Electronics Forum: lqfp 128 (Page 1 of 1)

LQFP128 doesn't work when cold

Electronics Forum | Tue May 30 13:50:40 EDT 2006 | Dragan

Hi, I ran into a problem and need a solution. It is a 3cm*4cm*1mm 2 layer PCB (6x6 panel) with a LQFP128 package Microcontroller, a resonator and 2 capacitors. What happens is: When i recieve the assembled pcbs from the assembly plant they wor

LQFP128 doesn't work when cold

Electronics Forum | Tue May 30 17:17:08 EDT 2006 | Dragan

Hi, I ran into a problem and need a solution. It is a 3cm*4cm*1mm 2 layer PCB (6x6 panel) with a LQFP128 package Microcontroller, a resonator and 2 capacitors. What happens is: When i recieve the assembled pcbs from the assembly plant they wor

LQFP128 doesn't work when cold

Electronics Forum | Wed May 31 13:23:48 EDT 2006 | slthomas

You don't say anything about the appearance of the solder joints themselves. That would go a long ways towards identifying and possibly resolving your issues. Heating and cooling could affect performance if you have a/some cracked or otherwise loose

LQFP128 doesn't work when cold

Electronics Forum | Wed May 31 16:09:14 EDT 2006 | barryg

Did You verify operation of the oscillaators(resonaters) by heating and cooling and looking at the waveforms and frequencies when doing so. We have problems when they are not packed correcttly from vendors , and sometimes they can get crackes in them

Heat Sink for QFP

Electronics Forum | Fri Mar 24 14:06:07 EST 2006 | mdemos1

Hi. We are designing in a 128 pin LQFP that has a heat sink in the center of the package. The size of this is 7.44 by 7.55 mm. Can anyone recommend what pad size should be on the board for this? How about stencil aperture/pattern? Thanks, Mike.

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