Smd Electrolytic Capacitor Size Code

5 min read Jun 26, 2024
Smd Electrolytic Capacitor Size Code

SMD Electrolytic Capacitor Size Code: A Comprehensive Guide

Introduction

Electrolytic capacitors are widely used in electronic circuits to filter, regulate, and store electrical energy. In surface-mount device (SMD) technology, electrolytic capacitors come in various sizes and shapes to accommodate different applications. Understanding the size code of SMD electrolytic capacitors is crucial to ensure correct component selection and PCB design. In this article, we will delve into the world of SMD electrolytic capacitor size codes, exploring their meaning, dimensions, and applications.

What is an SMD Electrolytic Capacitor Size Code?

An SMD electrolytic capacitor size code is a series of letters and numbers that identify the physical dimensions, capacitance, and voltage ratings of the component. The code is usually printed on the capacitor body and consists of a combination of the following elements:

  • Case size: Represented by a series of letters (e.g., A, B, C, D, E) that indicate the capacitor's length, width, and height.
  • Capacitance: Expressed in picofarads (pF) or microfarads (μF) and represented by a numerical value.
  • Voltage rating: Represented by a numerical value indicating the maximum operating voltage.

Common SMD Electrolytic Capacitor Size Codes

Here are some common SMD electrolytic capacitor size codes and their corresponding dimensions:

A Case (Small)

  • Dimensions: 3.5 x 1.6 x 1.6 mm
  • Capacitance: 1 μF to 100 μF
  • Voltage rating: 2.5 V to 50 V

B Case (Medium)

  • Dimensions: 4.5 x 2.0 x 2.0 mm
  • Capacitance: 10 μF to 470 μF
  • Voltage rating: 2.5 V to 100 V

C Case (Large)

  • Dimensions: 5.5 x 2.5 x 2.5 mm
  • Capacitance: 100 μF to 2200 μF
  • Voltage rating: 2.5 V to 200 V

D Case (Extra-Large)

  • Dimensions: 7.5 x 3.5 x 3.5 mm
  • Capacitance: 220 μF to 4700 μF
  • Voltage rating: 2.5 V to 250 V

E Case (Special)

  • Dimensions: Varying sizes
  • Capacitance: Varying values
  • Voltage rating: Varying values

How to Read an SMD Electrolytic Capacitor Size Code

When reading an SMD electrolytic capacitor size code, follow these steps:

  1. Identify the case size: Look for the letter(s) indicating the case size (A, B, C, D, or E).
  2. Determine the capacitance: Read the numerical value indicating the capacitance in picofarads (pF) or microfarads (μF).
  3. Check the voltage rating: Identify the numerical value indicating the maximum operating voltage.

Conclusion

Understanding SMD electrolytic capacitor size codes is essential for selecting the correct component for your electronic design. By recognizing the case size, capacitance, and voltage rating, you can ensure that your circuit operates efficiently and reliably. Remember to consult the datasheet or manufacturer's documentation for specific information on the capacitor you are using.

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