EMI Shielding Suppliers

EMI shielding uses conductive materials to block electromagnetic interference between electronic circuits. It prevents radiated emissions from escaping a device and protects sensitive components from external interference. Shielding is required to meet regulatory standards like FCC Part 15, CISPR 32, and automotive CISPR 25.

Gaskets seal gaps in enclosures to prevent EMI leakage at joints and seams. Absorbers reduce internal reflections and cavity resonance inside enclosures. Board-level shields (shield cans) isolate specific circuits on a PCB. Your choice depends on whether the interference source is at the enclosure level or the component level.

Common materials include nickel-silver, tin-plated steel, and copper alloys for board-level shields; conductive silicone and metal-filled elastomers for gaskets; ferrite and carbon-loaded foams for absorbers; and copper, aluminum, or nickel for tapes and coatings. Material selection depends on frequency range, shielding effectiveness required, and environmental conditions.

Shielding effectiveness is the ratio of electromagnetic field strength without a shield to the field strength with a shield, measured in decibels (dB). A 20 dB shield blocks 99% of energy; 40 dB blocks 99.99%. SE is measured per IEEE 299 for enclosures or per specific methods like coaxial fixture tests for gaskets and materials.

Look for suppliers with relevant certifications (IATF 16949 for automotive, ISO 9001 for general quality), established manufacturing capabilities, and the ability to provide test data and certificates of conformance. Working with direct manufacturers rather than brokers ensures traceability and reduces counterfeit risk.