Flexible printed circuit board
PCB manufacturers must ensure that the entire product complies with RoHS. This includes sourcing only RoHS compliant materials and components. It also involves working closely with suppliers to understand their compliance status, as well as establishing traceability systems for all materials used in the manufacturing process. In addition, the manufacturer must prepare and submit a Declaration of Conformance to prove that the product complies with RoHS directives.
During the early years of flexible printed circuit board development, there was limited choice in laminates and electronic components that did not use lead. Fortunately, these days there are many advanced halogen-free laminates and components available for the circuit board designer that have enhanced thermal properties to reduce the need for heavy metals. In addition, many manufacturers have moved to using advanced soldering alloys that are free of lead.
In order for a printed circuit board to be considered RoHS compliant, the legend inks and solder mask must contain no harmful substances. These inks must be able to restrict the surface temperature of the board to prevent discoloration due to the higher temperatures required for RoHS assembly processes. This is achieved by specifying a material with a Tg rating of at least 170 C degrees. The legend inks must also be free of harmful chemicals such as lead, cadmium, mercury and others.
How is RoHS compliance ensured in Flexible printed circuit board?
The substrate material for the PCB must be free of harmful substances as well. This is achieved by specifying a laminate that does not contain toxic chemicals such as lead, cadmium, and mercury. Moreover, the circuit board manufacturer must utilize a lead-free solder alloy for soldering wires and components on the PCB. Moreover, the soldering process must be monitored to avoid any toxic fumes from being released during soldering.
In addition to the above, PCB manufacturers must work with suppliers to ensure that all of their materials and components are RoHS compliant. This includes evaluating the elemental concentrations of all components and materials through X-ray fluorescence instruments. The PCB manufacturers must then document and keep records that demonstrate the products comply with RoHS directives.
A good way to ensure that a printed circuit board is RoHS compliant is to use a design tool such as Cadence’s OrCAD PCB designer. This program enables the designer to specify a RoHS compliant part number and a specific component number. This helps to avoid the confusion of referring to multiple part numbers for different versions of the same component. In addition, the tool automatically assigns a unique part number to every component on the PCB. This ensures that the board will be fully traceable throughout its production history. This is an essential aspect of ensuring RoHS compliance and provides peace of mind to the customer that their board was built with only RoHS compliant components. It is also a great way to streamline the quoting process. This will save a significant amount of time and resources for the engineering department and help to ensure that all orders are processed accurately.
