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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

STMicroelectronics LM324ADT

Name: LM324ADT
Brand: STMicroelectronics
SKU: LM324ADT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM324ADT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: LM324ADT.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14SO

Quantity:: RFQ Add To RFQ list

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Inventory:4,598

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Product details

Overview

LM324ADT from STMicroelectronics is a low-power quad operational amplifier in SO14 package, designed for single-supply operation from 3 V to 30 V or dual supplies ±1.5 V to ±15 V. It delivers 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and input common-mode range extending to ground-enabling precision signal conditioning in industrial sensor interfaces and 24 V PLC analog front-ends.

For engineers reviewing the LM324ADT datasheet, LM324ADT pinout, LM324ADT application, or LM324ADT equivalent, key selection criteria include its 3 mV max input offset voltage (25 °C), 375 µA per-amplifier supply current, rail-to-rail output swing capability under 2 kΩ load, and guaranteed operation across 0 °C to 70 °C ambient temperature.

Technical Context

The LM324ADT integrates four independent high-gain op-amps with internal frequency compensation, supporting unity-gain-stable operation without external components. Its PNP input stage enables true ground-sensing input common-mode range (0 V to V_CC − 1.5 V) and low input bias current (20 nA typ).

It features open-collector-compatible output stages capable of sourcing up to 40 mA and sinking ≥10 mA, with output voltage swing within 1.5 V of rails at full load. The device exhibits 80 dB typical CMRR and 110 dB supply voltage rejection ratio at 25 °C, making it suitable for noisy industrial environments where DC accuracy and power supply immunity are critical.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	1.3 MHz - supports stable closed-loop operation up to ~100 kHz at gain = 10
Input Offset Voltage (25 °C)	3 mV max - ensures ≤30 mV error in unity-gain buffer with 10 V input
Supply Current per Amplifier	375 µA - enables 4-channel analog signal path in battery-powered systems with <1.5 mA total quiescent draw
Input Common-Mode Range	0 V to V_CC − 1.5 V - allows direct interfacing with 0–5 V sensors and microcontroller ADC references
Large-Signal Voltage Gain	100 dB - provides ≥100,000× amplification for low-level transducer signals
Output Short-Circuit Duration	Infinite - permits robust fault tolerance in motor driver feedback or actuator control loops
ESD Rating (HBM)	800 V - meets IEC 61000-4-2 Level 2 for industrial board-level ESD immunity

Pinout & Package

LM324ADT is supplied in SO14 (Small Outline 14-pin) package with standard 1.27 mm pitch, 8.75 mm × 4.0 mm body size, and gull-wing leads. The exposed pad is absent-no thermal pad connection required.

Pin/Terminal	Circuit Role	Design Meaning
1	Output A	Amplifier A output; drives loads up to 40 mA source / 20 mA sink
2	Inverting Input A	High-impedance (20 nA bias) differential input node for A channel
3	Non-inverting Input A	Ground-referenced input enabling single-supply sensor buffering
4	V_CC− (GND)	Power return for single-supply operation; connects to system ground plane
5	Non-inverting Input B	Independent input for second amplifier; shares same V_CC− reference
6	Inverting Input B	Differential input for B channel; identical electrical characteristics to Pin 2
7	Output B	Second amplifier output; electrically isolated from Output A
8	V_CC+	Positive supply rail; supports 3–30 V single or ±1.5–±15 V dual operation
9	Output C	Third amplifier output; fully decoupled from other channels
10	Inverting Input C	Input for third op-amp; validated for 0–28.5 V common-mode range at V_CC+ = 30 V
11	Non-inverting Input C	Ground-capable input enabling rail-to-rail input stage in C channel
12	Non-inverting Input D	Fourth amplifier non-inverting input; matches Pins 3, 5, 11 in performance
13	Inverting Input D	Fourth amplifier inverting input; supports same input voltage limits as other channels
14	Output D	Final amplifier output; maintains 1.3 MHz GBW and 100 dB gain at full temperature range

Key Features

Feature	Design Value
Single-supply operation down to 3 V	Enables direct integration with 3.3 V microcontrollers and IoT sensor nodes without level-shifting circuitry
Input common-mode range includes ground	Permits zero-volt referenced signal acquisition from thermocouples, strain gauges, and current-sense shunts
Low input bias current (20 nA typ)	Minimizes voltage error in high-impedance pH probe or photodiode transimpedance amplifier designs
Wide supply range (3–30 V)	Supports unified design across 5 V logic, 12 V industrial buses, and 24 V PLC backplanes
Enhanced ESD rating (800 V HBM)	Reduces need for external TVS protection in factory-floor instrumentation and field-deployed equipment

Applications

Industrial Sensor Signal Conditioning

PLC Analog Input Module

Use Scenario: Amplifying low-level mV outputs from RTD, thermocouple, or pressure transducers in factory automation cabinets.

IC Role / Device Role / Timing Role: Quad op-amp configured as precision instrumentation amplifier (2 amps), buffer (1 amp), and reference voltage follower (1 amp).

Use Value: 3 mV max V_io and 70 dB min CMRR ensure ≤0.1% measurement error over 0–100 °C ambient range.

