What are laboratory failure analyses? Experience of failure analysis of electronic components

Date：2022-04-26 14:44:56Views：1070

According to the failure mode and phenomenon, the general testing laboratory will simulate and reproduce the failure phenomenon through analysis and verification, find out the cause of failure and dig out the failure mechanism. It has strong practical significance in improving product quality, technology development and improvement, product repair and arbitration of failure accidents. The methods are divided into destructive analysis, nondestructive analysis, physical analysis, chemical analysis and so on.

Device failure will exist in the whole life cycle of the product. If there is no collection of failure information and failed devices in each stage, the failure analysis will lose the necessary "material" basis. Therefore, to carry out failure analysis, we must first establish the collection system of failure information and failed devices in the stages of development, production and engineering.

Failure early warning and startup analysis mechanism

Although failure analysis is important, it is not necessary and impossible to conduct a thorough analysis of any failure. In the product life cycle, device failure has obvious phased characteristics, and the causes of failure in different stages are also different. Therefore, a reasonable early warning mechanism and start-up analysis mechanism are very necessary. In practice, it should be handled flexibly according to the specific situation, and whether to start failure analysis should be decided according to the needs.

The number of failures in the development stage is small, but the relative failure rate is very high, and there are relatively many design and use problems and new device quality problems. At this stage, problems are found and the cost of change is low. Therefore, the early warning threshold should be appropriately reduced and the coverage of failure analysis should be increased.

The failures in the production stage mostly focus on early failure, batch material problems, ESD problems, tested stress problems and undetected design hidden dangers. For the device failure at this stage, the early warning threshold is relatively high.

The main causes of device failure in the engineering stage are early failure, batch material problems, undiscovered design hidden dangers, environmental problems such as lightning, humidity and vulcanization, accidental failure and loss failure. The early warning threshold at this stage should be between the development and production stages. Through the failure analysis work in the engineering stage, the obvious abnormal failure data can be removed, the actual device reliability data of the company can be accumulated for a long time, and the device failure rate, failure mode and mechanism database of the company can be established.

Information feedback mechanism

The links of failure include development, production, engineering and other stages, and the collection department of failure information also exists in multiple departments accordingly. If the failure information is not fed back to the failure analysis department in time, it is bound to affect the timeliness of failure analysis and the accuracy of analysis results. Therefore, effective feedback channels must be established to enable failure analysis engineers to timely understand the failure situation and analysis progress of devices.

Professional technology and personnel

Failure analysis is highly professional. From the perspective of the process of failure analysis, it can be mainly divided into failure confirmation, nondestructive testing, anatomical analysis, failure cause verification, improvement measure verification and other stages. In addition to the anatomical analysis conducted by professional analysis laboratories, the other stages also put forward higher requirements for the overall quality of failure analysts. Strictly speaking, the full-time failure analysis engineer should have rich experience in design and development, and be familiar with failure physics, hardware reliability, failure analysis instruments and their use.

Be good at summarizing and realize the technical improvement from point to surface

As far as a single failure analysis is concerned, its function and significance are very limited. The reason why this work is important is that it can provide ideas and clues for reliability work through failure analysis. Through the accumulation of several independent failure analysis, timely start the in-depth research on a certain type of device or a technical topic, so as to solve the problem at one level, which improves the role and significance of failure analysis. Therefore, failure analysts should have high technical sensitivity, be good at refining and summarizing, and constantly expand and deepen the breadth and depth of reliability work through daily failure analysis.

Shenzhen Chuangxin Online Testing Technology Co., Ltd. is a well-known professional testing organization for electronic components in China. It has three standardized laboratories with an area of more than 1000 square meters. The scope of testing services covers: testing and verification of electronic components, identification of IC authenticity, product design, material selection, failure analysis, function testing, factory incoming material inspection, X-ray testing of components, tape braiding and other testing items.