Trace resistance Calculation, Formula, Example

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Trace Resistance
Trace Resistance

Trace resistance calculator

The trace resistance of a microstrip is important in determining how much power it dissipates. By determining its trace resistance, the contribution of a microstrip to the overall circuit resistance can be evaluated. This tool is designed to calculate the resistance of a microstrip trace with a copper conductor. To use it, specify the trace dimensions and the ambient temperature.

Diagram

Trace Resistance
Trace Resistance

Formula

Trace resistance Calculation, Formula, Example

Where:

ρ=resistivity

L= length

W=trace width

T=trace height

For ρ and α there is a constant value

ρ = 1.7*10־6 Ω

α = 3.9*10־3 Ω

Example

Let’s calculate resistance by using trace resistance consider inputs Length (L)= 2-inch, Width(W)= 3mm, Trace height (T)= 2mm Temperature(T)= 30 deg.

By applying formula

Trace resistance Calculation, Formula, Example

R=(1.7*10־6 *2/(4*3))*(1+3.9*10־3*(30-25))

Result:

R=0.00033017 Ω

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