Common Mode Coils KEMET Common Mode Coils are available in a wide variety of sizes, specifications, and characteristics. These coils feature proprietary ferrite material and equivalents with three types of cores: toroidal, UU, and square-shaped. The portfolio includes chokes that are AEC-Q200 qualified. KEMET Common Mode Coils have an operating temperature range of -25°C to +150°C, depending on the series. Typical applications include automotive, audio-visual equipment, office automation equipment, industrial equipment, digital appliances, and power supply devices.