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MAGNETICS Ferrite EC, ER, ETD and EER Cores Ferrite EC, ER, ETD and EER Cores

EC, ER, ETD and EER shapes are a cross between E cores and pot cores.  Like E cores, they provide a wide opening on each side.  This gives adequate space for the large size wires required for low output voltage switched mode power supplies.  It also allows for a flow of air which helps keep the assembly cooler.  The center post is round, like that of the pot core.  One of the advantages of the round center post is that the winding has a shorter path length around it (11% shorter) than the wire around a square center post with an equal area.  This reduces the losses of the windings by 11% and enables the core to handle a higher output power.  The round center post also eliminates the sharp bend in the wire that occurs with winding on a square center post.

Special Advantages of MAGNETICS® EC, ER, ETD, EER Core Assemblies
  • wide core selection
  • PCB and surface mount bobbins
  • minimal wire losses
  • heavy wire capability
  • multiple tap capability
  • consistency and uniformity
  • compact packaging on PCB
  • easy mounting
  • easy, low-cost assembly
  • These cores are offered in low-loss materials for high performance transformers and inductors.  They may be provided gapped for power inductors and other high DC bias applications.
Sizes Materials

Each link below will open a PDF file containing dimensional data, magnetic data, diagrams, and mounting hardware (if applicable).  These pages are taken from Section 12 of the MAGNETICS Ferrite Cores Design Manual and Catalog


The link below will open the PDF file of individual pages from Section 3 of the MAGNETICS Ferrite Cores Design Manual and Catalog.

EC Sizes

F J P R W
ETD Sizes
F J P R W
EER Sizes
F J P R W
ER Sizes
F J P R W
Technical Information