the humidity I'm referring to is external, for example: I have many devices with ceramic smd capacitors, humidity or any other long-term storage situation will cause changes in the values of the ceramic smd capacitor, causing it to die or operate problems?
No. Modern components are designed for a long service life even at 90+ % relative humidity. I pulled these tables from a Taiyo Yuden data sheet:
The only time I'd say humidity is an issue with SMD parts is during solder reflow. If the parts have too high moisture content they'll pop like popcorn when they go through reflow. That wrecks the parts. That's why there are these humidity indicator cards in the package when you buy the parts. If the indicator shows that the parts are too humid, you're supposed to bake them.
Tom
The only time I'd say humidity is an issue with SMD parts is during solder reflow. If the parts have too high moisture content they'll pop like popcorn when they go through reflow. That wrecks the parts. That's why there are these humidity indicator cards in the package when you buy the parts. If the indicator shows that the parts are too humid, you're supposed to bake them.
Tom
Can I store electronic devices that use ceramic SMD capacitors for an indefinite or long-term period without the risk of humidity or any other environmental factor changing the values of that capacitor?
I would worry much more about wet electrolytic components, than MLCC's. MLCC's are used in pacemakers, and space equipment, including the high K ceramics, albeit at reduced ratings, increased sizings.
Assuming nothing last forever, leave enough documentation to enable a future repair, preferably on a medium which is also forever rated (cloud?)
That is, if your apparatus is worth the trouble...
That is, if your apparatus is worth the trouble...
I know that nothing lasts forever, but in the case of ceramic smd capacitors, is it necessary to worry about long-term storage for an indefinite period of time, will this cause changes in its values and permanently render the capacitor unusable?
During long-term storage for an indefinite period of time, does the loss of capacitance occur in this type of ceramic smd capacitor until the capacitance reaches zero? If this happens, will this capacitor die?
I think this is a psychological experiment, repeating the same question over and over again although it has been answered dozens of times.