Current handling capacity of internal copper etched traces.

PWB Etched Internal Copper Current Capacity

The graph above shows the amount of current an Internal trace on a printed wiring board can handle.
The picture provides the current rating based on trace cross section in square mils, temperature rise and current in amperes.
For example; if the trace width is 100 square mils, that trace can accept between 1.5A and 4 amps depending on the acceptable temperature rise.

External Trace Capacity
Dictionary of PCB Terms
PWB Production Vendors

Key Phrase:
How much current will a buried trace handle
What is the current rating of a Internal trace
What trace width will handle a certain amount of current.
What is the Trace current rating

Chart of PWB External Etched Copper Current Capacity:
current rating based on trace cross section in square mils, temperature rise and current in amperes.
Graphic of Minimum Annular Ring, What is a Minimum Annular Ring.

RoHS - Restriction of Hazardous Substances [RoHS definition]
MIL-PRF-38535 - Integrated Circuits Manufacturing
MIL-PRF-31032 - Printed Circuit Board/Printed Wiring Board, General Specification for
MIL-PRF-55110 - Printed Wiring Board, Rigid, General Specification for
MIL-C-46058 - Insulating Compound, Electrical (For Coating Printed Circuit Assemblies)
MIL-C-47175 - Compound, Polyurethane, for Conformal Coating of Electronic Circuitry
MIL-C-14550 - Copper Plating, (Electro-Deposited)
MIL-I-46058 - Insulating Compound, Electrical (for Coating Printed Circuit Assemblies)
MIL-STD-275 - Printed Wiring for Electronic Equipment
MIL-STD-2118 - Flexible and Rigid-Flex Printed Wiring for Electronic Equipment Design Requirements for
MIL-T-10727 - Tin Plating: Electro-Deposited or Hot-Dipped, for Ferrous and Non-ferrous metals

Editor note; the list of mil specs is a handy reference, but those documents may be pulled from circulation at any time.

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