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具有定义温度系数（电介质1类）的固定无封装表面安装多层陶瓷介质电容器。这些电容器具有金属化连接焊盘或焊接条，并设计用于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，这些电容器由IEC 60384-14覆盖。本文档的目的是指定首选额定值和特性，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。参考本文件的详细规范中指定的测试严格性和要求提供了相同或更高性能水平的具体测试严格性和要求。关于通用、分部和详细规范概念的更多信息可以在IEC 60384-1:2021的简介中找到。 [外文原描述]： 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revised accordingly; Annex X contains all cross-references of changes in clause/subclause numbers; b) the terms have been replaced by the letter symbols in Table 3; c) code of temperature coefficient and tolerance of C0G, U2J have been added in Table 4, Table 6, Table 8, Table 9, Table 11,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.