How To Read Ceramic Capacitor

4 min read Jun 26, 2024
How To Read Ceramic Capacitor

How to Read Ceramic Capacitor Values and Codes

Ceramic capacitors are widely used in electronic circuits due to their small size, low cost, and reliability. However, reading their values and codes can be challenging, especially for beginners. In this article, we will guide you on how to read ceramic capacitor values and codes.

Understanding Ceramic Capacitor Markings

Ceramic capacitors have various markings that indicate their values, tolerance, voltage rating, and other characteristics. The markings can be in the form of numbers, letters, or symbols. Here are some common markings found on ceramic capacitors:

Value Markings

  • Numerical Values: Capacitance values are usually marked in picofarads (pF). For example, "104" represents a 100nF (0.1μF) capacitor.
  • Multiplier Codes: A multiplier code may be used to indicate the capacitance value. For example, "104K" represents a 10nF (0.01μF) capacitor, where "K" is the multiplier code for 1000.

Tolerance Markings

  • Percentage Tolerance: A percentage tolerance marking indicates the allowed deviation from the nominal value. For example, "±10%" means the capacitor's value can be 10% higher or lower than the nominal value.
  • Letter Codes: Letter codes are used to indicate the tolerance. For example, "F" represents ±1%, "G" represents ±2%, and "J" represents ±5%.

Voltage Rating Markings

  • Voltage Rating: The voltage rating is usually marked on the capacitor. For example, "50V" represents a capacitor rated for 50 volts.
  • Voltage Code: A voltage code may be used to indicate the voltage rating. For example, "X7R" represents a capacitor with a voltage rating of 50V.

Other Markings

  • Temperature Coefficient: The temperature coefficient marking indicates how the capacitor's value changes with temperature. For example, "X7R" represents a capacitor with a temperature coefficient of ±15%.
  • Certification Markings: Certification markings, such as "RoHS" or "REACH", indicate compliance with environmental regulations.

How to Read Ceramic Capacitor Codes

Now that you understand the different markings on ceramic capacitors, let's learn how to read their codes.

Example 1: 104K 50V X7R

  • Value: 10nF (0.01μF)
  • Multiplier Code: K (1000)
  • Voltage Rating: 50V
  • Temperature Coefficient: X7R (±15%)

**Example 2: 222J 25V"

  • Value: 2200pF
  • Tolerance: ±5% (J)
  • Voltage Rating: 25V


Reading ceramic capacitor values and codes requires attention to detail and an understanding of the various markings. By following the guidelines outlined in this article, you can easily read ceramic capacitor codes and ensure the correct selection of components for your electronic projects.

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