The time constant of an RC circuit is the product of its resistance and capacitance. For R in ohms and C in farads, the time constant t is in seconds.
t = RC
5RC Rule of Thumb: A capacitor charges or decays to within 1% of its final value in 5 time constants.
Rise Time: Time required to go from 10% to 90% of Vout.
Last modified: 05/20/2003