IEC 63093-5:2025 PDF

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 5: EP-cores and associated parts for use in inductors and transformers

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Title (English):

IEC 63093-5:2025

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 5: EP-cores and associated parts for use in inductors and transformers

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: December 15, 2025
Edition:: IEC IS 63093 edition 2 version 1
ICS:: 29.100.10

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Description (English):

IEC 63093-5:2025 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EP-cores made of ferrite, the essential dimensions of coil formers to be used with them and the locations of their terminal pins on a 2,50 mm printed wiring grid in relation to the base outlines of the cores and the effective parameter values to be used in calculations involving them. It also gives guidelines on allowable limits of surface irregularities applicable to EP-cores. The specifications contained in this document are useful in negotiations between ferrite core suppliers and users about surface irregularities. The general considerations upon which the design of this range of cores is based are as given in Annex A. This edition includes the following significant technical changes with respect to the previous edition: a) revision of Table 2 according to IEC 60205:2016.

Technical details

Technical committee: TC 51 - Magnetic components, ferrite and magnetic powder materials
SKU: IEC 63093-5:2025

Abstract

Overview

IEC 63093-5:2025 - "Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 5: EP‑cores and associated parts for use in inductors and transformers" defines mechanical and visual requirements for a preferred range of EP‑cores (sizes EP5 to EP30) made of ferrite. The standard specifies the principal dimensions that ensure mechanical interchangeability, essential coil‑former dimensions, terminal‑pin locations on a 2.50 mm printed wiring grid, and the effective magnetic parameters to be used in calculations. It also gives illustrated guidance and numerical limits for allowable surface irregularities (chips, cracks, flash, pull‑outs, crystallites, pores) useful in supplier–user negotiations.

Key topics and technical requirements

Mechanical interchangeability: Principal dimensions and tolerances for EP‑core sizes (EP5…EP30) to ensure assemblies and wound coil formers fit across suppliers.
Coil former dimensions: Essential limits for formers that mate with EP‑cores (see main dimensions and tables for e, f, d, s, etc.).
Pin locations and base outlines: Terminal pin coordinates referenced to a 2.50 mm PCB grid for both SMD and PTH versions, with base outlines relative to mounting direction.
Effective parameters: Effective magnetic parameters and A‑values are tabulated (Table 2) and calculated per IEC 60205; the standard instructs use of K(nom.) for those calculations.
Surface irregularities: Definitions, examples (figures), and numerical acceptance criteria:
- Minimum visually distinguishable area: 0.5 mm²
- For chips on mating surfaces, cumulative chip area must be **

Related standards

Mentioned in the description and other IEC standards

Overview

Key topics and technical requirements

Mechanical interchangeability: Principal dimensions and tolerances for EP‑core sizes (EP5…EP30) to ensure assemblies and wound coil formers fit across suppliers.
Coil former dimensions: Essential limits for formers that mate with EP‑cores (see main dimensions and tables for e, f, d, s, etc.).
Pin locations and base outlines: Terminal pin coordinates referenced to a 2.50 mm PCB grid for both SMD and PTH versions, with base outlines relative to mounting direction.
Effective parameters: Effective magnetic parameters and A‑values are tabulated (Table 2) and calculated per IEC 60205; the standard instructs use of K(nom.) for those calculations.
Surface irregularities: Definitions, examples (figures), and numerical acceptance criteria:
- Minimum visually distinguishable area: 0.5 mm²
- For chips on mating surfaces, cumulative chip area must be **

IEC 63093-5:2025 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Calculation of the effective parameters of magnetic piece parts

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