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.

Clamping voltage (V)

Required number input.

Pulse current (A)

Required number input.

Pulse duration (s)

Required number input.

Estimate minimum varistor pulse-energy rating from a rectangular clamping-voltage and pulse-current approximation; compare with the actual waveform and derating. 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]

Minimum pulse-energy rating (J)

The resulting minimum pulse-energy rating returned as a number.

• TVS, varistor, and Zener protection depends on surge waveform, source impedance, clamping current, dynamic resistance, parasitic inductance, temperature, repetition, energy rating, tolerance, and degradation. Nominal voltage is not the protected-node peak.
• 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.

• Esd Clamping Voltage

  Estimate ESD protection clamping voltage with a fitted dynamic-resistance model V=Vbr+I Rd; use device pulse-current data for the chosen waveform.

• DAC Glitch Energy

  Estimate actual energy dissipated in a resistive load by a rectangular DAC glitch pulse as V²t/R; datasheet glitch impulse in volt-seconds is a different quantity.

• TVS Peak Pulse Power

  Calculate peak transient-voltage-suppressor pulse power as clamping voltage multiplied by peak pulse current at the same point on the device curve.