 | tombstonesmt

Nitrogen at nozzle supply is at around 47.5cfh.

Re: Coplanarity on fine pitch QFP

Electronics Forum | Mon Sep 25 17:06:36 EDT 2000 | JAX

LarryK, You might want to talk with: Fancort Industries, Booth #2630 31 Fairfield Place West Caldwell, NJ 07006 973-575-0610 www.fancort.com MLCS-1 Manual Lead Conditioning System. It is a bench top, hand operated machine to correct deformed lea

Less solder with fine pitch qfp

Electronics Forum | Tue Sep 30 14:06:04 EDT 2008 | realchunks

What pitch? You can go 5 mil or even 6 mil stencils depending on your screen printer. Also what do you consider "less solder"? What defect are you having. Remember on a QFP you use the heel filet to determine proper solder joint - not the toe.


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