Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Layer

Required string input.

Allowed temperature rise (°C)

Required number input.

Copper cross-section (mil²)

Required number input.

Estimate PCB trace current with the legacy IPC-2221 empirical equation I=k·ΔT^0.44·A^0.725, with A in square mils and k=0.048 external or 0.024 internal. This is a rough thermal estimate; modern IPC-2152 data and board-specific validation are preferable for design sign-off. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Estimated current (A)

The resulting estimated current (a) returned as a number.

• PCB trace calculations depend on finished copper thickness, geometry, dielectric stack-up, temperature rise criterion, ambient, neighboring conductors, return path, frequency, surface finish, and fabrication tolerance. IPC equations are approximations, not a substitute for the board fabricator's stack-up or field solving.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• PCB Via Current from Thermal Model

  Estimate via current from an allowed temperature rise and user-supplied effective thermal resistance using I=sqrt(ΔT/(R_electrical·R_thermal)). Barrel electrical resistance uses copper resistivity, length, and plated annulus area. This simplified lumped model requires board-specific thermal resistance.

• Ferrite Core Area Product

  Estimate required ferrite core window-area × cross-section from the Magnetics design form WaAc=Pout·Dcma/(Kt·Bmax·f). Enter circular-mils-per-ampere current-density allowance, gauss, hertz, and the topology constant from the same design method; output is cm⁴.

• FPGA Hold Time Slack

  Compute simplified hold slack as minimum clock-to-output plus minimum data-path delay minus hold time and adverse skew. Positive slack meets this model; use actual launch/capture clock paths for sign-off.