How is PCB Trace Width Calculator: Current and Temperature Rise calculated?

Use I = k ΔT^0.44 A^0.725; width = A/thickness. Estimate internal and external PCB trace width with the IPC-2221 empirical model. Check copper thickness, temperature rise and model limitations.

Sources: digikey.com [1]

How do I calculate this example: I = 1 A, ΔT = 10 °C, k = 0.048?

A ≈ 10.73 mil². This is a calculated example under the model stated above; it is not a measured component specification.

Which units does PCB Trace Width Calculator: Current and Temperature Rise use?

In the empirical current equation, I is in A, ΔT in °C and cross-sectional area A in mil²; k = 0.048 for outer layers and 0.024 for inner layers. Divide area by copper thickness in mil to obtain width in mil.

Sources: digikey.com [1]

Does this use IPC-2152 thermal charts?

No. This calculator uses the IPC-2221 empirical relationship. IPC-2152 considers additional board and thermal factors; do not present this result as an IPC-2152 validation.

Sources: digikey.com [1]

Does current-based width also set controlled impedance?

No. Controlled impedance also depends on dielectric height, permittivity, reference planes and coupling. Check current capacity and impedance separately.

Sources: polarinstruments.com [1]

Is this a fabrication or thermal guarantee?

No. Use the actual stackup, copper geometry and operating conditions. Confirm critical designs with the PCB fabricator, a field/thermal solver or measurements.

Sources: polarinstruments.com [1]