Ceramic Y Capacitors

X capacitors effectively absorb symmetrical balanced or differential interference.

Ceramic y capacitors.

Y capacitors are connected in a line bypass between a line phase and a point of zero potential to absorb asymmetrical unbalanced or common mode. In a multilayer configuration they display high capacitance values and various voltage ratings over a wide temperature range. Ceramic capacitors exhibit low parasitics and excellent emi filtering capabilities. Capacitors ceramic capacitors are in stock at digikey.

Generally x capacitors work for across the line applications and y capacitors work for line bypasses or line to ground applications. Ac line rated ceramic disc capacitors class x1 400 vac class y4 125 vac. Subclass x1 x2 and x3 and subclass y1 y2 y3 and y4. Capacitors ship same day.

Because class x and class y capacitors must be connected directly to ac lines line to neutral or line to ground in order for them to perform their emi and rfi filtering functions they must be rated and certified as safety capacitors both class x and class y capacitors have subclasses. Ceramic failure mode also tends toward short circuit whereas metallised paper and film types tend towards open circuit. Kemet s extensive portfolio of capacitors covers 96 of all dielectric options available that find usage in automotive industrial telecommunications defense and consumer electronics. A y capacitor can take the place of an x capacitor in an across the line application only when absolutely necessary though this is highly uneconomical.