The first curve on the left compares the "SP-Cap", conventional tantalum, polymer tantalum and MLCC for ESR and impedance for a 100µF capacitor. The "SP-Cap" falls in between the MLCC and the tantalum capacitors for ESR and impedance. The second curve on the right compares the four capacitor types for capacitance versus frequency. Due to the "SP-Cap" low ESR, planar construction, and shallow depth of the etched/oxidized aluminum foil, the capacitance of the "SP-Cap" is very stable over frequency. The conventional and polymer tantalum capacitors have a drop in capacitance as frequency increases due to the higher ESR and the pellet structure of tantalum capacitors.