NFC Type 4 can operate within a distance of 10 centimeters. NFC, which is compatible with ISO 15693 that is capable of NFC phones, can operate within a distance of 100 centimeters.
The size of an NFC antenna is related to
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#PCB Design
What I would like to know is if ICs also have a limited shelf life and if so, do some types suffer more than others?
We receive a batch of PCB with scratches from my supplier, but they think it is acceptable. I have never seen such error on even an B stock boards parts. Very confused. How do scratches affect PCB working?
I am prototyping a PCB, using Chip Quik’s “SMDSWLF.031, a Sn96.5/ Ag3.0/ Cu0.5 solder with 2.2% no-clean flux. I find that the black spots appears frequently in larger pads on my board. I wonder if it is because I left the soldering iron more time heating the solder and that burnt the flux. What is that black residue? Is that a sign of a bad joint or maybe bad soldering technique?
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