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Parallel Wires Inductance Calculator
Estimate the loop inductance and inductive reactance of a pair of parallel round conductors from length, diameter, spacing, and frequency.
Input Parameters
Results
For switching power loops, minimizing spacing is usually more important than wire diameter alone.
Equations Used
Two-Wire Loop Approximation:
L ≈ 4 × 10^-7 × l × [ln(D/r) + 0.25] H
Reactance:
XL = 2πfL
Where:
D = center spacing, r = wire radius, l = length
Frequently Asked Questions (FAQ)
Q1: What does parallel wire inductance represent?
It estimates the loop inductance of a current path and its return conductor.
Q2: Why does spacing matter?
Wider spacing increases loop area and raises inductance.
Q3: How do twisted pairs help?
Twisting keeps return current close and reduces loop area and EMI.
Q4: Can this be used for power leads?
Yes for first-pass estimates, but current distribution and layout geometry should be checked for high-current paths.
Q5: Is this the same as transmission line impedance?
No. It estimates inductance, not full characteristic impedance with capacitance.
Q6: How can I reduce loop inductance?
Reduce spacing, shorten the pair, use planes or busbars, and keep send/return conductors close.
