The warranty period of crystal oscillators is the same as the preservation period of food. The products closest to the production date are often bought with confidence. As for the warranty period of crystal oscillators, different manufacturers have different periods. In the past, the warranty period for electronic products was not as required today, from acceptable delivery within 3 years to within 2 years, or even within one year. So, is the warranty period really an effective protective umbrella for crystal oscillators?
　　Why do electronics factories begin to pay attention to the warranty period of crystal oscillators? Everyone knows that the evolution of crystal oscillators has changed from the initial plug-in crystal oscillators to the commonly used SMD crystal oscillators. For example, plug-in crystal oscillators, whether cylindrical or 49S crystal oscillators, and ceramic plug-in crystal oscillators, are their packaging. The methods are all in bags, as shown below.
　　What is the connection between the packaged crystal oscillator and the warranty period? The packaging form of the plug-in crystal oscillator is often due to the plug-in, and the packaging bag is punctured in the storage method. At this time, it does not matter. The main thing is the environment. If the storage environment is relatively humid, the plug-in crystal oscillator is easy to occur over time. Oxidation, oxidation will make the crystal pin can not be tinned. Guangruitai said that the environmental requirements of the finished warehouse of general electronic components are +25/-5 degrees and the humidity is below 70%. With the widespread use of chip crystal oscillators, and for the welding of automatic placement machines, the packaging form has changed to braid.
　　The advantages of tape packaging compared to bag packaging are obvious, with absolute air tightness. For the shelf life, there is currently no universal standard in the country. For electronic components, it is not a problem of the deterioration of their characteristics over time, but a quality problem caused by the oxidation of the soldering surface. Therefore, there are no strict requirements on the warranty period for components in the form of SMD packages. In fact, there are no hard and fast regulations for this issue. It can only be said that the closer the production date, the more oxidation of the component pins will be. The smaller, the smaller the solderability, of course, the performance is more stable and more guaranteed.