Smd Capacitor Code 104

4 min read Jun 26, 2024
Smd Capacitor Code 104

Understanding SMD Capacitor Code 104

SMD (Surface Mount Device) capacitors are widely used in electronic circuits due to their compact size and high reliability. One common type of SMD capacitor is the 104 capacitor, which is identified by a specific code printed on its body. In this article, we will delve into the meaning and significance of the 104 code on SMD capacitors.

What does the 104 code mean?

The 104 code on an SMD capacitor represents its capacitance value and tolerance. The code is derived from the EIA (Electronic Industries Alliance) standard, which is widely adopted in the electronics industry.

In the case of the 104 code, the first two digits (10) represent the capacitance value in picofarads (pF). The value is calculated by multiplying the digits by 10, so:

10 × 10 = 100 pF

The third digit (4) represents the tolerance of the capacitance value. A tolerance of 4 means that the actual capacitance value can vary by ±10% from the nominal value of 100 pF.

Calculating the Actual Capacitance Value

To calculate the actual capacitance value of a 104 SMD capacitor, you can use the following formula:

Actual Value = Nominal Value × (1 ± Tolerance)


  • Nominal Value = 100 pF
  • Tolerance = ±10%

Actual Value = 100 pF × (1 ± 0.1) Actual Value = 90 pF to 110 pF

This means that the actual capacitance value of a 104 SMD capacitor can range from 90 pF to 110 pF.

** Importance of Capacitor Tolerance**

Capacitor tolerance is critical in electronic circuits, as it affects the overall performance and reliability of the system. A capacitor with a low tolerance (e.g., ±1%) is more precise and stable, while a capacitor with a high tolerance (e.g., ±20%) can introduce variations in the circuit.


In conclusion, the 104 code on an SMD capacitor indicates a capacitance value of 100 pF with a tolerance of ±10%. Understanding the code is essential for selecting the right capacitor for your electronic project and ensuring optimal performance and reliability. By grasping the meaning and significance of the 104 code, you can make informed decisions when designing and building your electronic circuits.

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