Smd Ceramic Capacitor Codes

3 min read Jun 26, 2024
Smd Ceramic Capacitor Codes

SMD Ceramic Capacitor Codes: A Comprehensive Guide

What are SMD Ceramic Capacitors?

SMD (Surface Mount Device) ceramic capacitors are a type of electronic component used to store energy in the form of an electric field. They are widely used in electronic circuits due to their compact size, low cost, and reliability. Ceramic capacitors are made from ceramic materials with metal electrodes deposited on them.

Understanding SMD Ceramic Capacitor Codes

SMD ceramic capacitors have a unique coding system that indicates their characteristics, such as capacitance, tolerance, and voltage rating. The code consists of a combination of letters and numbers that are printed on the capacitor's body.

Capacitance Code

The capacitance code is usually a three-digit number that represents the capacitance value in picofarads (pF). The first two digits represent the significant figures, and the third digit represents the multiplier.

  • Example: 104 = 10 x 10^4 = 100,000 pF = 100 nF

Tolerance Code

The tolerance code is a single letter that indicates the percentage of deviation from the nominal capacitance value.

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

Voltage Rating Code

The voltage rating code is a single letter that indicates the maximum voltage rating of the capacitor.

  • A: 100 V
  • B: 200 V
  • C: 400 V
  • D: 630 V
  • E: 1,000 V

Package Size Code

The package size code is a two-digit number that indicates the length and width of the capacitor in millimeters.

  • Example: 0603 = 6 mm x 3 mm

Example of a Complete SMD Ceramic Capacitor Code


  • 105: Capacitance value = 10 x 10^5 = 1,000,000 pF = 1,000 nF
  • K: Tolerance = ±10%
  • 630: Voltage rating = 630 V
  • A: Not used in this example

In this example, the capacitor has a capacitance value of 1,000 nF, a tolerance of ±10%, and a voltage rating of 630 V.


SMD ceramic capacitor codes can seem complex at first, but by understanding the individual components of the code, you can easily decode the characteristics of a capacitor. By recognizing these codes, you can ensure that you use the correct capacitor in your electronic circuits.

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