Home Electronics Choosing Between LM339 and LM324 Op-Amps: An In-Depth Comparison

Choosing Between LM339 and LM324 Op-Amps: An In-Depth Comparison

compare lm339 vs lm324

Op-amps, or operational amplifiers, are the unsung heroes of the electronics world, driving countless circuits with precision and reliability. But when it comes to choosing the right one for your project, the options can be overwhelming. In this in-depth comparison, we turn the spotlight on two popular contenders: the LM339 and LM324 op-amps.

This blog will dissect the key differences in voltage range, impedance, speed, and more, empowering you to make an informed decision. Let’s explore the world of op-amps and uncover which one suits your needs best.

LM339 Op-Amp

The LM339 is a versatile and widely-used operational amplifier, belonging to the LMx39 series of quad comparators. Developed initially by Texas Instruments (who are also known for developing  SN74AHCT1G00-Q1 integrated circuit for automotive electronic systems), this component has earned a reputation for its reliability and adaptability in diverse electronic applications.

The LM339 provides four high-speed voltage comparators within a single package, making it an excellent choice for tasks requiring precise voltage comparisons. It boasts a broad voltage supply range, typically ranging from 2 to 36 volts, allowing it to function effectively in both low and high-voltage scenarios. This component’s low input offset voltage and high open-loop gain ensure accurate and dependable signal comparisons, making it indispensable in applications such as limit switches, window detectors, and voltage level sensing.

LM324 Op-Amp

The LM324 operational amplifier, a member of the LMx24 series, is a quad op-amp renowned for its versatility and widespread use in electronics. Developed by Texas Instruments, it has become a fundamental component in various applications.

Notably, the LM324 is characterized by its low input offset voltage and high open-loop gain, ensuring accurate and dependable signal processing. This op-amp is highly effective in audio amplification, voltage followers, active filters, and instrumentation amplifiers, making it a trusted choice for both hobbyists and professionals in the electronics field.

Its low power consumption and reliable performance have solidified its reputation as an indispensable component in electronic circuits and systems, contributing to its enduring popularity in the industry.

Key Specifications and Features Comparison

The LM339 and LM324 are both crucial integrated circuits in the world of electronics, but they serve distinct purposes due to their key differences. Here, we will delve into the primary differentiators between these two components:

Functionality and Configuration

●     LM339: It’s a quad voltage comparator, designed specifically for comparing input voltages and providing digital outputs based on these comparisons. It’s excellent for tasks requiring precise voltage comparisons.

●     LM324: This is a quad operational amplifier. It’s more suitable for tasks involving signal amplification, summing, filtering, and other linear operations.

Voltage Range

●     LM339: Typically operates with a voltage range from 2 to 36 volts, making it adaptable to various voltage scenarios.

●     LM324: Generally operates within a voltage range of 3 to 32 volts, offering similar adaptability but with a slightly narrower range compared to LM339.


●     LM339: Ideal for tasks requiring precise voltage comparisons, such as in limit switches, window detectors, and voltage level sensing.

●     LM324: Suited for applications involving signal processing, audio amplification, voltage followers, active filters, and instrumentation amplifiers.

Speed and Response Time

●     LM339: Typically has a faster response time, suitable for applications requiring rapid voltage comparisons.

●     LM324: May have a slightly slower response time compared to LM339, but it excels in linear signal processing.


●     Choose LM339 for applications requiring precise voltage comparisons.

●  Opt for LM324 when signal processing, amplification, and linear operations are required.

Considerations for Selecting the Right Op-Amp

Selecting the right operational amplifier (op-amp) is crucial for any electronic project. When making this decision, several key considerations come into play. First and foremost, the intended application should dictate the choice, as op-amps are optimized for various purposes. 

It’s essential to evaluate parameters like voltage range, input bias current, gain bandwidth product, and noise characteristics to ensure compatibility with the project’s requirements. Power consumption and supply voltage limitations must also align with the available power source. Temperature range, cost, and environmental conditions are equally vital factors. Lastly, assessing input and output characteristics helps determine if the op-amp will meet precision and performance needs.

Wrapping Up

The choice between LM339 and LM324 op-amps is pivotal in determining the success of an electronic project. Each has its distinct strengths and applications. LM339 excels in precise voltage comparisons, making it invaluable for tasks like limit switches and voltage level sensing.

On the other hand, LM324’s versatility shines in signal processing, amplification, and linear operations, making it a reliable choice in audio electronics, instrumentation amplifiers, and more. Engineers and hobbyists must carefully assess project requirements to select the op-amp that best aligns with their specific needs.

This in-depth comparison equips them with the knowledge needed to make informed decisions, ensuring optimal performance in their electronic designs.