Tantalum vs Tanceram?

30 June 2004 Passive Components

Historically, Tantalum capacitors have been used for smoothing and decoupling etc. For high frequency applications, the Tanceram chip capacitor is an excellent substitute for a Tantalum capacitor.

Compared to a Tantalum, a Tanceram chip capacitor has a low ESR and low ESL at high frequencies. As a result, selecting a Tanceram capacitor with ½ to 1/10th the capacitance of a Tantalum will produce an impedance that is more than an order of magnitude lower than the Tantalum capacitor over the same high frequency range.

A typical 4,7 µF Tanceram chip capacitor has low impedance from 100 kHz to 70 MHz. The self-resonant frequency is approximately 3 MHz, which is a remarkably low ESL of 600 pH. Also, the lower impedance produces less heat in power conversion applications.

Often, simply substituting a Tanceram chip capacitor to replace a Tantalum capacitor will reduce the circuit size and cost while providing superior performance. A comparison/substitution chart can be e-mailed by TempeTech. It was developed based on the principles discussed above.

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