Electronics Forum | Fri Nov 09 10:37:38 EST 2007 | devajj
We have started using QFN packages in large volume and are having problems with no-solders. We are using 6mil stencil with 1x1 paste print to pad. These also have thermal pads with thru vias that we reduce the stencil aperture by 1/4. Board also ha
Electronics Forum | Wed Jan 14 17:31:24 EST 2009 | swag
Doesn't sound like we use it exactly like your application. Similar to what davef says we use it for smaller to medium size or dense parts (sigle dot under the center of the part) that have potential to fall off on 2nd side processing. I can say it
Electronics Forum | Tue May 26 10:23:53 EDT 2009 | mun4o
hi, i am proccess eng solder wave process.I have problem with a PCB.There have ceramic SMD capacitor, SMD thermistor and SMD inductor 1uH.After reflow all is OK, but after SW these components are broken???The pin is separated from the body???the que
Electronics Forum | Fri Aug 15 12:40:49 EDT 2014 | davef
Hi Dave, We can help. Please ask this consultant to contact us directly. There are a number of possible reasons and we'll have many questions to get to the root cause. We are always happy to help solve customer problems. Thanks and Best Regard
Electronics Forum | Thu Oct 05 09:45:23 EDT 2017 | davef
troubleshoot rfi ... for advice. Bottom line: I don't think staking your "inductors" to the board will alter their performance. Continuing, I don't think it will fix your problem, either. Bonus comment: I'd talk to a board supplier app engineer bef
Electronics Forum | Thu Feb 13 19:08:31 EST 2014 | darby
Have to agree with Sr Tech and Spoilt - you'd have to really mistreat your paste these days for it to be the root cause. However, try another paste to eliminate that; making sure you abide by the suppliers specs. Pad design, stencil design,(includin
Electronics Forum | Tue Aug 04 10:43:48 EDT 2009 | kpm135
Thanks for the suggestions! It ended up being that a wire on the amplifier card in the lower drawer came loose and was making intermittent contact. Tightened all the wires down and the problem has gone away. Now we have a new problem. We had to repla
Electronics Forum | Fri Apr 04 18:16:43 EDT 2014 | garym4569
We are in the process of launching a new product and found reflow solder issue with one of the inductors. I have set oven profile to paste specifications. I just finished profiling with thermocouple under problem component. All other components ex
Electronics Forum | Fri May 23 19:59:26 EDT 2014 | jhaye
hi everyone, I just got some question with regards to the life span of components from the date it was packed from supplier. Does the parts more than 2 years from the date it was process by supplier: 1. Can it still be used in PCBA?? 2. will it not
Electronics Forum | Thu Mar 05 12:58:01 EST 2020 | joeljacobo
Hi everyone, I hope you can help me with this matter. We have a Hanwha SM482 machine and a series of projects involving many 0201 components (resistors, capacitors, inductors, etc.) will be carried out. Making the prototypes I noticed that there is
