STMicroelectronics

LM324DT - Quad Operational Amplifier | STMicroelectronics

Name: LM324DT
Brand: STMicroelectronics
Price: 0.35 USD
Availability: InStock

MPN: LM324DT ✓ Active

In Stock (99,999) Ships in 1-3 business days

3 V to 32 V Vdss 700 µA typical Id SOIC-14 Package

$0.35 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$0.35	$0.35
10	$0.3	$3.00
100	$0.25	$25.00
500	$0.2	$100.00
1,000	$0.18	$180.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for LM324DT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

LM324DR

✅ Drop-In

📦 SOIC-14

Same SOIC-14 package, pin-to-pin compatible, similar electrical specs

📋 Reference alternative (not in catalog)

LM324ADT

✅ Drop-In

📦 SOIC-14

Same SOIC-14 package, lower input offset voltage (1mV typical)

📋 Reference alternative (not in catalog)

LM2902DT

✅ Drop-In

📦 SOIC-14

Same SOIC-14 package, wider temperature range (-40°C to +125°C)

📋 Reference alternative (not in catalog)

LM324DT Maximum Ratings & Electrical Characteristics

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

LM324DT Pin Configuration

Pin 1	1OUT — Output of amplifier 1
Pin 2	1IN- — Inverting input of amplifier 1
Pin 3	1IN+ — Non-inverting input of amplifier 1
Pin 4	VCC — Positive power supply
Pin 5	2IN+ — Non-inverting input of amplifier 2
Pin 6	2IN- — Inverting input of amplifier 2
Pin 7	2OUT — Output of amplifier 2
Pin 8	3OUT — Output of amplifier 3
Pin 9	3IN- — Inverting input of amplifier 3
Pin 10	3IN+ — Non-inverting input of amplifier 3
Pin 11	GND — Ground (negative supply)
Pin 12	4IN+ — Non-inverting input of amplifier 4
Pin 13	4IN- — Inverting input of amplifier 4
Pin 14	4OUT — Output of amplifier 4

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

LM324DT is suitable for 6 applications: Transducer Amplifier, DC Gain Block, Active Filter, Signal Conditioning, Battery-Powered Devices, Automotive Sensor Interface.

🔧

Transducer Amplifier

The LM324DT is ideal for amplifying signals from sensors such as thermocouples, strain gauges, and photodiodes. Its low input bias current (20nA) minimizes loading on high-impedance sensors, and the wide supply range allows direct connection to industrial 24V rails. In a typical configuration, the op-amp is used in a non-inverting or instrumentation amplifier topology to condition the small sensor signal to a level suitable for an ADC. The common-mode input range includes ground, enabling single-supply operation with sensors referenced to ground. For best accuracy, use precision resistors in the feedback network and consider the input offset voltage (2mV typical) in calibration. The LM324DT's low cost and quad configuration make it economical for multi-channel sensor interfaces.

Recommended

LM4040 (Voltage reference for ADC) ADS1115 (ADC for sensor signal digitization)

🔧

DC Gain Block

The LM324DT can be used as a DC gain block to amplify small DC voltages, such as from a shunt resistor or a potentiometer. With a gain-bandwidth product of 1.3MHz, it provides stable gain up to a few hundred kHz. In a non-inverting configuration, the gain is set by two resistors, and the output can drive up to 40mA. The low supply current (700µA per amplifier) makes it suitable for battery-powered instruments. For DC precision, the input offset voltage (2mV typical) may require calibration, and the input bias current (20nA) should be considered when using high-value source resistances. The LM324DT's quad configuration allows multiple gain stages in one package, saving board space.

Recommended

MCP4921 (DAC for offset adjustment) INA128 (Instrumentation amplifier for precision)

🎧

Active Filter

The LM324DT is well-suited for active filters, such as low-pass, high-pass, and band-pass filters, in audio and instrumentation applications. Its 1.3MHz gain-bandwidth product allows filter cutoff frequencies up to a few hundred kHz. The quad configuration enables multi-stage filters, such as a 4th-order Butterworth filter, in a single package. When designing active filters, use the Sallen-Key or multiple-feedback topology with precision resistors and capacitors. The LM324DT's output can swing close to the positive rail but not to ground, so ensure the filter's output range is within the linear region. The low supply current and wide supply range make it suitable for portable and industrial filter applications.

Recommended

PCM1808 (Audio ADC for filter output) TL072 (Higher-performance op-amp for audio)

🏭

Signal Conditioning

The LM324DT is commonly used for signal conditioning in industrial and automotive systems, such as conditioning signals from temperature sensors, pressure sensors, and current shunts. Its wide supply range (3V to 32V) allows direct operation from automotive battery voltages, and the common-mode input range includes ground, enabling single-supply operation. In a typical application, the op-amp is configured as a differential amplifier to reject common-mode noise, or as a buffer to isolate a high-impedance source. The low input bias current (20nA) minimizes errors when interfacing with high-impedance sensors. The quad configuration allows multiple conditioning channels in one package, reducing component count and cost.

Recommended

LM35 (Temperature sensor) ACS712 (Current sensor)

📱

Battery-Powered Devices

The LM324DT's low supply current (700µA per amplifier) and wide supply voltage range (3V to 32V) make it suitable for battery-powered devices, such as portable instruments, remote sensors, and consumer electronics. It can operate directly from a 3V lithium cell or a 9V battery, and the quad configuration provides multiple amplification channels without excessive power drain. In a typical application, the op-amp is used to condition sensor signals before digitization by a microcontroller's ADC. The output can drive small loads, such as LEDs or buzzers, directly. For extended battery life, consider using the shutdown feature of more advanced op-amps, but the LM324DT's simplicity and low cost make it a practical choice for many designs.

