电子设备用固定电容器 第21部分：分规范.1类陶瓷介质固定表面贴装多层电容器

[中文适用范围]： 本部分IEC 60384适用于电子设备中使用的固定未封装表面安装多层陶瓷介质电容器，具有定义的温度系数（介质等级1）。这些电容器具有金属化连接垫或焊接条，并打算安装在印刷板上，或直接安装在混合电路的基板上。不包括用于电磁干扰抑制的电容器，但IEC 60384-14涵盖这些。本文档的目的是规定优先的额定值和特性，并从IEC 60384-1:2021中选择适当的质量评估程序、测试和测量方法，并为这种类型的电容器提供一般性能要求。参考本部分规范的详细规范中规定的测试严格度和要求具有相同或更高的性能水平；不允许较低的性能水平。参考本文档的详细规范中规定的测试严格度和要求提供了相同或更高性能水平的具体测试严格度和要求。关于通用、部分和详细规范的概念的进一步信息可以在IEC 60384-1:2021的引言中找到。 [外文原描述]： IEC 60384-21:2024 CMV contains both the official standard and its commented version. The commented version provides you with a quick and easy way to compare all the changes between IEC 60384-21:2024 edition 4.0 and the previous IEC 60384-21:2019 edition 3.0. Furthermore, comments from IEC TC 40 experts are provided to explain the reasons of the most relevant changes, or to clarify any part of the content. IEC 60384-21:2024 is applicable to fixed unencapsulated surface mount multilayer capacitors of ceramic dielectric with a defined temperature coefficient (dielectric Class 1), intended for use in electronic equipment. These capacitors have metallized connecting pads or soldering strips and are intended to be mounted on printed boards, or directly onto substrates for hybrid circuits. Capacitors for electromagnetic interference suppression are not included but are covered by IEC 60384-14. The object of this document is to specify preferred ratings and characteristics and to select from IEC 60384-1:2021 the appropriate quality assessment procedures, tests and measuring methods and to give general performance requirements for this type of capacitor. Test severities and requirements specified in detail specifications referring to this sectional specification provide specific test severities and requirements of an equal or higher performance level. Further information on the conception of generic, sectional and detail specifications can be found in the Introduction of IEC 60384-1:2021. This edition includes the following significant technical changes with respect to the previous edition: a) the document has been completely restructured to comply with the ISO/IEC Directives, Part 2 and to make it more useable; tables, figures and references have been revised accordingly; Annex X contains all cross-references of changes in clause/subclause numbers; b) the terms have been replaced by the letter symbols in Table 3; c) code of temperature coefficient and tolerance of C0G, U2J have been added in Table 4, Table 6, Table 8, Table 9, Table 11, Table 13, Table 16 and Annex B; d) the requirement in 5.5.2(visual examination) has been repeated in 5.9.3, 5.10.5, 5.11.4, 5.11.4, 5.13.7, 5.14.5 and 5.15.5; e) the deflection D in the very robust designs has been added in 5.9.1; f) Annex B has been changed informative into normative; g) Clause C.5 (Test schedule for quality conformance inspection) has been newly added to withdraw the blank detail specification: IEC 60384-21-1.