Smd Tantalum Capacitor Case Sizes

5 min read Jun 26, 2024
Smd Tantalum Capacitor Case Sizes

SMD Tantalum Capacitor Case Sizes: A Comprehensive Guide


Tantalum capacitors are widely used in electronic circuits due to their high reliability, long lifespan, and high capacitance density. Surface-Mount Device (SMD) tantalum capacitors are a popular choice for modern electronic designs, offering a compact and efficient solution for meeting capacitive requirements. One of the critical aspects of SMD tantalum capacitors is their case size, which affects their performance, reliability, and overall cost. In this article, we will explore the different SMD tantalum capacitor case sizes, their characteristics, and applications.

Case Size Classification

SMD tantalum capacitors come in various case sizes, which are classified into three main categories: A, B, and C. Each category has its own set of dimensions, and they are used for different applications.

A Case Size (Small)

  • Dimensions: 1.6 mm x 0.8 mm x 0.8 mm (L x W x H)
  • Capacitance range: 100 nF to 10 µF
  • Voltage range: 2.5 V to 50 V
  • Features:
    • Compact size, ideal for high-density designs
    • Low equivalent series resistance (ESR)
    • Suitable for decoupling, filtering, and audio applications

B Case Size (Medium)

  • Dimensions: 2.2 mm x 1.3 mm x 1.3 mm (L x W x H)
  • Capacitance range: 100 nF to 47 µF
  • Voltage range: 2.5 V to 100 V
  • Features:
    • Balanced size and capacitance offering
    • Wide voltage range
    • Used in power supplies, audio equipment, and automotive systems

C Case Size (Large)

  • Dimensions: 3.2 mm x 1.6 mm x 1.6 mm (L x W x H)
  • Capacitance range: 100 nF to 100 µF
  • Voltage range: 2.5 V to 200 V
  • Features:
    • Highest capacitance density among all cases
    • Suitable for high-energy storage and filtering applications
    • Used in power supplies, motor control units, and renewable energy systems

Case Size Selection Considerations

When selecting an SMD tantalum capacitor, the case size is a critical factor to consider. Here are some key considerations:

  • Component density: Higher component density requires smaller case sizes, while larger case sizes provide more capacitance and voltage handling capabilities.
  • Capacitance requirements: The required capacitance value will influence the case size selection. Larger case sizes offer higher capacitance values.
  • Voltage rating: The voltage rating of the capacitor must match the operating voltage of the circuit. Larger case sizes often have higher voltage ratings.
  • Reliability and durability: Larger case sizes generally provide better reliability and durability due to their larger surface area and heat dissipation capabilities.


SMD tantalum capacitor case sizes play a crucial role in determining their performance, reliability, and applicability. By understanding the different case sizes, their characteristics, and applications, designers can make informed decisions when selecting the right capacitor for their specific requirements. Whether it's a compact A case size for high-density designs or a larger C case size for high-energy storage applications, the right case size can ensure the optimal performance and reliability of the electronic circuit.

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