Noise Suppression Capacitor

Function: Reduces EMI/RFI noise in circuits by providing a low-impedance path to ground for high-frequency noise.

Common Types:

• X Capacitors: Connected line-to-line (across phases), suppress differential-mode noise.
• Y Capacitors: Connected line-to-ground, suppress common-mode noise. Higher safety requirements (rated for voltage isolation).

Typical Values:

• X Cap: 0.01µF – 10µF, rated 275VAC or 310VAC
• Y Cap: 1nF – 100nF, rated 250VAC to 500VAC (Y1/Y2)

Applications: Power supplies, motor drives, switch-mode power supplies (SMPS), AC input filtering.

Note: Must meet safety standards (e.g., IEC 60384-14) and use certified components for Y caps due to direct mains connection.