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.

Line-side impedance (Ω)

Required number input.

Port-side impedance (Ω)

Required number input.

Compute the transformer turns ratio of Ethernet magnetics from the line-side and port-side impedances as the square root of their ratio. 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]

Turns ratio

The resulting turns ratio returned as a number.

• Ethernet delay, overhead, magnetics, and link calculations depend on the exact PHY, encoding, frame sizes, cabling category, topology, negotiation, and protocol layers. Application throughput and latency also include queuing, retransmission, and software effects.
• 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.

• Impedance Ratio

  Compute the transformer impedance ratio as the square of the turns ratio.

• Current Ratio

  Compute the transformer secondary current from the primary current and winding turns.

• Turns Ratio

  Compute the turns ratio of a transformer from its primary and secondary winding turns.