In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

The equivalent series resistance (ESR) of a capacitor is essentially the resistance of the internal structure of the capacitor.  This sort of information is given on the datasheet of the capacitor.  Usually Tantalum capacitors have a lower ESR than Aluminum capacitors and you can parallel a smaller Tantalum with a larger Aluminum as I suggested to get a lower ESR.

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