Control Line Hemp/Tempest Filter

Control Line Hemp/Tempest Filter

This MIL-STD-188-125-1 and MIL-STD-188-125-2 compliant Control Line Filter was designed for use on a ground based program for protection of critical systems from HEMP (high-altitude electromagnetic pulse) conditions.

In addition to meeting the MIL-STD-188-125 requirements the filter also has Tempest insertion loss performance. Although originally designed for the ground based program this filter is now used in a number of different installations requiring HEMP protection.




Case Material:



Electro Tin-Lead

Line Terminations:

¼” Quick Disconnect Terminal Tabs

Load Terminations:

¼” Quick Disconnect Terminal Tabs


2 x 7/16-20UNF-2A Studs (Brass)


1.5 lbs. Maximum


Operating AC Voltage

120 VAC

Operating DC Voltage

177 VDC


0 to 60 Hz

Operating Current

1 Amp


1000 VDC

DC Resistance

1 Ω Maximum

Insertion Loss (MIL-STD-220)

  • Passband: 1.0 dB Max. from 10 to 2.5 kHz.
  • Stopband: 100 dB Min. from 14 kHz to 10 GHz

HEMP Protection (MIL-STD-188-125-1)

  • Input Pulse (60 Ω source)
  • Output Residual (2 Ω load)
  • 2500 amps (150, 000 volts)
  • 0.1 amps maximum (0.2 volts)


Operating Temperature Range

-55° C to +85° C

Storage Temperature Range

-55° C to +105° C

Operating Altitude

< 50,000 feet