Reliability There are two ways to describe the reliability of electronic components: quality grade and failure rate level. The former is often used to evaluate the reliability level of certain components and electronic devices, while the latter is more suitable for describing the reliability level of most electronic components. When predicting the reliability of electronic equipment based on GJB/Z299B, the parameter "quality grade" is usually required.
Failure Rate Currently, failure rate is mainly used to quantitatively describe the reliability of a product. This characteristic number refers to the probability that a product, which has been operating normally until a certain point in time, will fail within a unit of time after that point. As a primary basis for judging product reliability, the failure rate level is often closely related to the component's quality and reliability level. Currently, the expression methods used in different versions of national military standards usually have clear differences. For example, GJB65A-91 divides the failure rate levels of relays into four levels, from low to high: Y/W/L/Q, and indicates that capacitors also follow the above regulations. GJB244-87 classifies component failure rates into four levels: W/L/Q/B. For components such as electrical connectors and mica capacitors that are manufactured on national military standard production lines, have passed certification, and are listed in the product catalog but lack reliability indicators, relevant personnel usually use J to describe their quality assurance level.
