Electronics Forum | Wed Nov 14 01:00:20 EST 2007 | reypal
recently, we also have problem with QFN around 3% defect related to soldering. from the cross section it turns out to be solder crack. it could be the paste volume on the center pad is too much causing QFN to float that eventually will cause crack on
Electronics Forum | Fri Jul 11 15:47:54 EDT 2008 | hegemon
We used these same type of parameters regardless of the QFN package size. We used componentes that ranged from 3x3mm to 12x12mm Same idea. The reduction in solder paste for the center pad is the key. Too much, and you wind up with no connects at the
Electronics Forum | Fri Nov 16 18:07:54 EST 2007 | wayne123
The way that the last two companies that I have worked for do is, as soon as the I.C is programmed it is marked with a either a gray or Yellow sharpie (just a small dot) in addition we always tried to make sure that this dot was at the end of I.C whe
Electronics Forum | Mon Nov 12 09:22:41 EST 2007 | russ
Could be any one of the 3 you mentioned, need some details here, do you really think we can answer this question as it is? Now for your issue, what is the make up of the lead itself on the part? what is the reflow profile at this part? what is
Electronics Forum | Mon Nov 12 19:47:33 EST 2007 | sin4d
Hi, Thanks. Waitng for your reponse. BTW, if I were to perform a test as below will this give me some result to indicate if the component is defective. 1) Print solder paste on plain PCB without copper track. 2) Mount the QFP & reflow 3) If the sol
Electronics Forum | Tue Nov 13 11:56:22 EST 2007 | slthomas
"Better" means different things to different users. When we decided to upgrade I thought about a TP9 too but frankly it couldn't do much more than the Quads we already had. It just did it with a bigger footprint. We got a Topaz because we needed hi
Electronics Forum | Mon Nov 19 11:40:44 EST 2007 | wayne123
I have very accurately placed 0402's and 0603's with a topaz, I am very happy with the Topaz, and people that aren't happy with them simply do not know how to use them properly. These machines are capable of alot, I am sure you can find something bet
Electronics Forum | Mon Nov 19 16:10:50 EST 2007 | slthomas
Whatever you decide to do, make sure the machine you get meets your requirements for capability as well as cost. We've now got three machines referenced, all with vastly different capabilities, some of which you may have to sacrifice to get the oth
Electronics Forum | Tue Nov 13 02:47:47 EST 2007 | d0min0
from supplier of pcb I get .ger files, but in Dek OLE I need .gbx files to have a pcb picture as a help - Is it possible to covert one to another to use it properly in OLE??? (with CAD or CircuitCam or other???) or maybe I need .gbx files directly? I
Electronics Forum | Wed Nov 14 03:21:51 EST 2007 | d0min0
I started to look for the converter after couple of tries on renamed files, but when I read here that it should be 'the same' I renamed two files and it works now - what a heck??? thanx anyway looks like it's solved for me now :) I was almost ready t
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