LM324N is a quad operational amplifier (Op-Amp) integrated circuit. It contains four independent, high-gain, frequency-compensated operational amplifiers. The LM324N is capable of operating over a wide range of voltages, making it suitable for use in a variety of applications. It is used in many circuits such as comparators, buffer amplifiers, voltage regulators, and converters. The LM324N is designed for use in low-power applications, where it provides low input bias current, low offset voltage, and high input impedance.