Lambda / TDK / EMI LT-864

The Lambda/TDK EMI LT-864 is an electromagnetic interference filter that mitigates conducted noise and disturbances in electronic systems. Using passive L-C circuits with inductors and capacitors, it blocks high-frequency noise while maintaining signal integrity across sensitive equipment. The filter ensures compliance with FCC Class A conducted EMI standards and addresses critical EMC immunity requirements, protecting systems against electrical fast transients and surge events per EN 61000-4-4 and EN 61000-4-5.

Technical Specifications

• Product Type: EMI Filter


• Manufacturer: Lambda / TDK


• Model: LT-864


• Input Voltage: 187–265 VAC (3-phase, 4-wire)


• Maximum Phase Imbalance: ±10%


• Frequency: 47–63 Hz


• EMI Conformance: FCC 20780 Class A (conducted)


• Immunity Test Range: 500V–4,000V peak

Key Features

• Passive inductor-capacitor topology diverts high-frequency noise while passing desired low-frequency currents


• Addresses EN 61000-4-4 electrical fast transient/burst immunity


• Addresses EN 61000-4-5 surge immunity with low-voltage transient protection (several mJ)


• Heavy-duty barrier strip AC input and grounding connections


• Fan-cooled design with forced-air circulation and long-life cooling fans


• Performance criteria (A–D) selectable for different operating environments

Typical Applications The LT-864 provides EMI filtration for industrial power distribution, laboratory instrumentation, and sensitive control electronics requiring FCC Class A compliance and multi-standard EMC certification.

Compatibility & Integration The LT-864 integrates with TDK-Lambda LT-series power supplies including LT-800, LT-820, LT-860, LT-880, and LT-890 models. These supplies feature constant voltage/constant current operation with rear-mounted DC output bus bars and comprehensive overvoltage protection.