LM324ADR2G Quad Op Amp for Single Supply Analog Circuits

ElecSuppliers Part Number GuideAug 28, 2026

The LM324ADR2G is a specific version of the widely used LM324 family of general purpose operational amplifiers. For engineers searching this exact part number, the important distinction is that LM324ADR2G is not simply a generic LM324 reference. It identifies an onsemi quad operational amplifier in a 14 pin SOIC package with a defined electrical and packaging configuration.

The device combines four independent operational amplifiers in one package and is designed for applications where multiple analog signal processing functions are needed without using four separate ICs.

Its ability to operate from a 3 V to 32 V supply range also makes the LM324 family particularly useful in single-supply analog circuits.

What LM324ADR2G Actually Is

LM324ADR2G is an onsemi LM324 series general purpose quad operational amplifier.

The "quad" designation means that four independent amplifier circuits are integrated inside the same IC.

Instead of placing four individual op amps on a PCB, a designer can use one LM324ADR2G to handle several analog functions.

Typical functions can include voltage amplification, signal conditioning, threshold detection, filtering and buffering.

The device is supplied in a 14-SOIC surface mount package, making it suitable for automated PCB assembly and compact electronic designs.

Why the LM324 Family Is Still Widely Used

The LM324 architecture is particularly recognizable because it was designed around practical single-supply analog applications.

Many older operational amplifier designs assume that positive and negative supply rails are available.

The LM324 family can instead operate from a single positive supply, with the supply range extending from 3 V to 32 V for this onsemi version.

That makes the architecture useful in circuits where generating a separate negative rail would add unnecessary complexity.

For simple analog control circuits, sensor interfaces and voltage monitoring, this can be a significant advantage.

Four Amplifiers in One LM324ADR2G

One of the most useful characteristics of LM324ADR2G is the integration of four independent amplifier channels.

A designer might use one channel for sensor amplification, another for filtering, another for a comparator-like threshold function and another for buffering.

All four functions can share the same IC package and supply rails.

This reduces PCB component count and can simplify the layout compared with using several individual single-channel operational amplifiers.

The four-channel configuration is therefore one of the main reasons to choose an LM324-based device.

LM324ADR2G Supply Voltage

The specified supply range is 3 V to 32 V.

This is an important characteristic when considering the part for a new design.

At the lower end, the device can operate in circuits using relatively low supply voltages.

At the higher end, it can be used in analog control systems where a considerably higher supply rail is available.

The supply voltage should always be considered together with the actual input and output signal ranges.

A wide supply range does not mean that every input signal can automatically swing across the complete supply range.

Single Supply Operation

LM324-type operational amplifiers are particularly associated with single-supply operation.

In a single-supply circuit, the negative rail is normally ground.

This can simplify circuits such as sensor amplifiers and voltage monitoring stages because the designer does not necessarily need a negative power supply.

The common-mode input range includes the negative supply under the specified operating conditions, which is one of the characteristic features of the LM324 architecture.

This makes the device practical for many low-side analog signal measurements.

LM324ADR2G Gain Bandwidth

LM324ADR2G is listed with a 1 MHz gain bandwidth product.

Gain bandwidth is important because an operational amplifier does not maintain the same closed-loop gain at every frequency.

As the required gain increases, the usable signal bandwidth generally decreases.

For low-frequency analog circuits, a 1 MHz gain bandwidth product can be sufficient for many applications.

The device is therefore better suited to general-purpose analog signal conditioning than to high-speed amplification.

Slew Rate of LM324ADR2G

The typical slew rate is listed as approximately 0.6 V/µs.

Slew rate describes how quickly the output voltage can change.

For a slowly varying sensor signal, this characteristic may have little practical impact.

For faster waveforms or large-amplitude signals, however, the slew rate can become a limiting factor.

This is an important reason why LM324ADR2G should not automatically be substituted for a modern high-speed operational amplifier simply because the pin count appears similar.

LM324ADR2G Package

The exact package is an important part of the LM324ADR2G identity.

It uses a 14-SOIC package, with surface mount PCB installation.

This distinguishes it from other LM324 variants that may use through-hole packages or different surface mount configurations.

For a new PCB, the SOIC footprint needs to be incorporated into the layout.

For an existing design, package compatibility becomes especially important when selecting a replacement.

A replacement with identical electrical characteristics but a different physical package may still require PCB changes.

LM324ADR2G and the LM324 Part Number Family

Searching for LM324 can produce many different results.

This is because LM324 is a broad product family rather than a single physical configuration.

Different manufacturers and product generations can have different electrical specifications, packages and ordering codes.

LM324ADR2G identifies a specific onsemi ordering configuration.

Therefore, engineers working from a BOM should use the complete LM324ADR2G designation when sourcing the original component.

This is especially important when a project has already been qualified around a particular package and electrical version.

LM324ADR2G Input Characteristics

Operational amplifier input characteristics determine how the device interacts with the signal source.

LM324ADR2G is designed as a general-purpose bipolar operational amplifier and has input bias current and input offset voltage characteristics that need to be considered in precision circuits.

For applications such as basic voltage amplification, threshold detection and signal buffering, these characteristics may be entirely acceptable.

For very high precision measurement systems, however, a dedicated precision op amp may be more appropriate.

This is one of the most important distinctions between a general-purpose LM324 device and specialized modern analog amplifiers.

