PCBA is the abbreviation of Printed Circuit Board Assembly, which means that the bare PCB board passes through the SMT assembly or the entire process of DIP plug-in, referred to as PCBA. More people pay attention to the service life of pcba and the reliability of high frequency operation. Few people will know about its shelf life. Today, now FASTPCBA technical engineer will come to tell you about this. In general, the shelf life of PCBA is 2 to 10 years.

What are the factors that affect the shelf life of PCBA circuit boards?

1. The environment

A humid and dusty environment is obviously not conducive to the preservation of PCBA. These factors will speed up the oxidation and dirt of PCBA and shorten the shelf life of PCBA. Generally, it is recommended to store PCBA in a dry, dust-free space with a constant temperature of 25 degrees Celsius.

2. Reliability of components

The reliability of components on different PCBAs also determines the shelf life of PCBA to a large extent. Components with high-quality materials and processes have the ability to withstand harsh environments, with a wider range of capabilities and stronger oxidation resistance, which is also PCBA Stability is guaranteed.

3. Material and surface treatment process of printed circuit board

The material of the printed circuit board itself is extremely unlikely to be affected by the environment, but its surface treatment process is greatly affected by air oxidation. Good surface treatment can extend the shelf life of PCBA.

4. PCBA board operating load

PCBA operating load is the most important factor in its shelf life. The operation of high frequency and high load will cause continuous and high impact on circuit board circuits and components, and will be more susceptible to oxidation when affected by heat, resulting in long-term operation. Short circuit, open circuit phenomenon appears. Therefore, the operating parameters of the PCBA board should preferably be in the middle value range of the components and avoid near the peak value, which can effectively protect the PCBA and extend its shelf life.

The shelf life of PCBA is a comprehensive work, which needs to follow scientific design specifications, manufacturing process specifications and operating specifications, so that the shelf life can be extended to the greatest extent.

How to extend the storage time of pcba?

1. Good storage conditions:

Means that the temperature is less than 25 degrees, the relative humidity is less than 65%, with temperature control, and no corrosive gas in the indoor environment.

2. General storage conditions:

Means that the temperature is not higher than 35 degrees, the relative humidity is less than 75%, and the indoor environment is free of corrosive gases.

The temperature of the warehouse where PCBA is stored is best controlled at 23±3℃, 55±10%RH. Under such conditions, PCBA boards with surface treatments such as gold, electro-gold, spray tin, and silver plating can generally be stored for 6 months. PCBA boards with surface treatment such as immersion silver, tin, OSP, etc. can generally be stored for 3 months.

For PCBA boards that have not been used for a long time, the circuit board manufacturer is best to apply a layer of three-proof paint on it. The role of the three-proof paint can prevent moisture, dust and oxidation. In this way, the PCBA shelf life will be increased to 9 months.