Electronics Forum | Wed Aug 07 15:58:17 EDT 2024 | SMTA-64386252
Hello. Since a DFN is a BTC component, an end fillet height is not required on IPC 610 since most of these components did not have a wettable surface on the sides. A cross section in a non-touched up sample could be performed to validate the solder
Electronics Forum | Tue Jul 30 21:04:23 EDT 2024 | SMTA-68146200
Hello. I got an email from a customer who thinks we have a cold solder problem. I doesn't look like it wicked but since there are pads underneath, shouldn't that have bonded?
Electronics Forum | Thu Aug 08 10:25:51 EDT 2024 | carl_p
If the connection is poor you would need to consider was the solder volume correct & is the oven profile correct? Was the paste mixed correctly & within all operating windows such as exp date, time out etc etc
Electronics Forum | Thu Aug 01 19:47:13 EDT 2024 | SMTA-68146200
Thanks for your reply. My customer is telling me that once he touched it up and made a connection to the sides, he got a good signal. Is it possible that the connection underneath was poor? If so, what might be the cause of that?
Electronics Forum | Tue Jul 30 21:50:28 EDT 2024 | bsziszi
In case of DFN and QFN package the most of the connection is made on the bottom side of the terminal. According to the IPC is not mandatory to have the tip (side flank) to be wetted. Since it is difficult to visually inspect the solder joint, Xray is
Electronics Forum | Fri Nov 03 09:12:06 EDT 2023 | tommy_magyar
Yes, at least our boards are. Because the processes are set up correctly, the rework made on these boards is at most a couple of bad solder joints on DFN6 and DFN8 footprints. We really must be careful with handling though.
Electronics Forum | Mon Apr 05 22:52:40 EDT 2010 | davef
Sounds like you're not getting the solder connection hot enough. Talk about: * Temperature of the solder on the connection * Solder alloy * Board solderability protection * Component solderability protection
Electronics Forum | Mon Apr 05 21:46:12 EDT 2010 | isd_jwendell
I have been using this series with AIM SnPb no-clean paste without problems.
Electronics Forum | Mon Apr 05 16:12:16 EDT 2010 | dyoungquist
We are installing via reflow soldering a crystal that has 2 pads, 1 each end. They are flat pads on the bottom of the part with a small area of the pad looping around and up the side of the crystal on the end. Inspection of the cyrstal under a 40X
Electronics Forum | Thu Feb 27 18:07:13 EST 2014 | emesystems
The ISL12020 real time clock comes in a 20 lead DFN, and includes a 32kHz crystal in the package. The terminals of the crystal and oscillator come out to external pads and are highly susceptible to leakage to the neighboring power supply pins. With
