Bond Wire Inductance Calculator

Estimate the parasitic inductance of an isolated round bond wire as 0.2·l·(ln(4·l/d)-0.75) nH where l and d are length and diameter in mm. Assumes straight wire in free space and l >> d.

Description

Estimate the positive partial inductance of a straight isolated round bond wire from length and diameter.

Estimate the parasitic inductance of an isolated round bond wire as 0.2·l·(ln(4·l/d)-0.75) nH where l and d are length and diameter in mm. Assumes straight wire in free space and l >> d.

When to use Bond Wire Inductance Calculator

  • Estimate the positive partial inductance of a straight isolated round bond wire from length and diameter.
  • Compare fabrication or device scenarios while holding coefficients and unit conventions constant.
  • Check a hand calculation before moving to a higher-fidelity process, circuit, or TCAD model.

How the calculation works

The logarithmic geometry term must remain positive; short, thick geometries are outside this slender-wire approximation.

L[nH] = 0.2·l[mm]·[ln(4l/d)−0.75]

Interpreting the result

The logarithmic geometry term must remain positive; short, thick geometries are outside this slender-wire approximation.

Assumptions and limitations

  • Return path, loop shape, nearby conductors, skin effect, mutual inductance, and package dielectric are not included.
  • Use parameters measured for the same material, geometry, temperature, and operating regime whenever the result informs engineering work.
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