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.

Switch current at turn-off (A)

Required number input.

Turn-off (rise) time (ns)

Required number input.

Allowed voltage spike (V)

Required number input.

Compute the snubber capacitance C = I_off x dt / V_spike that limits the turn-off voltage spike. 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]

Snubber capacitance (nF)

The resulting snubber capacitance returned as a number.

• Snubber sizing depends on measured or modeled parasitic inductance and capacitance, switching waveform, damping target, repetition rate, component pulse rating, temperature, and layout. An incorrect network can increase loss or device stress.
• 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.

• Decoupling Cap Value

  Compute the decoupling capacitance C = I x dt / dV needed to supply a transient current for a droop time within an allowed droop voltage.

• Holdup Cap Value

  Compute the capacitance required to hold up a load from the input voltage down to a minimum voltage for a given time at constant power.

• Ripple Voltage

  Compute capacitor ripple voltage as ripple current divided by twice the product of frequency and capacitance.