Recommended

MSP430G2553 (Low-power microcontroller) TP4056 (Battery charger)

🚗

Automotive Sensor Interface

The LM324DT can be used in automotive sensor interfaces, such as for engine coolant temperature, oil pressure, and throttle position sensors. Its wide supply range (up to 32V) allows direct connection to the vehicle's 12V or 24V electrical system, and the common-mode input range includes ground, enabling single-supply operation. In a typical application, the op-amp conditions the sensor signal to a 0-5V range for the engine control unit (ECU). The low input bias current (20nA) minimizes loading on high-impedance sensors. However, for automotive applications with extended temperature ranges (-40°C to +125°C), consider the LM2902DT, which is a drop-in replacement with a wider temperature rating.

Recommended

LM2902DT (Wider temperature range alternative) TPS7A1601 (LDO for stable supply)

Recommended Products Summary

LM4040 Voltage reference for ADC Used in: Transducer Amplifier ADS1115 ADC for sensor signal digitization Used in: Transducer Amplifier MCP4921 DAC for offset adjustment Used in: DC Gain Block INA128 Instrumentation amplifier for precision Used in: DC Gain Block PCM1808 Audio ADC for filter output Used in: Active Filter TL072 Higher-performance op-amp for audio Used in: Active Filter LM35 Temperature sensor Used in: Signal Conditioning ACS712 Current sensor Used in: Signal Conditioning MSP430G2553 Low-power microcontroller Used in: Battery-Powered Devices TP4056 Battery charger Used in: Battery-Powered Devices LM2902DT Wider temperature range alternative Used in: Automotive Sensor Interface TPS7A1601 LDO for stable supply Used in: Automotive Sensor Interface

What is the supply voltage range of LM324DT?

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.

What is the output current capability of LM324DT?

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.

Is LM324DT suitable for single-supply operation?

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.

What is the gain-bandwidth product of LM324DT?

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.

What is the input offset voltage of LM324DT?

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.

Can LM324DT operate with dual supplies?

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.

What is the quiescent current of LM324DT?

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.

What is the difference between LM324DT and LM324N?

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.

What is the best drop-in replacement for LM324DT?

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.

Where can I buy LM324DT online?

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.

What is the price of LM324DT?

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.

What is the lead time for LM324DT?

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.

Is LM324DT in stock?

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.

LM324DT vs LM358DT - which is better for low-power applications?

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.

When should I choose LM324DT over LM2902DT?

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.

Where can I download the LM324DT datasheet PDF?

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.

Where can I find the LM324DT pinout?

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.

What is the common-mode input voltage range of LM324DT?

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.

Is LM324DT RoHS compliant?

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.

Can LM324DT be used in automotive applications?

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.

Engineering reference data for LM324DT — comparison, design guidance, and compliance information.

Selection Guide

Choose the LM324DT for general-purpose analog applications that require four op-amps in a compact SOIC-14 package, operating from a single supply up to 32V, in commercial temperature environments (0°C to +70°C). If you need lower input offset voltage for precision DC measurements, select the LM324ADT, which offers 1mV typical offset. For automotive or industrial applications with extended temperature ranges, choose the LM2902DT, which is a drop-in replacement with -40°C to +125°C operation. If you only need two op-amps, consider the LM358DT to save cost and space. All alternatives share the same SOIC-14 package and pinout, allowing PCB layout reuse without modification.

Comparison with Alternatives

Parameter	This Product	LM324DR	LM324ADT	LM2902DT
Package	SOIC-14	SOIC-14	SOIC-14	SOIC-14
Supply Voltage Range	3V to 32V	3V to 32V	3V to 32V	3V to 26V
Input Offset Voltage (typical)	2mV	2mV	1mV	2mV
Input Bias Current (typical)	20nA	20nA	20nA	20nA
Gain-Bandwidth Product	1.3MHz	1.3MHz	1.3MHz	1.3MHz
Operating Temperature Range	0°C to +70°C	0°C to +70°C	0°C to +70°C	-40°C to +125°C
Quiescent Current (per amplifier)	700µA	700µA	700µA	700µA
Output Current	40mA	40mA	40mA	40mA

Key Differentiators

Lower input offset voltage option (vs LM324DR)
Wider temperature range option (vs LM324DT)
Quad configuration in SOIC-14 (vs LM358DT (dual))

Design Notes

Decouple the VCC pin (pin 4) with a 0.1µF ceramic capacitor placed as close to the pin as possible, and optionally a 10µF electrolytic capacitor for low-frequency decoupling. The LM324DT can operate from 3V to 32V, but ensure the supply is stable and within the absolute maximum ratings to avoid damage.

For best performance, use a ground plane and keep the input traces short and shielded from noisy signals. The LM324DT has a common-mode input range that includes ground, but avoid routing input traces near high-current switching traces to minimize noise coupling. Place the feedback resistors close to the op-amp to reduce parasitic capacitance.

The LM324DT output cannot swing to the negative rail (ground) when using a single supply; it can only go down to about 20mV above ground. If you need to measure signals near ground, use a pull-down resistor on the output or a rail-to-rail op-amp. Also, avoid exceeding the input common-mode range, which is from ground to VCC - 1.5V, to prevent phase reversal.