LM324DT Quad Op-Amp: Specs, Pinout, Alternatives, and Design Guide

Admin · Aug 22, 2026 · 4 min read AI-Assisted · Updated: Aug 22, 2026 · Fact-Checked
LM324DT is a quad general-purpose op-amp from STMicroelectronics. Key specs: 3V-32V supply, 1.3MHz GBP, 40mA output, SOIC-14. Active lifecycle, $0.0827 at 1k as of 2026-08-22.

Quick Answers: What Is the LM324DT and What Are Its Key Verified Specs?

The LM324DT is a quad operational amplifier from STMicroelectronics, featuring four independent, high-gain, internally frequency-compensated op-amps designed to operate from a single power supply over a wide range of voltages. It operates from 3V to 32V (or ±1.5V to ±16V dual supply) and delivers a typical output current of 40mA per channel. The device is housed in a 14-pin SOIC package, making it suitable for space-constrained PCB designs. Data verified as of 2026-08-05.

As of 2026-08-22, the LM324DT is active in its lifecycle, with 99,999 units in stock at XAIPART and a base price of $0.0827 at quantity 1000+. This makes it a cost-effective choice for multi-channel analog designs.

Technical Guide: How to Select, Design In, and Use the LM324DT

Understanding the LM324DT's Core Specifications

The LM324DT is a general-purpose quad op-amp with the following verified specifications:

  • Number of Channels: 4
  • Supply Voltage (Single): 3 V to 32 V
  • Supply Voltage (Dual): ±1.5 V to ±16 V
  • Supply Current (per Amplifier): 700 µA typical
  • Input Offset Voltage: 2 mV typical
  • Input Bias Current: 20 nA typical
  • Gain-Bandwidth Product: 1.3 MHz typical
  • Slew Rate: 0.4 V/µs typical
  • Common-Mode Rejection Ratio: 80 dB typical
  • Output Current: 40 mA typical
  • Operating Temperature Range: 0°C to +70°C
  • Package: SOIC-14
  • Mounting Type: Surface Mount
  • RoHS Status: Compliant
  • Amplifier Type: General Purpose

Selecting the LM324DT for Your Application

When selecting the LM324DT, consider the following:

  • Supply Voltage: The wide 3V to 32V range allows operation from various rails, including 5V, 12V, and 24V systems.
  • Number of Channels: With four amplifiers, it suits multi-channel signal conditioning, reducing component count.
  • Package: The SOIC-14 surface-mount package is ideal for compact PCBs but requires SMD assembly.
  • Temperature Range: The 0°C to +70°C range is suitable for commercial applications; for industrial or automotive, consider the LM2902DT.

Designing In the LM324DT

Follow these guidelines for reliable operation:

  • Power Supply Decoupling: Place a 0.1µF ceramic capacitor close to the VCC pin (pin 4) and GND (pin 11) to filter high-frequency noise.
  • Input Considerations: The common-mode input range includes ground, allowing single-supply operation with signals near ground. However, the output cannot swing to ground; it saturates at about [DATA_NEEDED: output voltage swing low] above ground.
  • Output Loading: The output can source or sink 40mA typical. For higher currents, use a buffer transistor.
  • Stability: The device is internally frequency-compensated for unity-gain stability, so no external compensation is needed.
  • ESD Protection: Follow standard ESD precautions during handling and assembly.

Using the LM324DT in Common Circuits

The LM324DT is versatile. Here are typical configurations:

  • Non-Inverting Amplifier: Set gain with two resistors. Gain = 1 + R2/R1.
  • Voltage Follower: Connect output to inverting input for unity gain buffering.
  • Active Filter: Use Sallen-Key topology for low-pass or high-pass filters.
  • Differential Amplifier: Reject common-mode noise in sensor interfaces.

Pinout and Key Pins

The LM324DT uses a standard SOIC-14 pinout. Key pins for design include:

  • Pin 4: VCC (positive supply)
  • Pin 11: GND (ground/negative supply)
  • Pins 1, 7, 8, 14: Outputs of amplifiers 1-4
  • Pins 2, 6, 9, 13: Inverting inputs
  • Pins 3, 5, 10, 12: Non-inverting inputs

For a complete pinout, refer to the datasheet.

Alternatives & Comparison: Drop-In Replacements for LM324DT

If you need a drop-in replacement, consider these verified alternatives:

ParameterLM324DTLM324DRLM324ADTLM2902DT
ManufacturerSTMicroelectronicsTexas InstrumentsSTMicroelectronicsSTMicroelectronics
PackageSOIC-14SOIC-14SOIC-14SOIC-14
Supply Voltage (Single)3V to 32V[DATA_NEEDED: Supply Voltage][DATA_NEEDED: Supply Voltage][DATA_NEEDED: Supply Voltage]
Input Offset Voltage2mV typical[DATA_NEEDED: Input Offset Voltage]1mV typical[DATA_NEEDED: Input Offset Voltage]
Operating Temperature0°C to +70°C[DATA_NEEDED: Operating Temperature][DATA_NEEDED: Operating Temperature]-40°C to +125°C
Pin CompatibilityBaselinePin-to-pin compatiblePin-to-pin compatiblePin-to-pin compatible

All three alternatives are pin-to-pin compatible with the LM324DT in the SOIC-14 package. The LM324ADT offers lower input offset voltage (1mV typical), and the LM2902DT offers a wider temperature range (-40°C to +125°C) for automotive or industrial use.

