The difference between polymer tantalum capacitors and ordinary tantalum capacitors

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The difference between polymer tantalum capacitors and ordinary tantalum capacitors [Copy link]

Tantalum Capacitor Introduction

The full name of tantalum capacitor is tantalum electrolytic capacitor (also called tantalum capacitor). It is a type of electrolytic capacitor. It uses metal tantalum as the medium. Unlike ordinary electrolytic capacitors, it uses electrolyte. Therefore, it is suitable for working under high temperature. It is a product with small size but large capacitance among capacitors. It has few competitors in power supply filtering, AC bypass and other uses.

advantage:

Tantalum capacitors have almost no inductance, but this also limits their capacity. In addition, since there is no electrolyte inside tantalum capacitors, they are very suitable for working at high temperatures.

Tantalum capacitors are characterized by long life, high temperature resistance, high accuracy, and excellent high-frequency harmonic filtering performance. During the operation of tantalum electrolytic capacitors, they have the ability to automatically repair or isolate the defects in the oxide film, so that the oxide film medium can be reinforced and restore its proper insulation capacity at any time without suffering continuous cumulative damage. This unique self-healing performance ensures its advantages of long life and reliability.

Tantalum electrolytic capacitors have very high working electric field strength and are larger than capacitors of the same type, thus ensuring their miniaturization.

Disadvantages of Tantalum Capacitors:

The capacity is smaller and the price is more expensive than aluminum capacitors, and the voltage and current resistance are weaker. It is used in places with large capacity filtering, such as near the CPU slot. Tantalum capacitors are often used in conjunction with ceramic capacitors and electrolytic capacitors or in places where the voltage and current are not large.

Introduction to polymer tantalum capacitors

Polymer capacitors are chip-type laminated aluminum electrolytic capacitors that use high-conductivity polymer materials as cathodes. They have superior electrical properties that surpass existing liquid chip aluminum electrolytic capacitors and solid chip tantalum electrolytic capacitors. Polymer capacitors do not need to be used at a reduced voltage within the rated voltage range.

It has extremely low equivalent series resistance (ESR), strong ability to reduce ripple voltage, and allows larger ripple current to pass. At high frequencies, the impedance curve of polymer chip laminated aluminum electrolytic capacitors presents characteristics close to ideal capacitors. When the frequency changes, the capacitance is very stable. This type of capacitor is mainly used in motherboard (laptop computers, flat panel displays, digital switches) bypass decoupling/energy storage filter capacitors, switching power supplies, DC/DC converters, high-frequency noise suppression circuits, and portable electronic devices.

The difference between polymer tantalum capacitors and ordinary tantalum capacitors

Comparison table of polymer tantalum capacitors and standard tantalum capacitors

1. Can be used at 80%~90% of rated voltage

2. Lower failure rate

3. Non-combustion failure mode

4. Ultra-low equivalent series resistance (ESR)

5. Polymer cathode technology has high frequency response effect (100uF capacitance)

6. Application and cost comparison (with lower cost)

Number of uses under the same circuit conditions

7. Cost comparison