EMI Filters

All the Benefits of a Bulky Filtered Connector in a Slim, Cost-Effective Insert

Conductive silicone rubber of EESeal® fits over connector pins like a glove. Each pin in your connector is like a finger in the glove. We can treat each one uniquely with capacitors, resistors, MOVs, or other electronics to meet your project requirements.

Rapid prototyping and split-second installation tackle EMI/RFI problems pronto—all in an insert weighing under one gram.

Solve EMI/EMC problems in all connector types:

  • D-Sub
  • Circular
  • MDM
  • Micro-D
  • MIL-C-38999
  • MIL-C-26482
  • MIL-C-5015
  • MIL-C-83723
  • Lemo
  • …or any custom design, too!

Meet or exceed requirements of common specs and standards:

  • MIL-STD-461
  • MIL-STD-1344 shock, vibration, salt spray, durability, fluid immersion, porosity
  • RTCA/DO-160 thermal cycling, humidity
  • MIL-STD-5400 temperature/altitude
  • NASA outgassing

Under Pressure to Correct a Failed EMI Compliance Test?

Learn how filter inserts can help you pass your next EMC test.

Available in 3 Varieties


Fits over connector pins like a glove


For high-frequency mitigation

Filter Connector Solutions

Get the best behind-panel filter performance in a standard connector package

Before & After: See How an EMI Filter Insert Fixes
MIL-STD-461 Radiated Emissions Problems

During testing, this connector demonstrated high EMI levels, with several surges above the spec level.
An EESeal® corrected the issue instantly, earning a passing grade.

EESeal EMI Filter Fixes MIL-STD-461 Radiated Emissions Problems; Graph showing effectiveness of EESeal

Typical EESeal® Attenuation

Single Capacitor – Pin to Shell

Typical attenuation of a range of capacitors used in an EESeal.

Other capacitor values are also available. This includes Commercial grade, HiRel, Space, etc.

In this example the target frequencies were from 50-200MHz with a peak outage at 80MHz.  Due to the differences in inductance between an EESeal and the EESeal+, a different capacitor value must be used. As you can see, the EESeal+ offers ~10dB of additional attenuation up and down the curve over the standard EESeal for this application.

Using the same capacitor in any EMI filter does not always give you the same performance. The attenuation using a discrete 4pF capacitor in an EESeal vs. the EESeal+ are very different. Integral capacitors can be used in the EESeal+ which have virtually zero inductance allowing for noise mitigation in the 10-100GHz range.

Request Your FREE Generic or Custom EESeal or EESeal+ Sample