Are you still confused why factories do not want to buy newly original electronic components?
There are following two reasons.
1.Expired Date Code
Like all the other diary food, IC Components are also has expired date. The main reason caused this problems are owing to such products are easily go oxidation. All the parts need to be store well, if not , the foot of it will go bad firstly. Compared to gold-plated pin ,the impact of oxidation to silver plating pin is much more serious because silver easily has chemical reaction with air. based on the above reasons, some manufacturers will suggest lifetime of the electronic components. Normally, life time of passive devices is from half to 1 year.
Take an example, aluminum electrolytic capacitor in the condition without voltage, domestic ones can store in one year, some can be store 2 years. If aluminum electrolytic capacitor do not charge and discharge, the surface of alumina layer will oxalate soon.
Now the electronic components are generally delivered by logistic companies. However, those work staffs are not trained well. If the products do not have special package, in the way of transporting , they are easily to be damaged. Products as LED, bulbs are fragile. In the event of deliver, the package should be shockproof.
Similarly, static sensitive devices, must use antistatic packaging; tidal sensitive components, must have the hermetic packaging.
Those reasons above explained why newly original IC Components are refused to be accept. To avoid it, we should improve the understanding of the products. Moreover, package and storage are rather important. If the date code and package are identified in business negotiations, the rejections will happen rarely.