EMIS Launches SMF913 and TMF913 HEMP Power Line Filters

Global EMC solutions provider EMIS has introduced the SMF913 (single-phase) and TMF913 (three-phase) Common Mode HEMP Power Line Filters. Designed for AC and DC facility power applications ranging from 6 A to 3000 A, these filters protect sensitive electrical and electronic equipment against High-Altitude Electromagnetic Pulse (HEMP), conducted Electromagnetic Interference (EMI/RFI), and nuclear-induced disturbances. The filters feature an integrated 80 kA peak surge-current protection (8/20μs) to safeguard against lightning-induced surges and power switching transients. Incorporating built-in discharge resistors to safely dissipate stored capacitor energy, the units improve operator safety across command and control centers, EMP shielded mobile shelters, data centers, combat tracked vehicles, MIL-grade panels, radar power supplies, and telecommunications infrastructure.

The HEMP filters are designed and tested in accordance with MIL-STD-188-125-1/2 and MIL-PRF-15733J standards. They are engineered to withstand specified E1 Short Pulse (limiting residual current to ≤10 A) and E2 Intermediate Pulse current injection levels under common-mode and line-to-ground conditions without sustaining damage. Standard performance models deliver 100 dB insertion loss from 30 MHz to 18 GHz, followed by 90 dB attenuation up to 40 GHz, while extended-performance variants provide a full 100 dB of attenuation from 14 kHz to 40 GHz. Drawing on over 40 years of manufacturing experience, EMIS supports these components globally alongside a pre-compliance lab, a dedicated consulting team, and a portfolio of over 2,500 safety-certified part numbers across eight industry segments.

Additional Context
This section provides technological and market background not explicitly detailed in the original release.

High-Altitude Electromagnetic Pulses (HEMP), typically generated by nuclear detonations in the upper atmosphere, can induce massive, instantaneous voltage and current surges in power and communication lines, instantly destroying unprotected solid-state electronics over vast geographical areas. Protecting critical national infrastructure—such as defense grids, utility networks, and hyperscale data centers—requires specialized shielding and high-performance filtering at every power entry point. The stringent MIL-STD-188-125 standard mandates that these protective devices react within nanoseconds to clamp the E1 "fast pulse" component of a HEMP, ensuring that the residual energy allowed into the protected facility remains well below the damage threshold of modern silicon-based microprocessors and communication arrays.

Edited by Lekshman Ramdas, Induportals editor – adapted by AI.

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