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What does the mark on the body of Sunlord’s tantalum capacitor stand for?

The mark on the body of Sunlord’s tantalum capacitors shows:
1) The case of tantalum capacitor;
2) The positive and negative of tantalum capacitor
3) The rated voltage of tantalum capacitor
4) The nominal capacitance of the tantalum capacitor

How to select tantalum capacitors?

The following items should be noted when selecting tantalum capacitors:
1) The working environment of tantalum capacitor should be appropriate, for example, operating temperature range, relative humidity, acidity or alkali requirement should be met. Please refer to SPEC for details.
2) Tantalum capacitor is a kind of electrolytic capacitors and has positive and negative ends which should be identified and placed correctly when using.
3) The first step is to choose Rated Voltage. Generally, the steady operating voltage should be below two thirds of Rated Voltage. For example, if the steady operating voltage is 5V, then the rated voltage of tantalum capacitor should be more than 5/(2/3)=7.5V. If in power supply circuit or low impedance circuit, the steady operation voltage should decrease to one third of Rated Voltage. When the operating temperature is beyond 85℃, the steady operation voltage should decrease further. Please refer to SPEC for details.
4) The second step is to choose capacitance. The capacitor with larger capacitance shows better filtering effect and higher surge current capacity, but affects signal response in high frequency signal. It’s better to choose large capacitance for power lines and relatively low capacitance for high frequency lines.
5) If large ripple current presents, please select tantalum capacitor with small ESR or large case.

Is yellow tantalum capacitor better than the black one?

Actually yellow tantalum capacitor and black ones have the same structure and their main material is almost the same. The difference between them is the encapsulation resin because different manufacturers have their own marking technology and they select resin with suitable color to get obvious mark on the body. Manufacturers in USA or Europe produce yellow tantalum capacitors and Manufacturers in China and Japan produce black ones.

Now, the performances of Chinese tantalum capacitors have reached the world’s leading level. However, there were some inferior goods circulating in the markets at shortage period. Unfortunately, these goods with poor quality were black which makes people lose confidence in black tantalum capacitors. We are sure no matter which color tantalum capacitor is, you will get good quality products from reliable manufacturers.

Would MLCC completely replace tantalum capacitors?

The answer is no. MLCC has a lot of merits, i.e., low Rac, high surge current withstanding capability, no polarity, which make it dominate the markets of high frequency circuit application. With the continuous technology improvement, large capacitance MLCC was mass produced successfully to seize tantalum capacitors’ markets. However, it doesn’t mean that MLCC will completely replace tantalum capacitors as MLCC is not the best choice especially for low frequency circuits.

Firstly, MLCC has a bad temperature characteristic which results in non-use singly in the circuits with precise temperature requirement unless adding extra temperature compensation module. 

Secondly, MLCC’s failure rate is ten times higher than that of tantalum capacitors after the life test at 125℃ and with the load of Rated Voltage.

Lastly, MLCC’s main ingredient is barium titanate with an obvious feature of piezoelectric effect which means that inevitable noise will vocalize because of speaker effect by piezoelectric characteristic and multilayer structure when current within audio frequency range flows to MLCC. In addition, MLCC with larger size or more multiple layers easily generates cracks due to external stress, for example, soldering, PCB distortion. These cracks may hide in the internal body and can’t be found easily at the beginning. As operation goes, the crack will deteriorate to cause MLCC fail due to short.

What is the main difference between Sunlord’s TC211 series and TC212 series?

Sunlord’s tantalum capacitors have two series: TC211 and TC212. The main difference between them is ESR. TC212 series has lower ESR than TC211 series, so it can withstand higher surge current.

What are the main performance parameters of tantalum capacitor?

The main electrical parameters of tantalum capacitor are Rated Voltage, Nominal Capacitance, Equivalent Series Resistance (ESR), Leakage Current and Dissipation Factor.

Rated Voltage is the maximum continuous and steady DC voltage of the capacitor working at 85℃ or below.
Nominal Capacitance is nominal rated capacitance of tantalum capacitor and is measured under the condition of 25℃, 120Hz and 1V. Nominal Capacitance will decrease with the increase of frequency and will increase with temperature.

ESR is a total resistive loss of tantalum capacitor, including the internal conduct resistance, the contact resistance, the viscous force of dielectric and the defects caused by bypass channels. The main cause of ESR is the resistance of tantalum capacitor’s cathode material. ESR will decrease with the increase of frequency. ESR dictates the capability of the

capacitor to withstand surge current. By improving cathode material, MnO2, Sunlord’s TC211/TC212 series tantalum capacitors have reached the world’s leading level on ESR.

Leakage Current is affected by applied voltage, duration time and ambient temperature. It is measured under the condition of Rated Voltage. Leakage Current will increase with temperature and applied voltage.
Dissipation Factor stands for the energy loss of tantalum capacitor. It is defined as the ratio of dissipation energy to stored energy. Dissipation Factor is related with frequency and temperature.