I was just looking at some ceramic capacitor data sheets, and I wanted to see just how *bad* the Y5V capacitor material specs are:
https://www.electro-tech-online.com/custompdfs/2007/03/cy5v.pdf
Personally I avoid these for my designs, but I was thinking that some applications might be able to use these features - namely the horrible temperature and bias ratings:
~60% of the capacitance is lost by the time it reaches 60C over room temp
They're cheaper than thermistors, but are only usable over the room temperature range and above. They would definitely require a lot of care in the calibration process - but outfitting an entire board with an array of these would be really cheap, and would let you map out the temperature distribution in an interesting (but not obviously useful) way.
~80% of the capacitance is lost when the bias voltage reaches 40% of it's rating, and the transfer curve is very steep in the first 25%.
6.3V/10uF capacitors are US$0.2 or so, and will lose 7uF when the bias voltage reaches ~1.5V. That is a ludicrous amount of capacitance change. Mind you that it is only applicable for small signals, but imagine an adjustable capacitive attenuator or an isolated voltage sensor using a large Y5V sense cap and a pair of (good/C0G) bypass/isolation caps...
Has anyone seen anything that does anything creative with these parameters?
https://www.electro-tech-online.com/custompdfs/2007/03/cy5v.pdf
Personally I avoid these for my designs, but I was thinking that some applications might be able to use these features - namely the horrible temperature and bias ratings:
~60% of the capacitance is lost by the time it reaches 60C over room temp
They're cheaper than thermistors, but are only usable over the room temperature range and above. They would definitely require a lot of care in the calibration process - but outfitting an entire board with an array of these would be really cheap, and would let you map out the temperature distribution in an interesting (but not obviously useful) way.
~80% of the capacitance is lost when the bias voltage reaches 40% of it's rating, and the transfer curve is very steep in the first 25%.
6.3V/10uF capacitors are US$0.2 or so, and will lose 7uF when the bias voltage reaches ~1.5V. That is a ludicrous amount of capacitance change. Mind you that it is only applicable for small signals, but imagine an adjustable capacitive attenuator or an isolated voltage sensor using a large Y5V sense cap and a pair of (good/C0G) bypass/isolation caps...
Has anyone seen anything that does anything creative with these parameters?