High Voltage Ceramic Capacitor Code

5 min read Jun 26, 2024
High Voltage Ceramic Capacitor Code

High Voltage Ceramic Capacitor Code: Understanding the Markings

When working with high voltage ceramic capacitors, it's essential to understand the markings and codes printed on the component. These codes provide vital information about the capacitor's specifications, ratings, and performance. In this article, we'll delve into the world of high voltage ceramic capacitor codes and explore what each marking means.

What Do the Markings Mean?

A typical high voltage ceramic capacitor code consists of a series of letters and numbers. These markings can be confusing, but once you understand the breakdown, it's easier to decipher the information. Let's break down the code into its components:

First Character: Voltage Rating

The first character of the code represents the voltage rating of the capacitor. This can be a letter or a number, and it indicates the maximum voltage the capacitor can handle. Common voltage ratings include:

  • X: 250 VAC or 300 VDC
  • Y: 150 VAC or 200 VDC
  • Z: 100 VAC or 150 VDC
  • 1: 1 kV or 1000 VDC
  • 2: 2 kV or 2000 VDC
  • 3: 3 kV or 3000 VDC

Second Character: Capacitance

The second character represents the capacitance value of the capacitor. This is usually a number, and it indicates the capacitance in picofarads (pF). For example:

  • 104: 100,000 pF or 100 nF
  • 474: 470,000 pF or 470 nF
  • 225: 22,000 pF or 22 nF

Third Character: Tolerance

The third character indicates the tolerance of the capacitor's capacitance value. This is usually a letter, and it represents the percentage of deviation from the nominal value. Common tolerances include:

  • F: ±1%
  • G: ±2%
  • J: ±5%
  • K: ±10%
  • M: ±20%

Additional Characters: Other Specifications

Additional characters may be present in the code, which provide further information about the capacitor's specifications. These can include:

  • Temperature rating: Indicated by a letter or symbol, this represents the maximum operating temperature of the capacitor.
  • Type designation: A series of letters and numbers that indicate the capacitor's type, construction, and materials used.
  • Certification marks: Symbols or logos that indicate compliance with specific safety standards or regulations.

Examples and Interpretation

Let's look at an example code: X7R104K

  • X: Voltage rating of 250 VAC or 300 VDC
  • 7R: Capacitance value of 100,000 pF or 100 nF
  • 104: Capacitance value ( redundant, but sometimes included)
  • K: Tolerance of ±10%

This capacitor has a voltage rating of 250 VAC or 300 VDC, a capacitance value of 100 nF, and a tolerance of ±10%.


Understanding high voltage ceramic capacitor codes is crucial for ensuring the correct selection and use of these components in your designs. By breaking down the code into its components, you can easily decipher the voltage rating, capacitance value, tolerance, and other specifications of the capacitor. Remember to always consult the manufacturer's datasheet and documentation for specific information about the capacitor's performance and limitations.

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