Nickel Powder (MPP) Toroidal Chokes


Both the ECHL and EDHL Series chokes are offered for use in high-frequency DC power-supply applications and also for AC applications which require linearity and temperature stability.  The cores permeability is stable within ±1% over -55 to +85°C temperature range. These Chokes are designed to meet MIL-PRF-27 Grade 5 Class S (130°C) requirements.

This series uses MPP (Molybdenum Permalloy Powder) cores which are the best combination of high flux density, low core loss, and temperature stability.  The toroidal configuration minimizes stray field effects.

For DC filter choke applications, the useful frequency range is up to approximately 1/3 of the self-resonant frequency.


The two small sizes EC15 and EC30 can be mounted either vertically or horizontally. The remaining ED parts are all horizontal for low profile with mounting inserts.  Modified Standard Parts are available.  Examples of options are open coils, special winding for high voltage or higher self-resonant frequency.

Spec Sheet List:
To view a spec sheet, click on the appropriate link below. A page will open in a new window and where you can zoom, print or save the document. After you are finished using the file, simply close the newly opened tab/window.  
ECHL    Rev-B    Spec-Sheet     71.3 KB
EDHL    Rev-B    Spec-Sheet     64.0 KB
EMHL    Rev-A    Spec-Sheet     64.0 KB