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Safe Handling For PCBs
While printed circuit boards don't seem like they're easily breakable, there are a few threats that even the most well built PCBs have to deal with that you may not have considered. Two of the biggest threats are:
- Electrostatic Discharge (ESD)
When static electricity builds up between two objects, or two people, or a person and an object, and the electricity discharges, it is called Electrostatic discharge. ESD has been known to cause damage to some electronic components. In the case where a person has built up a large static charge, and touches a printed circuit board in the wrong place, they could damage the whole PCB assembly.
- Electrical Overstress (EOS)
Electrical Overstress happens when tools like soldering irons, test instruments, solder extractors and other electronic devices build up an excess of energy. It is necessary to use equipment that has been designed to avoid EOS.
Learn how you should be caring for printed circuit boards.
There are measures that must be taken so that your PCBs, especially pcb prototypes, are not exposed to these issues.
Safe Handling Procedures
When preventing ESD and EOS, it is critical that you have a proper work space, and follow these safety precautions:
- PCBs should only be worked on in a proper work space that has sufficient grounding and static dissipation of the work surface and the floor.
- Work areas should be kept free of static generating materials like Styrofoam, vinyl, plastic, rubber, and fabrics
- Do not eat, drink, or smoke at your work area. Even the slightest contamination or mess could really put your circuit board in bad shape.
- You have to be grounded when handling circuit boards for your own safety. To be safe, most people will use a wrist strap that is connected to an earth ground and also heel grounders on each foot that connect to the static dissipating floor.
- Always handle PCBs by their edges and try to avoid making contact with any components or circuits.
- Any electrical component also needs to be handles by its edges and you shouldn't come in contact with any leads
- Avoid using hand creams, soaps, and lotions that contain silicone. This could negatively impact the adhesion of solder or epoxy
- Stacking printed circuit boards is not a good idea. Damage may result
When you aren't working on a PCB anymore, it should be stored in a shield container. Here are 3 ESD protective containers:
- Static Shield. These prevent any static charge from passing through the packaging
- Antistatic. These offer antistatic protection for electronics
- Static dissipative, which is an outer layer of protection that is conductive to prevent static build up within electronic parts
Get some quick tips for handling prototype boards.
You should be able to find these containers and various ESD and EOS protective gear online or at an electronics supply store.
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