E Cores were modeled after standard steel lamination sizes. The most common applications are for chokes or power transformers in SMPS. Because of their simple shape these cores can be produced more economically than more complicated geometries. E Cores do not, however, offer self shielding. Gapping to a specified Al value is available. Metric, DIN and standard lamination sizes are readily available. ETD stands for economic transformer design. Designed for use as switching transformers in SMPS. This core design is economic in that it can achieve maximum throughput power in relation to the weight and volume of the whole transformer assembly. Shielding is somewhat increased in comparison to E Cores. The other advantage is that the center leg is round vs. E Cores which have square legs. This yields a shorter path length which reduces the winding losses by over 10%. EFD stands for economic flat design. EFD Cores are used in power transformer applications where space is limited. Throughput power of a ferrite core transformer increases as the volume of the core increases. Therefore, the transformer is one of the main limitations in a DC to DC converter's size. The EFD design significantly reduces the core height while keeping the same magnetic volume.

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