IEC 61333 Ed. 2.0 b:2019

Current Revision

Marking on ferrite cores

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IEC 61333 Ed. 2.0 b:2019

Name: IEC 61333 Ed. 2.0 b:2019 – Marking on ferrite cores
Brand: International Electrotechnical Commission
SKU: IEC 61333 Ed. 2.0 b:2019
Price: 50.82 USD
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Marking on ferrite cores

PUBLISH DATE 2019

PAGES 22

Marking on ferrite cores involves several critical considerations to ensure the integrity and performance of the cores.

Firstly, the marking must not influence the magnetic properties of the ferrite material. Therefore, methods used are usually non-invasive and do not involve high temperatures or abrasive techniques that could alter the core's characteristics.

Common marking techniques include:

Ink or paint markings, which are applied carefully to avoid chemical reactions with the ferrite.
Laser marking, which provides precise and permanent identification without physical contact.
Embossing or stamping in cases where slight surface deformation is acceptable.

Each marking method is selected based on the application requirements and environmental conditions the ferrite cores will encounter during use.

IEC 61333:2019 specifies marking locations and a coding system of marking on ferrite cores. An alphanumerical marking printed or attached to cores reduces the risk of incorrect assembly, mixing of materials and/or mixing of gapped cores on an assembly line.

The markings of the inductance factor AL value or of the gap length are especially important to avoid this kind of problem, and their coding system is specified in this document.

This edition includes the following significant technical changes with respect to the previous edition:

a) the title of the document was changed;
b) the scope of this document was expanded;
c) the marking position instructions for ring cores, planar cores, RM-cores, PQ-cores and pot-cores were added in Clause 4 with a few additional descriptions;
d) the four-digit-maximum limit of material identification code has been deleted in 5.2;
e) in Table 1, the unit of AL has been changed from "nH" to "nH/N²".