Step 1
Use the maximum allowable inrush current and Ohm's Law to determine the least allowable resistance at turn on for your application.

Lowest Resistance Calculator

V*1.414/A
Input Voltage
Max Inrush (A)
Lowest Resistance Needed
 

Step 2
Determine the maximum steady state current that will flow through the Inrush Current Limiter.

Joules Calculator

Voltage (Vpeak)
Capacitance (µF)
Total Energy (J)
 

Step 3
Using the formula J = ½CV², determine how much input energy the thermistor will absorb when the device is turned on.

Steady State Current Calculator

Vac/P(out) * 90% efficiency
Output Power
Input Voltage
Steady State
Current