Shelf Life of a PCB Fabrication Assembly
PCBs are vital to the operation of electronic devices and serve a number of important purposes, from connecting wires to ensuring power flows smoothly. However, these flat sheets are also vulnerable to different environmental conditions, which can impact the performance and reliability of the board over time. That’s why knowing the shelf life of a pcb fabrication assembly is so important for customers to understand. In this article, we’ll explore what factors determine the shelf life of a PCB and how customers can extend its lifespan.
The first factor that impacts the shelf life of a printed circuit board is the type of surface finish. Traditional lead-based finishes have a shelf life of two years, while newer finishes like immersion silver and organic solderability preservatives can last up to six months after packaging. These differences are due to the amount of silver and tin on the PCB, which alters its solderability over time.
Another issue is the temperature and humidity of the storage environment. High temperatures and humidity can shorten the life of components, resulting in corrosion, migration, and degradation. In addition, moisture can cause the surface of a printed circuit board to crack and become brittle, which makes it harder to assemble.
To minimize these effects, the storage environment should be kept at a relatively stable temperature of about 75°F and between 60–85% relative humidity. In addition, a PCB’s shelf life can be extended through the use of a conformal coating, which provides an extra layer of protection against environmental conditions.
What is the Shelf Life of a PCB Fabrication Assembly?
Finally, the components used in a PCB can also have an effect on its shelf life. Some components are very sensitive to moisture and are typically labeled with a moisture sensitivity level (MSL) that indicates the amount of time a component can be exposed to moisture before it becomes damaged or unusable. In addition, these components are usually stored in dry packages to prevent the onset of moisture.
The shelf life of a PCB can also be impacted by the way it is handled and shipped. If a PCB is not handled properly, it can be contaminated by sweat, chemicals, or dirt from the hands of the person handling it. This can cause the PCB to oxidize and lose its solderability, which reduces its overall performance. This is why it is crucial for CMs to follow storage and shipping standards and ensure that their employees are wearing gloves when handling PCBs.
They should also conduct regular electric or physical examinations of their inventory to identify early signs of damage or deterioration. These examinations can help them ensure that their products meet regulatory and quality standards. This will enable them to sell their products safely and reliably to customers. This will ultimately boost their reputation and increase their revenue. This is especially true when they can demonstrate that their products are dependable, durable, and safe to use.
Before physical fabrication, thermal simulation and analysis tools are used to predict and optimize the thermal behavior of PCBs. These tools model heat generation and dissipation, identifying potential hotspots and allowing designers to make informed decisions about material selection, component placement, and cooling strategies.
