EMI

Electromagnetic interference, EMI, is radiated or conducted energy that adversely affects circuit performance, thus disrupting a device's Electromagnetic compatibility, EMC. Many types of electronic circuits radiate or are susceptible to EMI and must be shielded to ensure proper performance. Establishing basic electromagnetic compatibility in any electronic device generally requires two distinct approaches. The first approach is to reduce EMI generated from internal sources.The second is to shield the device from the Interfering Energy.

Ferrite components control EMI by acting as a lossy Impedance devices. It provides a significant series impedance to the EMI, thus absorbing the energy. Ferrite components are designed and manufactured to satisfy the user requirements. Best used are NiZn ferrites which has the highest impedance in a wide range of frequencies.

The common equation relating to the Impedance, Inductance and Resistance of inductors and the frequency behavior is



ACME manufactures a variety of materials and core shapes for EMI suppressions. A few examples are:
1) Leaded beads
2) Toroids for Common & Differential mode chokes
3) Multi-aperture cores
4) Cylindrical cores for round cables
5) Various types of cable cores
6) Flat cable cores for ribbon cables

Custom made shapes are available upon demand.

The D28, D27, D30, D34, D35 materials of ACME are used as EMI suppressors at low frequencies. ACME's low permeability materials like H2, H2A, H2C, H3, H3A, H3C, etc are suitable for high frequency chokes. H5 and H5B are widely used as automotive choke ferrite.