IEC 62211-2003 pdf – Inductive components – Reliability management.
1 Scope This International Standard is applicable to inductive components (chokes and transformers) based on magnetically soft materials. These are especially components based on laminated iron sheets, iron powder materials (including alloys), as well as ferrites and amorphous or crystalline metal band cores. Winding assemblies means wire winding assemblies as well as multilayer and stacking technologies of planar technology including the coil based on non-magnetic materials. Discrete type components and the different types of surface-mountable inductive components (SMD) are also considered in this standard. The reliability of assemblies of inductive components based on several technologies such as glued types, types with clamps (clips), impregnated (varnished) types as well as (vacuum) potted types can also be checked with this standard. The subsequent determinations can be applied either for the primary qualification of inductive components or for all ways of requalification examinations (design, process, change of production facility). They can also be applied for the monitoring of products out of actual manufacturing processes. This standard sets up a broad basis of electric and mechanical criteria of failure test procedures. If manufacturers advertise compliance with this standard in their data sheets, customers may request data to demonstrate compliance to this standard. The customers may also request the product to be in compliance to this standard by a recognised national institute. Customers and manufacturers may elect to perform additional testing and acceptance criteria different than those defined in this standard.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-2-1 , Environmental testing – Part 2: Tests. Tests A: Cold IEC 60068-2-2, Environmental testing – Part 2: Tests. Tests B: Dry heat IEC 60068-2-6, Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal) IEC 60068-2-1 4, Environmental testing – Part 2: Tests. Test N: Change of temperature IEC 60068-2-20, Environmental testing – Part 2: Tests. Test T: Soldering
IEC 60068-2-27, Environmental testing – Part 2: Tests. Test Ea and guidance: Shock IEC 60068-2-29, Environmental testing – Part 2: Tests. Test Eb and guidance: Bump IEC 60068-2-30, Environmental testing – Part 2: Tests. Test Db and guidance: Damp heat, cyclic (12 + 12-hour cycle) IEC 60068-2-58, Environmental testing – Part 2-58: Tests – Test Td – Test methods for solderability, resistance to dissolution of metallization and soldering heat of surface mounting devices (SMD) IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state IEC 60424 (all parts), Ferrite cores – Guide on the limits of surface irregularities IEC 61 007,Transformers and inductors for use in electronic and telecommunication equipment – Measuring methods and test procedures IEC 61 248 (all parts),Transformers and inductors for use in electronic and telecommunication equipment 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 reliability of inductive components component level reliability of the inductive component in the customers’ electrical circuit application 3.2 component level reliability tests sequence of tests performed on an individual component, each specific test being designed to represent conditions under which the component is expected to operate in end applications NOTE Categories of test levels are organised to be consistent for typical applications. 3.3 system level reliability tests sequence of tests performed on a collection of components as arranged in a specific end application under working conditions
4 Component families In a similar way to the qualification rules contained in IEC 61 248, reliability tests can be performed on typical samples representing families of inductive components. A family of inductive components is defined on the basis of: – the same application class as specified in the IEC 61 248 series; – the same magnetic base material group (for example ferrite, metal powder, etc.); – the same core shape (for example E-type, RM, ring core, etc.); – the same winding type (for example wire-wound, multilayer, stack, etc.); – the same termination configuration (PTH, SMD etc.); – comparable accessories and insulating materials (bobbin, clamps, insulating tapes, etc.); – the same insulation principle (encapsulation, impregnation, potting). This means that reliability tests for a family of unencapsulated, wire-wound PTH transformers on RM ferrite cores, for instance, can be carried out representatively on small and large size models (for example RM4 and RM1 4). Similar conclusions applied to the other sizes regarding reliability can be made, as long as one can prove that all materials used are the same in terms of their load characteristics 1 . 5 Test samples 5.1 Classification by application With regard to their application in accordance with the rules of the IEC 61 248 series, the inductive components to be specified here are classified into the following classes: – signal transformers (ST); – power transformers (PT); – power transformers for SMPS (PTS); – pulse transformers (IT); – inductors (chokes) (C); – RF inductors (RF); – intermediate frequency transformers (HF).