Why do electronic components need aging test?

Time:

2022-12-02 15:56

During the processing of electronic products, due to the complex processing and large use of component materials, both processing defects and component defects can be divided into obvious defects and potential defects. Obvious defects refer to those defects that cause the product to fail to work normally, such as short circuit/open circuit
The potential defects lead to the temporary use of the product, but the defects will be exposed quickly in use, and the product cannot work normally. Potential defects cannot be found by conventional inspection methods, but eliminated by aging methods
If the aging method is not effective, the potential defects that are not eliminated will eventually show up in the form of early failure (or failure) during product operation, resulting in an increase in product repair rate and maintenance costs
What is aging test
Burn in refers to the continuous application of environmental stress to components at a certain ambient temperature for a long time. The ESS (Environment Stress Screen) includes not only high temperature stress, but also many other stresses, such as temperature cycling, random vibration, etc. It accelerates various physical and chemical reaction processes inside components through the combined action of electric thermal stress, To promote the early exposure of various potential defects hidden in components, so as to eliminate early failure products
Function of aging test
01 It has a good screening effect for a series of defects that may exist in the process of manufacturing, such as surface contamination, poor lead welding, channel leakage, silicon chip cracks, oxide layer defects and local hot spots
02 For components without defects, aging can also promote the stability of their electrical parameters
Aging test items
The main items of aging test are:

 

Light aging test

Light aging is the main aging damage to outdoor materials, and indoor materials will also be subject to light aging to a certain extent. The three main lamp sources for simulating light aging have their own advantages. The carbon arc lamp was first invented and used. The measurement system was established earlier. Many Japanese standards and fiber material standards use carbon arc lamps. However, due to the high price and unstable performance of carbon arc lamps (lamps need to be replaced after 90 hours of use), they have been gradually replaced by xenon arc lamps and ultraviolet lamps. Xenon lamp has great advantages in simulating natural light, and its price is relatively low, which is suitable for most products
The ultraviolet lamp produces light below 400nm, which can better accelerate the destruction of materials by ultraviolet rays in simulated natural light. The acceleration factor is higher than that of xenon lamp, and the stability of light source is also better than that of xenon lamp, but it is easy to damage the output of non natural light (especially UVB lamp)
Main application scope: rubber, plastic, paint, ink products for outdoor and indoor use, communication, electrical and other equipment shells, auto parts, motorcycle accessories

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