Three-Terminal Filter

A three-terminal filter (also known as a three-terminal capacitor or EMI filter) is commonly used for noise suppression in power lines.

• Pins: Input, Output, Ground
• Function: Filters high-frequency noise from DC/AC power lines
• Typical Use: Power supply inputs, IC power pins
• Advantage: Better high-frequency performance than two-terminal capacitors due to reduced lead inductance

Circuit Symbol: Often resembles a capacitor with three leads — one input, one output, and one grounded case.

Package: Radial or surface mount (e.g., SMD three-terminal filters)