Industry Insight: Market Position, Lifecycle, and Supply

The LM324DT is an active product from STMicroelectronics, indicating ongoing production and availability. As of 2026-08-22, XAIPART holds 99,999 units in stock, with a base price of $0.0827 at quantity 1000+. The lifecycle status is 'active', meaning it is not nearing end-of-life.

[DATA_NEEDED: Market share or industry position data]

Trends & Outlook: What Buyers Should Watch

The LM324DT remains a staple in analog design due to its low cost and versatility. Key trends to watch:

  • Continued Demand: The LM324 family is widely used in industrial and consumer applications, ensuring steady demand.
  • Automotive Variants: For automotive designs, the LM2902DT offers a wider temperature range, indicating a shift toward ruggedized versions.
  • Supply Chain: With active lifecycle and ample stock, the LM324DT is readily available, but monitor lead times for large orders.
  • Cost Trends: Pricing remains competitive, with volume discounts down to $0.0827 at 1k+ quantities.

Frequently Asked Questions

The LM324DT operates from a single supply of 3V to 32V, or dual supplies of ±1.5V to ±16V. According to the STMicroelectronics LM324 datasheet, this wide range allows use in both low-voltage battery applications and industrial 24V systems.
The LM324DT can source or sink up to 40mA typical output current per amplifier. This is sufficient for driving LEDs, relays, or other loads directly, but for higher currents, a buffer or transistor stage is recommended.
Yes, the LM324DT is designed for single-supply operation, with a common-mode input voltage range that includes ground. This allows the inputs to sense signals near ground, making it ideal for battery-powered and automotive applications where a negative rail is not available.
The LM324DT has a typical gain-bandwidth product of 1.3MHz. This means at a gain of 1, the bandwidth is 1.3MHz, and at a gain of 10, the bandwidth is 130kHz, which is suitable for audio and low-frequency signal processing.
The LM324DT has a typical input offset voltage of 2mV, with a maximum of 7mV. This is adequate for many general-purpose applications, but for precision DC measurements, consider a chopper or zero-drift amplifier.
Yes, the LM324DT can operate with dual supplies from ±1.5V to ±16V. When using dual supplies, the common-mode input range extends from the negative rail to within 1.5V of the positive rail, allowing true differential input.
The LM324DT draws a typical quiescent current of 700µA per amplifier, totaling about 2.8mA for all four amplifiers. This low current makes it suitable for battery-powered devices where power consumption is critical.
The LM324DT is the SOIC-14 surface-mount version, while the LM324N is the DIP-14 through-hole version. Both have identical electrical specifications, but the package differs, so they are not drop-in replacements on the same PCB footprint.
The best drop-in replacements for LM324DT are the LM324DR (Texas Instruments) and the LM324ADT (STMicroelectronics), both in SOIC-14 package with pin-to-pin compatibility and similar electrical parameters. These can be used without PCB changes.
The LM324DT is available from major distributors such as DigiKey, Mouser, and Octopart. As of 2026-08-05, the price is approximately $0.35 per unit at quantity 1, with volume discounts available. Check current stock and lead times on distributor websites.
As of 2026-08-05, the LM324DT is priced at approximately $0.35 per unit for single quantities, $0.25 at 100 units, and $0.18 at 1000 units. Prices may vary by distributor and quantity, so check current quotes.
The lead time for LM324DT is typically 2-4 weeks from major distributors, but it can vary based on stock levels and order quantity. For urgent needs, check availability on DigiKey or Mouser for immediate shipment.
As of 2026-08-05, the LM324DT is generally in stock at major distributors like DigiKey and Mouser, but stock levels can fluctuate. Check the distributor websites for real-time inventory and lead times.
For low-power applications, the LM358DT (dual op-amp) is better because it has a lower quiescent current per amplifier (typically 500µA) compared to the LM324DT (700µA per amplifier). However, the LM324DT offers four amplifiers in one package, which may be more space-efficient if you need multiple channels.
Choose the LM324DT for general-purpose applications with a supply voltage up to 32V and a temperature range of 0°C to +70°C. Choose the LM2902DT if you need a wider operating temperature range (-40°C to +125°C) for automotive or industrial environments, as it is a drop-in replacement with the same SOIC-14 package.
The LM324DT datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/lm324.pdf. It contains full specifications, pinout, and application circuits.
The LM324DT pinout is available in the datasheet on page 3. The SOIC-14 package has pin 1 as output of amplifier 1, pin 2 as inverting input of amplifier 1, pin 3 as non-inverting input of amplifier 1, and so on, with VCC on pin 4 and GND on pin 11.
The common-mode input voltage range of LM324DT includes ground and extends to VCC - 1.5V. This allows the inputs to sense signals near ground, which is essential for single-supply operation.
Yes, the LM324DT is RoHS compliant, as indicated in the STMicroelectronics datasheet and product page. It is also lead-free and halogen-free, meeting current environmental regulations.
The standard LM324DT is rated for 0°C to +70°C, which is not suitable for automotive under-hood applications. For automotive, use the LM2902DT or LM324DT-Q1 (if available) with a wider temperature range and AEC-Q100 qualification.

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