LM324N: Quad op-amp, 1MHz bandwidth, 3-32V single supply
Texas Instruments

The LM324N, manufactured by Texas Instruments, is part of a series of low-power, quad-operational amplifiers designed for a wide range of applications. These amplifiers are internally frequency compensated for unity gain and offer a large DC voltage gain of 100 dB. They are capable of operating from a single power supply over a wide voltage range of 3 V to 32 V, or from dual supplies of ±1.5 V to ±16 V, making them versatile for various circuit designs.

Key features include a very low supply current drain of 700 μA, essentially independent of the supply voltage, and a wide bandwidth of 1 MHz (temperature compensated). The input common-mode voltage range includes ground, allowing for direct sensing near GND. The large output voltage swing from 0 V to V+ - 1.5 V enhances the operational flexibility of these amplifiers. Additionally, the LM324N is compatible with all forms of logic and is suitable for battery operation due to its low power drain.

Key Specifications and Features

  • Internally frequency compensated for unity gain
  • DC voltage gain: 100 dB
  • Bandwidth: 1 MHz (temperature compensated)
  • Power supply range: 3 V to 32 V (single supply) or ±1.5 V to ±16 V (dual supplies)
  • Supply current drain: 700 μA
  • Input biasing current: 45 nA (temperature compensated)
  • Input offset voltage: 2 mV
  • Differential input voltage range equal to the power supply voltage
  • Large output voltage swing: 0 V to V+ - 1.5 V

LM324N Datasheet

LM324N datasheet (PDF)

LM324N Substitutes
Equivalent alternate parts that may serve as a substitute for LM324N, most popular parts first


  • Transducer amplifiers
  • DC gain blocks
  • Conventional op amp circuits


Operational Amplifiers

General information

Operational amplifiers (op amps) are fundamental building blocks in electronic circuits, known for their versatility and efficiency in processing analog signals. They amplify voltage signals, perform mathematical operations, and can be configured in numerous ways to serve different functions such as filtering, oscillation, and signal conditioning. When selecting an op amp, engineers consider factors such as gain bandwidth, input and output impedance, power supply requirements, and packaging.

The LM324N is a quad operational amplifier, meaning it contains four op amps in a single package, which is beneficial for compact or multi-channel applications. Its ability to operate from a single power supply over a wide range of voltages makes it particularly suitable for battery-powered devices and systems that require minimal power consumption. The internal frequency compensation for unity gain ensures stability across the operational bandwidth without additional external components.

One of the key advantages of the LM324N is its very low supply current drain, which is crucial for battery-operated and portable devices. Its wide bandwidth and large output voltage swing offer flexibility in a broad range of applications, from simple signal amplification to more complex analog processing tasks. The input common-mode voltage range that includes ground allows for direct sensing near GND, simplifying circuit design. When choosing an op amp like the LM324N, engineers must assess the specific requirements of their application, including voltage levels, power consumption, and desired signal processing capabilities.

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