Electronics Forum | Mon Oct 02 10:52:18 EDT 2023 | dontfeedphils
Can you install the part post-smt with no clean flux?
Electronics Forum | Thu Oct 05 14:03:47 EDT 2023 | stephendo
First check the datasheet to see if it says do not Xray. I have seen tiny microphones with a do not Xray warning.
Electronics Forum | Mon Oct 02 12:43:30 EDT 2023 | daniel_stanphill
I agree with dontfeedphils. Any time we run into a moisture sensitive component that cannot go through our wash cycle, we solder the component(s) by hand after everything that can be washed has been reflowed and cleaned.
Electronics Forum | Tue Oct 03 11:29:56 EDT 2023 | stephendo
Why ultrasonic cleaning? If the ultrasonics are causing problems then nothing will protect the mic. What about peelable mask?
Electronics Forum | Tue Oct 03 18:15:24 EDT 2023 | daniel_stanphill
I had the same thought. We use a peelable mask to protect components during conformal coating. It could potentially give it complete protection with relatively easy removal.
Electronics Forum | Sat Oct 07 12:52:11 EDT 2023 | ttheis
I don't know why you would NOT use a no clean paste. You're just adding time and cost to the assemblies, not to mention potential problems. Changing paste is the best option here unless you have a very compelling reason not to.
Electronics Forum | Mon Oct 09 21:22:10 EDT 2023 | emeto
You can try expensive wash pallet that protects the part in question, or you can solder with NC solder after all wash is done.
Electronics Forum | Fri Nov 03 21:16:40 EDT 2023 | calebcsmt
Depending on the assemblies you're producing, I highly recommend 8.9HF from Indium for a low residue SAC305 alloy. We have been using this for years in our NC process and residues are very little, with appropriate stencil apertures and paste printing
Electronics Forum | Thu Oct 05 13:48:20 EDT 2023 | tommy_magyar
Whatever the cleaning process is or will be, after cleaning make sure you check on X-Ray for any solder balls/debris in microphones. This is a friendly reminder to check, unless you want to receive customer complaints. Been there, seen that - we went
Electronics Forum | Tue Oct 03 18:09:06 EDT 2023 | glasscake
Try a liquid latex masking material. Youll most likely have to cover the hole with kapton, really drench the thing in the liquid latex to prevent the ultrasonic from damaging it then bake it at 50-70c for about 2-4 hours. With no bake its usually a 2
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