Electronics > Manufacturing & Assembly

Soldered Castellated XL51822 short

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thm_w:
Solder type, no.
Flux, possible, if it was not a "no-clean" type, and then you didn't clean it after.
PCB finish, no.
Solder temp, unlikely, as I said you just touched the edge of the PCB and nothing else.

michelvachon:
I never tried no-clean flux.
I use that regular dark yellow MG Chemicals flux.
Picture attached.

I tested soldering the module detached from the PCB.
This seems to work.
Maybe because I was able to clean the flux properly.
Picture attached.
So I ordered no-clean flux, will try it out.

thm_w:
Yes if you read the datasheet: https://www.mgchemicals.com/downloads/tds/tds-8342-l.pdf
They state that cleaning is required. If a flux is not specifically advertised as "no-clean", assume it requires cleaning.

It could be that or the standoff height you added. Which also means the other castellations have not chance of touching (if there was a PCB error).

michelvachon:
Looks like the flux was the problem.

I was able to solder that 51822 on my pcb and no issues so far.

That's such a relief!

This might explain some weird behaviour I had in the past with esp32 modules.

Thanks for your time and help thm_w!

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