Abstract
IEC 63093-9:2026 specifies the shapes and dimensions of ferrite cores for inductive components (transformers and chokes), designed to employ coils that are made of multi-layer boards, or coils that are part of the motherboard, or flat conductor coils that are helically wound. This part also gives the effective parameter values used in magnetic calculations for such planar cores. In addition, this document gives guidelines on allowable limits of surface irregularities applicable for planar cores. This document is considered as a sectional specification useful in the negotiation between ferrite core suppliers and users about surface irregularities. The general consideration upon which the design of this range of cores is based is given in Annex A.
This edition includes the following significant technical changes with respect to the previous edition:
a) correction of some numbers in Table 2;
b) amendment of Table 6 following IEC 60205.
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