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.

Terminator count

Number of 120 ohm terminators installed on the bus.

Compute the effective CAN bus termination resistance from the number of 120 ohm terminators (one or two). 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]

Effective termination resistance (Ω)

The resulting effective termination resistance returned as a number.

• CAN timing and loading depend on oscillator tolerance, transceiver delays, propagation, bit timing, cable impedance, topology, termination, frame mix, and error traffic. Nominal bitrate-versus-length rules do not establish interoperability or standards compliance.
• 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.

• CAN Bit Rate from Cable Delay

  Estimate a CAN bit-rate ceiling using cable length, one-way propagation delay per metre, transceiver delay, and the permitted propagation fraction of a bit. This is a timing-budget estimate, not a substitute for bit-timing analysis.

• Common-Mode Choke Impedance

  Estimate one winding's series RL impedance magnitude at frequency f as √[R²+(2πfL)²]. Enter the effective common-mode inductance and resistance at the operating point; real choke impedance also includes core loss, capacitance, and self-resonance.

• Current Divider Calculator

  Compute the current through one branch of two parallel resistances: Ix = It * Rother / (Rx + Rother); the lower-resistance branch carries more current.