Smd Tantalum Capacitor Marking Code

6 min read Jun 26, 2024
Smd Tantalum Capacitor Marking Code

Understanding SMD Tantalum Capacitor Marking Code

Introduction

Tantalum capacitors are widely used in electronic circuits due to their high capacitance, low equivalent series resistance (ESR), and long-term reliability. Surface-mount device (SMD) tantalum capacitors are particularly popular in modern electronic designs. However, deciphering the marking codes on these components can be challenging. In this article, we will delve into the world of SMD tantalum capacitor marking codes and provide a comprehensive guide to understanding them.

Marking Code Structure

The marking code on an SMD tantalum capacitor typically consists of a combination of letters and numbers. The code can be broken down into several parts, each providing specific information about the component.

  • Manufacturers' Code: The first part of the code usually indicates the manufacturer's identity.
  • Capacitance Value: The capacitance value is represented by a combination of digits and letters.
  • Voltage Rating: The voltage rating is indicated by a single letter or a combination of letters.
  • Tolerance: The tolerance of the capacitance value is represented by a single letter.
  • Package Size and Style: The package size and style are indicated by a single letter or a combination of letters.

Capacitance Value Codes

The capacitance value code is usually a combination of digits and letters. Here are some common capacitance value codes:

  • Digit-Based Codes: The capacitance value is represented by a three-digit code, where the first two digits represent the value in picofarads (pF) and the third digit represents the multiplier (e.g., 104 = 100,000 pF = 100 nF).
  • Letter-Based Codes: Some manufacturers use a letter-based code, where each letter corresponds to a specific capacitance value (e.g., "D" = 2.2 nF, "E" = 4.7 nF).

Voltage Rating Codes

The voltage rating code is typically a single letter or a combination of letters. Here are some common voltage rating codes:

  • Single-Letter Codes: A single letter represents the voltage rating, such as "X" for 10 V, "Y" for 16 V, and "Z" for 20 V.
  • Dual-Letter Codes: Some manufacturers use a dual-letter code, where the first letter represents the voltage rating and the second letter represents the tolerance (e.g., "X5" = 10 V with 5% tolerance).

Tolerance Codes

The tolerance code is usually a single letter. Here are some common tolerance codes:

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

Package Size and Style Codes

The package size and style code is typically a single letter or a combination of letters. Here are some common package size and style codes:

  • A: 0603 package size
  • B: 0805 package size
  • C: 1206 package size
  • D: 1210 package size
  • R: Radial lead package style
  • S: SMD package style

Example Marking Code

Let's consider an example marking code: "KEMET T350A475M006AS".

  • Manufacturers' Code: KEMET
  • Capacitance Value: 4.7 µF (T350 = 4.7 µF)
  • Voltage Rating: 6.3 V (A = 6.3 V)
  • Tolerance: ±20% (M = ±20% tolerance)
  • Package Size and Style: 0603 package size (A = 0603)

By deciphering the marking code, we can determine that the component is a 4.7 µF, 6.3 V, ±20% tolerance SMD tantalum capacitor with a 0603 package size.

Conclusion

Understanding SMD tantalum capacitor marking codes is essential for designing and building electronic circuits. By breaking down the code into its constituent parts and consulting the manufacturer's documentation, engineers and technicians can easily identify the characteristics of these components. Remember, accurate component selection is crucial for ensuring the reliability and performance of electronic systems.

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