The 18121C105K4Z2A is a ceramic capacitor manufactured by Kyocera AVX. It is an X7R type capacitor with a capacitance of 10µF, a rated voltage of 4V, and a tolerance of ±20%. The part is composed of two pieces of dielectric ceramic material which are separated by a layer of silver-plated electrodes, forming a sandwich. It also features a ±30% temperature coefficient, a superior high-frequency performance, and a wide range of operating temperatures. This part is used in a variety of applications such as timers, oscillators, motor control circuits, power supplies, and can also be used as part of noise suppression circuits.