What type of dielectric is used in an NP0 capacitor?

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Discussion Overview

The discussion centers around the type of dielectric material used in NP0 capacitors, specifically exploring the composition and characteristics of C0G (NP0) ceramics compared to other dielectric types.

Discussion Character

  • Technical explanation, Conceptual clarification

Main Points Raised

  • One participant inquires about the specific ceramic material used in NP0 capacitors, noting familiarity with X7R as barium titanate.
  • Another participant provides a link detailing that C0G (NP0) is a formulation of temperature-compensating EIA Class I ceramic materials, mentioning the inclusion of rare Earth oxides like neodymium and samarium.
  • The same participant highlights the stability of C0G (NP0) ceramics, noting their low capacitance change with temperature and minimal capacitance drift over time.
  • A third participant expresses appreciation for the information and comments on the flatter CV curve of C0G capacitors.
  • Another participant shares a link to a resource for general information on ceramic capacitor dielectrics.

Areas of Agreement / Disagreement

Participants appear to agree on the characteristics of C0G (NP0) ceramics as a stable dielectric, but there is no explicit consensus on the broader implications or comparisons with other dielectrics.

Contextual Notes

Some assumptions about the properties of NP0 capacitors and their comparison to other types of dielectrics remain unexamined, and the discussion does not delve into the specific applications or limitations of C0G (NP0) ceramics.

sodoyle
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TL;DR
What type of ceramic is an NP0 capacitor made from? I know X7R is barium titanite, but I can't find NP0.
What type of ceramic is an NP0 capacitor made from? I know X7R is barium titanite, but I can't find NP0.
 
Engineering news on Phys.org
https://www.avx.com/products/ceramic-capacitors/surface-mount/c0g-np0-dielectric/
"C0G (NP0) is the most popular formulation of the “temperature-compensating,” EIA Class I ceramic materials. Modern C0G (NP0) formulations contain neodymium, samarium and other rare Earth oxides. C0G (NP0) ceramics offer one of the most stable capacitor dielectrics available. Capacitance change with temperature is 0 ±30ppm/°C which is less than ±0.3% C from -55°C to +125°C. Capacitance drift or hysteresis for C0G (NP0) ceramics is negligible at less than ±0.05% versus up to ±2% for films. Typical capacitance change with life is less than ±0.1% for C0G (NP0), one-fifth that shown by most other dielectrics."
 
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Likes   Reactions: sodoyle
Thanks, that's exactly what I was looking for. Even though C0G is a temperature coefficient, it's also interesting that they're have a lot flatter CV curve.
 

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