Use Scenario: Converting 4–20 mA loop currents to 0–5 V or 0–10 V for ADC sampling in programmable logic controllers.

IC Role / Device Role / Timing Role: Four independent transimpedance and level-shifting stages, each handling one analog input channel.

Use Value: 375 µA per amplifier enables 4-channel isolation with <1.5 mA total supply current-critical for fanless DIN-rail enclosures.

DC Motor Speed Feedback

Medical Patient Monitor Front-End

Use Scenario: Conditioning tachometer generator signals and current-sense feedback in closed-loop motor drives.

IC Role / Device Role / Timing Role: One op-amp as differential amplifier for shunt voltage, one as integrator for PI controller, two as comparators for overcurrent detection.

Use Value: Infinite short-circuit duration and 40 mA output drive allow direct interface with optocoupler inputs and relay drivers without external buffers.

Use Scenario: Amplifying ECG electrode signals and filtering respiration transducer outputs in portable patient monitors.

IC Role / Device Role / Timing Role: Three op-amps form 3-pole active filter (LPF + HPF), fourth serves as precision reference buffer for ADC reference voltage.

Use Value: 40 nV/√Hz input noise and 1.3 MHz GBW support clean 0.05–150 Hz biopotential signal acquisition with <5 µV RMS noise floor.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad operational amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM324DT	5 mV max V_io (vs. 3 mV), no enhanced ESD (250 V HBM vs. 800 V)	Suitable for cost-sensitive consumer-grade applications where ±2 mV offset tolerance is acceptable	Select when budget constraints outweigh need for tight DC accuracy or industrial ESD robustness
TSB572IDT	36 V supply range, 0.15 mV V_io, 2.5 MHz GBW, automotive AEC-Q100 qualified	Targeted at automotive body electronics and higher-precision industrial control requiring extended voltage headroom	Choose for next-generation designs needing lower offset drift, higher speed, or automotive qualification

Compared with LM324DT, LM324ADT offers tighter offset and superior ESD immunity at identical price point; versus TSB572IDT, it trades bandwidth and precision for broader legacy compatibility and lower system cost in non-automotive settings.

Availability

LM324ADT is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC analog input modules, and DC motor feedback circuits requiring stable component supply and long-term manufacturing continuity.

Supply support for LM324ADT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for smart driving, power management, and industrial automation.

The LM324x series belongs to ST's general-purpose analog portfolio, engineered specifically for cost-effective, reliable signal conditioning in industrial control, building automation, and test equipment where wide supply range and ground-sensing capability are essential.

FAQ

Is LM324ADT pin-compatible with LM324DT?

Yes-both share identical SO14 pinout, electrical specifications, and functional block diagram. The only differences are guaranteed input offset voltage (3 mV max for ADT vs. 5 mV for DT) and human-body-model ESD rating (800 V vs. 250 V). No PCB redesign is needed when upgrading from DT to ADT.

Can LM324ADT operate from a 3.3 V single supply?

Yes-LM324ADT is fully specified down to 3 V supply. At 3.3 V, it maintains 1.3 MHz gain bandwidth and 100 dB open-loop gain, with output swing reaching within 1.5 V of rails. Input common-mode range extends to ground, enabling direct interface with 3.3 V microcontroller ADC references.

What is the maximum capacitive load LM324ADT can drive without oscillation?

LM324ADT is unity-gain stable into ≥100 pF capacitive loads when properly decoupled with 100 nF ceramic capacitor between V_CC+ and GND near the SO14 package. For loads >500 pF, a 10–100 Ω series resistor should be placed in series with the output to maintain phase margin above 45°.

Does LM324ADT support dual-supply operation with ±5 V rails?

Yes-LM324ADT supports dual supplies from ±1.5 V to ±15 V. With ±5 V rails, it delivers full 100 dB gain, 1.3 MHz bandwidth, and input common-mode range from −3.5 V to +3.5 V. Output swing reaches within 1.5 V of each rail, providing ±3.5 V usable dynamic range for bipolar signal processing.

LM324ADT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: -

Slew Rate:: 0.4V/µs

Gain Bandwidth Product:: 1.3 MHz

-3db Bandwidth:: -

Current - Input Bias:: 20 nA

Voltage - Input Offset:: 2 mV

Current - Supply:: 1.5mA

Current - Output / Channel:: 40 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

LM324ADT FAQ

1.How can I place an order for LM324ADT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM324ADT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LM324ADT reliable?

The price and inventory of LM324ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324ADT is usually 5 days.

3.What payment methods are accepted for LM324ADT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324ADT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM324ADT?

LM324ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM324ADT order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LM324ADT?

For technical support, including LM324ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324ADT requirements.

6.How does Aetrix verify that LM324ADT is sourced from the original manufacturer or authorized distributors?

All LM324ADT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM324ADT meets industry standards.

7.What is the process for return or replacement of LM324ADT?

All LM324ADT units undergo pre-shipment inspection (PSI). If there is an issue with LM324ADT, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LM324ADT part is unused and in its original packaging.

Return procedure for LM324ADT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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