The 500R18W225KV4E Multilayer Ceramic Capacitors MLCC - SMD/SMT LOW ESR 1206,2.2uF,+/-10%,50V is a low-profile, surface-mount capacitor manufactured by Johanson. It features a high relative dielectric constant, a small size (in this case 1206), and a low equivalent series resistance (ESR). It is class II dielectric, and rated to operate at temperatures between -55°C and +125°C. Its rated voltage is a maximum of 50V, and its capacitance is 2.2uF with a +/- 10% tolerance.