Shenmao Capacitors specialized in aluminum electrolytic capacitors from 1970

Industry observation | introduction to electronic components 'shelf life', after the expiration of the quality and how to ensure reliability?

by:Shenmao     2021-01-05
Most electronic products in certain environmental condition for quality after a period of time often changes, components is no exception. When stored more than the prescribed time limit, the quality and reliability will not guarantee, so must provide a storage period, can also be understood as 'shelf life' of food safety. Components of the storage period is finished from production and inspection to the installed before storage time under certain environmental conditions, and the components of effective storage period refers to the quality and reliability of the components in the storage period before the machine can meet the deadline set by our equipment, basic validity is not considering the effective storage time of component quality. 【 Factors that affect components storage period 】 Decision component the length of the valid storage period is closely related to the following three factors: ( 1) The quality of the components ( 设计、工业艺和材料) , is to ensure that the components in the effective storage period the basis of quality and reliability will not significantly degraded condition; ( 2) Components of storage environment conditions; ( 3) Qualified criterion of the components after storage. 在大多数元器件日本内阁总理规范和详细规范中均规定了前器件贮存环境,如sj331规定了半导体积体电路贮存环境条件为:- 10℃~ + 40℃,相对湿度≤80%; 美军标对于半导体积体电路贮存环境温度范围为- 65℃~+150℃。 下次就轮到日本这些标准中规定只是不超过范围的贮存环境,下面是前贮存器件的最佳环境。 GB4798。 1则规定奉行对于放精密仪器、元器件仓库环境各级为最高级,环境条件为:20℃~ 25℃; 遍及为20% ~ 70%; Air pressure is 70 kpa to 106 kpa. qj2222a则规定了通用贮存环境和特殊贮存两类环境条件。 通用贮存环境标准明确了前器件应贮存在清洁、通风、无腐蚀气体水平有温度对湿度和相控制的地方,温度及相对湿度见表1所示。 表1贮存环境条件分类i, ii, iii类环境条件各不相同。 i类,一般不需要对温度湿度进行调节; ii类,在个别季节需求对温度,湿度进行调节; iii类,则需求对温度,湿度进行调整才能满脚要求。 According to the storage environment conditions of special components, such as components that are sensitive to electrostatic discharge ( The MOS devices, microwave devices, etc. ) ,应按gjb1649规定,采集静电放电防护机构; Sensitive to magnetic field five components of magnetic mask, but is should be stored in a container with magnetic masking effect is; The sealing sheet components should be stored in inert gas seal container, or stored in taking effective anti-oxidation; Micromotor, such as mechanical and electrical components of the oil seal and the unit packing should be intact. 【 Components of the effective storage period. 美军标mil- S - 19500 e‘半导身体分立器件日本内阁总理规范》在早期释子规定了“积压”超过12个月半导身体税分立器件分类时需求,重新检验杞人忧天认为半导身体分立器件奉行效贮期是12个月语句。 MIL - after release S - 19500 f则规定了超过24个月半导身体分立器件,交货时岁需求重新检验; 后面发布新版本则规定了“积压”超过36个月的半导身体分立器件,交货时岁重新检验需求。 对于积体电路,美军标mil- M - 38510《半导体积体电路日本内阁总理规范》规定积体电路有奉行效贮期也从24个月延长为36个月。 国标等有效招聘了美军标,因此gjb33a‘半导身体分立器件通用规范》及gjb597a‘半导体积体电路通用规范》规定半导身体分立器和积件体电路奉行效贮36期也为个月语句。 The European space agency ( ESA) The ESA PSS - 01 - 60《esa空间系统的元器件选择,招聘购和控制’及欧洲空间标准化合作组织( ecs) ECSS - Q - 60 a《空间产品保证电子、电气和机电( EEE) 元器件》则规定了从元器件生产存共完成不到装机奉行超过了5年的库前器件,装机前应进行复验。 Which can be concluded that esa for the components of the storage period for 5 years. Above standard specification, with the development of the semiconductor device manufacturing technology and the increase of the cognition of objective things, people effective storage period and thus prolong the microelectronic device. 虽然美军标及欧标准都规定了奉行效贮期的期限( 3 years or 5 years) , but did not say what is in the storage environment of effective storage period. 对此只功能推测欧美仓库环境较好,东京都已达不到相当于i类贮存环境条件,这是驻国内的大多数仓库均很难都达不到i类贮存环境条件。 Moreover, different kinds of components in different aspects such as structure, material, process, so the effective storage period should also be different. But Europe and the United States will all components of the effective storage period shall be classified as 3 years or 5 years, this way may lack the scientific basis. 称呼针对欧美元器件有奉行效贮期这些问题,标准qj2222a及gjb / z123则明确了不同前器件上各自有奉行效贮期,该时不到前考虑回收器件质量等级与前器件有奉行效贮期关系,典型器件如表2所示。 同时标准qj2222a,还引入了与前器件质量等级以及与使用情况有关的修正系数,催前器件的质量等级及不同的使用情况,奉行对其效贮语句期进行了修正。
Custom message
Chat Online 编辑模式下无法使用
Chat Online inputting...