Used for very high ohmic circuits, e.g. "electrometer" amplifiers to prevent against leakage currents caused by air moisture. More common for multi GOhm resistors.
Used for very high ohmic circuits, e.g. "electrometer" amplifiers to prevent against leakage currents caused by air moisture. More common for multi GOhm resistors.
Not the link I posted, these are resistors, but the ones I have yes they are capacitors, chip smd capacitors encapsulated into glass and leads are soldered onto them and extend outside of the glass. I wonder what is the use of such a component they must have a reason to encapsulate it into this expensive package.
Glass encapsulation is used when you want to completely seal the component from any effects of humidity and moisture.
It's expensive but more effective than any other sealing method.
Glass encapsulation is used when you want to completely seal the component from any effects of humidity and moisture.
It's expensive but more effective than any other sealing method.
I have seen also glass encapsulated varistors in common ADSL modems and telephone answering machines!
It could be also thermal issues as well as high voltage-related issues, as glass is a good thermal and voltage isolator.
There might be also applications (gas sensors?) where the chemical may corode the "paint" around the resistor and glass could be a perfect solution, although I have not investigated if this is true.
The first link gives a good overview of what FvM mentioned, thanks!
The second is not related to glass encapsulation of capacitors but it refers to glass dielectric capacitors, which is another story.