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How to see the withstand voltage of tantalum capacitors

elecfans | 05/07/2021

Tantalum capacitor

Tantalum capacitors are products that are small in size and can achieve larger capacitance. They were first developed by Bell Laboratories in 1956. It has excellent performance. Tantalum capacitors have various shapes and are made into small and chip components suitable for surface mounting. Tantalum capacitors are not only used in military communications, aerospace and other fields, but also tantalum capacitors are still widely used in industrial control, film and television equipment, communication instruments and other products.

How to see the withstand voltage of tantalum capacitors

Tantalum capacitors are also marked. Different logos have different meanings. The withstand voltage value is often marked on the product, so what is the expression method for the withstand voltage value of tantalum capacitors?

For example: the tantalum capacitor is marked with 106F, which means: 106 is the capacity of 10uF, F should be 2.5V withstand voltage. The withstand voltage of tantalum capacitors is marked with different letters, as follows: F: 2.5; G: 4; J: 6.3; A: 10; C: 16; D: 20; E: 25; V: 35; T: 50.

In the case of a certain volume, the larger the capacitance value, the smaller the withstand voltage value. Of course, there are certain differences in the way and meaning of different brands on the logo. At present, there are mainly the following brands of tantalum capacitors in the world: AVX, KEMET, VISHAY, NEC, NICHICON.

The actual use voltage of ordinary tantalum is generally 50%, while AVX is above 80%. For example: a 100uf 10v ordinary capacitor, in actual use, the rated voltage cannot exceed 5V, if you use AVX's Polymer material capacitor, then only 100uf 6.3v is needed. However, due to price issues, Polymer is not used much on ordinary electronic products.

AVX's research and developers in Polymer are basically dug from KEMET. As for VISHAY, most of its tantalum capacitors are used in military industry, and its ordinary tantalum capacitors have a relatively small market share. For selection, AVX tantalum batteries mainly include TAJ, TPS, TPM, TCJ, TLJ, THJ, TRJ, TAC, TLC and other series, and TAJ series are commonly used. The TPS series is a low impedance series. The sizes of tantalum capacitors include A, B, C, D, E, V, R, S, T, P, W, X, Y. The withstand voltage of 13 sizes of capacitors refers to the rated DC voltage at 85°C. Tantalum The withstand voltage range of the capacitor is from 2.5V---50v.

This is how the withstand voltage of tantalum capacitors are identified. Through these identification information, the product information can be accurately and clearly determined. Avoid ignoring the identification information, causing the purchased capacitor withstand voltage value to not meet the actual requirements, causing unnecessary trouble.

In short:

Tantalum capacitors have relatively high voltage requirements, and generally require a margin of 50%. If it exceeds its withstand voltage, it will be damaged or even explode.

The capacitance value is calculated as follows: If the mark 107E, where E represents the withstand voltage value of 25V, 107 represents the capacitance value, 10x10 to the 7th power of pF, the unit above pF is nF, uF. Therefore, 107 represents 100uF, 227 means 220uF.

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