LM324ADR2G Output Capability

The device is specified with an output current capability of approximately 40 mA per channel in distributor specifications.

This does not mean the operational amplifier should be treated as a general-purpose power driver.

An op amp output normally drives another circuit stage rather than a large load directly.

The actual output voltage and current capability also depend on operating conditions.

For loads requiring significant current, an external transistor, MOSFET or dedicated driver may be needed.

Common Applications for LM324ADR2G

The combination of four amplifier channels, single-supply operation and a wide supply range gives LM324ADR2G a broad range of practical applications.

It can be considered for:

Sensor signal conditioning

Voltage amplification

Low-frequency active filters

Signal buffering

Threshold detection

Control circuits

Battery monitoring

Industrial analog interfaces

General-purpose analog processing

The suitability of the device depends on signal frequency, required precision, supply voltage and output requirements.

LM324ADR2G for Sensor Signal Conditioning

Sensor signals are often relatively small and need to be amplified or conditioned before reaching an ADC or control circuit.

One LM324ADR2G provides four amplifier channels, allowing several stages of signal conditioning to be implemented in a single IC.

For example, one channel can amplify a sensor output while another can provide filtering or buffering.

This makes the device attractive for systems where analog circuitry is relatively slow and cost and component count are important considerations.

LM324ADR2G for Active Filters

An operational amplifier can be combined with resistors and capacitors to create active filters.

The LM324 architecture is commonly used in low-frequency filtering because its speed is appropriate for many slow analog signals.

The exact filter frequency depends on the external resistor and capacitor network.

The 1 MHz gain bandwidth product should nevertheless be considered when designing higher-frequency filters.

LM324ADR2G for Voltage Monitoring

Voltage monitoring is another natural application.

An LM324 channel can compare or amplify a monitored voltage before the signal is passed to another circuit.

Because the device supports single-supply operation, it can be convenient in systems where the monitored signal is referenced to ground.

The four available channels can also allow several voltage rails or analog signals to be monitored with one IC.

What Makes LM324ADR2G Different From a Generic LM324

This is an important question for anyone searching the exact MPN.

"LM324" identifies the broader amplifier family.

"LM324ADR2G" identifies a specific onsemi part configuration.

The complete part number provides information about the manufacturer-specific implementation and package/order configuration.

This means a generic LM324 search is useful for understanding the amplifier family, but it is not enough when the goal is to source an exact BOM component.

For production purchasing, the complete MPN should remain the primary search term.

LM324ADR2G Replacement Options

A replacement for LM324ADR2G should not be selected only because it contains four operational amplifiers.

The following characteristics should be compared:

Supply voltage range

Number of channels

Input common-mode range

Input offset voltage

Input bias current

Gain bandwidth

Slew rate

Output capability

Package

Pin configuration

Operating temperature

A device with a newer architecture may provide better electrical performance, but it may not be a drop-in replacement.

The PCB footprint and pinout must be checked before approving a substitute.

LM324ADR2G Versus Other LM324 Versions

The LM324 family includes multiple ordering variants.

Differences can involve package type, manufacturer, temperature range, packaging method and electrical specifications.

For example, an LM324 in a through-hole package cannot simply replace a 14-SOIC device on an existing surface mount PCB without modification.

Even when two parts share the LM324 base designation, the complete MPN should be checked.

This is why LM324ADR2G is a more useful sourcing keyword than simply "LM324 op amp."

What Engineers Should Check Before Using LM324ADR2G

Start with the power supply.

Confirm that the circuit operates within the 3 V to 32 V supply range.

Then examine the input signal range.

After that, determine the required gain and signal frequency.

For faster signals, gain bandwidth and slew rate become increasingly important.

For precision applications, input offset voltage and bias current should also be evaluated.

Finally, confirm that the 14-SOIC package and pin configuration fit the PCB design.

What Buyers Should Check When Sourcing LM324ADR2G

When the exact part is specified in a BOM, search for LM324ADR2G rather than only LM324.

Confirm that the manufacturer is onsemi and that the package is the required 14-SOIC configuration.

Packaging should also be checked because the same MPN can be offered through different purchasing formats such as tape and reel or cut tape depending on the distributor.

For production quantities, buyers should additionally verify date code, traceability, packaging condition and supplier authorization where applicable.

Finding LM324ADR2G Suppliers

For buyers already working with the exact MPN, ElecSuppliers can be used as a starting point for finding electronic component suppliers associated with the part number.

Searching the complete LM324ADR2G designation helps distinguish the onsemi SOIC version from other LM324 family products.

This is particularly useful when a purchasing team needs supplier options for an existing BOM rather than a generic replacement.

LM324ADR2G in Practical Analog Design

LM324ADR2G remains relevant because it combines several useful characteristics in one inexpensive general-purpose device: four amplifier channels, single-supply operation and a broad 3 V to 32 V supply range.

Its limitations are equally important to understand.

The 1 MHz gain bandwidth and approximately 0.6 V/µs slew rate make it much more appropriate for general-purpose and relatively low-frequency analog circuits than for high-speed signal processing.

For engineers searching LM324ADR2G, the key is therefore not simply recognizing it as an LM324. The complete part number identifies a specific onsemi four-channel SOIC device whose electrical characteristics, package and application range need to match the actual design.

For procurement teams, preserving the complete LM324ADR2G MPN is equally important when comparing supplier availability or evaluating an alternative component.