Declaration: Regulatory Requirements That Reach the PCB
Every electronic product is subject to regulations that have nothing to do with whether it works, and the ones that reach the board are about materials, marking and energy. Knowing which apply early prevents a redesign at the point of certification.
Restricted Substances
The restriction on hazardous substances in electrical equipment limits the concentration of a defined list of materials in the finished product, and the limits apply to the homogeneous material rather than to the assembly as a whole.
The consequence for the board is that the laminate, the solder, the finish and the mask all have to be declared. A tin-lead finish on a board that is otherwise compliant makes the product non-compliant. Our surface finish notes describe the alternatives.
Declarations and the Supply Chain
Compliance is established by declaration rather than by testing, and a declaration from the manufacturer of each material is what supports the claim. The declarations have to be collected and retained, and they have to cover the specific grade used.
Where a substitute material is used without a declaration, the compliance of the whole product becomes an assumption. That is why a change of laminate after the compliance file is complete is a commercial event as well as an engineering one.
Marking and Identification Requirements
Products are required to carry certain information, and the board is often where it is placed because it survives the life of the product. The requirement usually covers the manufacturer, the model and the date of manufacture.
Where the information is on the board, its position and legibility become part of the compliance file. A mark that is obscured by a cable or a connector is a mark that does not satisfy the requirement. Our traceability marking notes describe the encoding.
Energy Efficiency and Standby
Requirements on standby power and on efficiency reach the board through the choice of components and through the design of the power supply. A linear regulator that dissipates a watt in standby will fail a requirement that a switching converter meets.
The measurement is made on the complete product, so the board’s consumption includes everything else in the enclosure. The specification should therefore be set with the whole product in mind rather than with the board alone.
<img src="https://www.gopcba.com/wp-content/uploads/2026/06/IATF-16949.jpg" alt="Isolation barrier with creepage spacing on a PCB” />
Electromagnetic Compatibility Requirements
An emission and immunity requirement applies to the product rather than to the board, and the board is where most of the margin is won or lost. The requirements should be known before the layout begins, because a fix applied after the enclosure is tooled is expensive.
The standards specify the test conditions as well as the limits, and the conditions determine the layout measures that matter. Our EMC notes describe the layout measures.
Safety and Isolation Requirements
Where the product connects to mains or to a hazardous voltage, the requirements on creepage and clearance are set by the installation category and by the pollution degree. Those figures come from the standard and they are not negotiable.
The isolation barrier has to be respected on the layout, which means the spacing across it is larger than elsewhere and no conductor crosses it except through the isolating device. Our creepage notes describe the spacing rules.
Documentation for Certification
The certification file contains the declarations, the test reports, the marking specification and the bill of materials. The bill of materials is the document that links the others, because it is what identifies the materials that were declared.
Where the board is changed without updating the file, the certificate no longer describes the product. That is the practical reason change control matters beyond manufacturing.
Planning for Compliance Early
The decisions that determine compliance are the material, the finish, the flux chemistry, the marking and the isolation spacing. Each is made at the design stage, and each is expensive to change later.
Establishing the applicable requirements before the stack-up is chosen is therefore the cheapest approach. The alternative is a compliant redesign after the first test. Our design release checklist lists the items to confirm.
Process Control and Verification
On a design of this kind, material declaration is the item that decides how the rest of the board is arranged. A short note on the drawing about handling, storage or packaging is often worth more than an extra decimal place on a tolerance. Where a value sits close to a process limit, the drawing should say so, since the shop can then open the process window rather than working to a nominal figure that carries no tolerance.
A stack-up that is drawn rather than described removes most of the ambiguity from a quotation, and it lets the fabricator price the board against the dielectric and copper weights that will actually be used. Where the requirement is not written down, the shop supplies its own default, and the default is chosen for the process rather than for the design.
The measurements that matter are the repeatable ones: conductor width and spacing, annular ring, finished hole size, plating thickness and surface finish are all verifiable on a coupon that travels with the panel. Running a first article through the same checks as the production panel confirms that the two agree, and that comparison is the cheapest form of process control available at prototype stage.
Process Control and Verification
On a design of this kind, material declaration is the item that decides how the rest of the board is arranged. A short note on the drawing about handling, storage or packaging is often worth more than an extra decimal place on a tolerance. Where a value sits close to a process limit, the drawing should say so, since the shop can then open the process window rather than working to a nominal figure that carries no tolerance.
A stack-up that is drawn rather than described removes most of the ambiguity from a quotation, and it lets the fabricator price the board against the dielectric and copper weights that will actually be used. Where the requirement is not written down, the shop supplies its own default, and the default is chosen for the process rather than for the design.
Process Control and Verification
On a design of this kind, material declaration is the item that decides how the rest of the board is arranged. A short note on the drawing about handling, storage or packaging is often worth more than an extra decimal place on a tolerance. Where a value sits close to a process limit, the drawing should say so, since the shop can then open the process window rather than working to a nominal figure that carries no tolerance.
FAQ
Is a lead-free finish sufficient for compliance? It is one of the requirements. The laminate, the mask, the flux and the components are also in scope, and each needs its own declaration.
Does the board need to carry the compliance mark? The finished product usually does, and the board may carry it as well. Where the board carries it, the mark becomes part of the compliance file and cannot be changed without a re-assessment.
What does gopcb provide for a compliance file? We provide material declarations for the laminate, the mask, the finish and the solder, together with the certificates of conformity and the process records. We also declare any process chemical that could leave a residue on the board.
