元器件可靠性降额准则

一低头的温柔

本标准规定了电子、电气和机电元器件（以下简称元器件〕在不同应用情况下应降额
的参数及其量值；同时提供了若干与降额使用有关的应用指南。
1 主题内容 .................................................................................................................... 5
2 引用文件 .................................................................................................................... 5
3 定义 ........................................................................................................................... 5
3.1 降额 derating.................................................................................................................................................5
3.2 额定值 rating.................................................................................................................................................5
3.3 应力 stress.....................................................................................................................................................5
3.4 应力比 stress ratio.........................................................................................................................................5
4 一般要求 .................................................................................................................... 5
4.1 降额等级的划分..............................................................................................................................................5
4.2 降额的限度......................................................................................................................................................6
4.3 降额量值的调整..............................................................................................................................................6
4.4 降额等级的确定..............................................................................................................................................6
4.5 元器件的质量水平..........................................................................................................................................7
5 详细要求 .................................................................................................................... 7
附录 A 率模型与降额准则的确定 ................................................................................ 30
附录 D 功率线绕电阻器脉冲功率与脉冲宽度曲线及应用 ............................................ 37
附录 E 功率型线绕电阻器功率－散热面积曲线的应用 ................................................ 38
附录 F 电感元件热点温度的确定................................................................................. 38
附录 G 元器件降额准则一览表.................................................................................... 39