PCK Ultra-Low ESR Capacitors Nichicon PCK Ultra-Low ESR Capacitors are conductive polymer capacitors that offer low ESR (≤ to specified value at 100kHz, 20°C). Nichicon PCK capacitors are aluminum solid electrolytic chip capacitors for SMD with lead-free reflow at 260°C peak correspondence. These capacitors feature high ripple current, high capacitance (220µF to 2200µF) low impedance, an anti-solvent feature, and are ideal for high-frequency applications.