Electronics Forum | Tue Feb 11 10:41:30 EST 2020 | dunks
We had this problem at my old job. My understanding (from googling this problem previously) is that the exposed leads on the side of the qfn are not tinned and are not required/designed to have a fillet. Someone correct me if I'm spouting lies.
Electronics Forum | Thu Jun 23 22:30:31 EDT 2005 | wjxingggg
poor soldering of PCB. > unfit stencil hole of QFN > incoming problem for this component >...... What is your opinion? or what can I do for the next step? Thanks again.
Electronics Forum | Tue Feb 11 10:31:20 EST 2020 | emeto
Values and range definitions on your profile attachment are for LF paste not for Tin Lead. Please recheck and redefine, so we get the correct values. Also, which location is the QFN?
Electronics Forum | Tue Feb 11 13:03:05 EST 2020 | astarotf
Evtimov The areas analyzed are a standard oven curve according to the pasta we are using. The channels used are only for measuring the oven temperature profile, not in detail of the QFN component sector.
Electronics Forum | Thu Feb 20 07:48:16 EST 2020 | benreben
Hello, The oven profil is not the solution! The only solution for the solder mount on the side is to put gel flux on the side of qfn and make a second travel in reflow . The flux remove oxyde from the copper that is not tinned and the solder is able
Electronics Forum | Sun Feb 23 21:19:08 EST 2020 | sssamw
Yes, this is for tin-lead profile. And for the QFN pins which has copper exposed that not required and not possible to have fillet on side surface as in IPC, see 8.3.13, in IPC-A-610-G
Electronics Forum | Mon May 31 22:52:14 EDT 2010 | fujiphil
I think placing QFN in CP6 will be no problem....
Electronics Forum | Tue Feb 11 11:00:13 EST 2020 | astarotf
hello Evtimov Thanks for your answer. I will analyze the curve with our pasta supplier to reconfirm if it is adequate. It would also be helpful if you could share the tin lead curve profile to analyze. The location of the QFN is assembled by the top
Electronics Forum | Tue Nov 27 20:51:18 EST 2007 | chs
Anyone can share experience on package crack for QFN package. This package is so sensitive to any external force. Any good recomendation on desoldering / rework procedure.
Electronics Forum | Thu Mar 22 16:55:41 EDT 2007 | namruht
I am having trouble with the small 4 or 5mm QFN's. There is a small dot on the bottom corner of the component that the vision system is seeing as a lead. We are placing these with our Universal Advantis with a FJ09 head. I would really appreciate any
