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

STMicroelectronics LM324DT

Name: LM324DT
Brand: STMicroelectronics
SKU: LM324DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM324DT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM324DT.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14SO

Quantity:: RFQ Add To RFQ list

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Inventory:5,753

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Product details

Overview

LM324DT from STMicroelectronics is a quad low-power 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 direct interfacing with sensors and microcontrollers in industrial monitoring and automotive body electronics.

For engineers reviewing the LM324DT datasheet, LM324DT pinout, LM324DT application, or LM324DT equivalent, key selection criteria include its 375 µA/amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (LM324A variant), rail-to-rail output capability under load, and robust ESD rating (250 V HBM) in the standard SO14 footprint.

Technical Context

The LM324DT implements internally compensated voltage-feedback op-amp architecture across four independent channels, with frequency compensation optimized for unity-gain stability in single-supply configurations. Its input stage uses PNP transistors enabling true ground-sensing common-mode operation and low input bias current.

Output stage supports sourcing up to 40 mA and sinking up to 20 mA per channel, with output swing within 1.5 V of positive rail and 20 mV of ground at RL = 10 kΩ. Thermal resistance (R_thJA) is 103 °C/W for SO14, limiting continuous dissipation to ~400 mW at ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	1.3 MHz - sets usable small-signal bandwidth for closed-loop gains ≤100 at DC–10 kHz precision sensing
Input Offset Voltage (max)	5 mV @ 25 °C - defines worst-case DC error in precision DC amplification (e.g., sensor signal conditioning)
Supply Current / Amplifier	375 µA - enables battery-powered operation for >1-year runtime in 10 µA-quiescent systems with duty cycling
Input Bias Current	20 nA - minimizes voltage error across high-impedance sources (e.g., pH electrodes, photodiodes)
Common-Mode Input Range	0 V to V_CC − 1.5 V - allows direct connection to 0 V-referenced transducers without level-shifting circuitry
Output Voltage Swing	26 V high / 20 mV low @ V_CC = 30 V, R_L = 10 kΩ - supports wide dynamic range in 24 V industrial control I/O stages
Slew Rate	0.4 V/µs - limits full-power bandwidth to ~320 kHz, sufficient for motor control feedback but not RF

Pinout & Package

LM324DT is supplied in SO14 (Small Outline 14-pin) package, 8.75 mm × 4.0 mm body, 1.27 mm pitch, with gull-wing leads and exposed pad not present. Pin 1 is marked by notch or dot; device orientation follows JEDEC MS-012.

Pin	Circuit Role	Design Meaning
1	Inverting input (AMP1)	Accepts inverted-phase signal; high-impedance node sensitive to PCB leakage & layout parasitics
2	Non-inverting input (AMP1)	Accepts non-inverted signal; referenced to system ground in single-supply configs
3	Output (AMP1)	Class-AB push-pull output capable of sourcing/sinking ≥20 mA into 10 kΩ load
4	V_CC− (GND)	Ground reference for all four amplifiers; must be low-impedance return path for output currents
5	Inverting input (AMP2)	Independent channel input; shares no internal nodes with AMP1-enables multi-channel filtering
6	Non-inverting input (AMP2)	Isolated input node; routing separation from AMP1 inputs prevents crosstalk in mixed-signal PCBs
7	Output (AMP2)	Dedicated output; thermal coupling to AMP1 output is minimal due to die layout
8	Output (AMP3)	Third independent output; pin location avoids adjacent power/ground pins to reduce noise coupling
9	Non-inverting input (AMP3)	High-Z input; requires guard ring if used with >1 MΩ source impedance
10	Inverting input (AMP3)	Inverts signal relative to AMP3 non-inverting input; matched to pin 5 for balanced design
11	V_CC+	Positive supply rail; decoupling capacitor (100 nF ceramic) required within 5 mm of this pin
12	Inverting input (AMP4)	Final channel inverting input; pin placement allows star grounding with V_CC+ and GND
13	Non-inverting input (AMP4)	Enables fourth independent gain stage; identical electrical specs to pins 1–2 and 5–6
14	Output (AMP4)	Provides fourth buffered output; total quiescent current remains stable regardless of output loading

Key Features

Feature	Design Value
Single-supply operation down to 3 V	Eliminates need for split-rail supplies in portable instrumentation and 3.3 V MCU interfaces
Input common-mode range includes ground	Permits direct connection to 0 V-referenced sensors (e.g., thermocouples, strain gauges) without external biasing
Low input bias current (20 nA typ.)	Reduces voltage error across high-value feedback networks (>100 kΩ), preserving gain accuracy
Wide supply range (3–30 V single / ±1.5–±15 V dual)	Supports reuse across 5 V logic, 12 V automotive, and 24 V industrial platforms without redesign
Internal frequency compensation	Guarantees stability with unity-gain configuration and capacitive loads ≤100 pF without external compensation

Applications

Industrial Sensor Signal Conditioning

Automotive Body Control Module (BCM)

Use Scenario: Amplifying low-level analog outputs from RTD, thermistor, or pressure transducers in PLC analog input modules.

IC Role / Device Role: Quad op-amp configured as precision instrumentation amplifier front-end and anti-alias filter driver.

Use Value: 5 mV max V_os and 20 nA I_ib minimize zero-point drift and gain error over 0–70 °C operating range.

Use Scenario: Level-shifting and buffering signals between 5 V MCU GPIOs and 12 V solenoid drivers or lamp dimming circuits.

IC Role / Device Role: Voltage follower and comparator hysteresis generator for window detection on door lock status lines.

Use Value: Rail-to-rail output swing and 30 V absolute max supply enable direct interface with automotive battery rails without clamping diodes.

Consumer Appliance Power Supply Monitoring

Medical Patient Monitor Front-End

Use Scenario: Monitoring DC bus voltage and current sense signals in switched-mode power supplies for refrigerators and washing machines.

IC Role / Device Role: Summing amplifier for current shunt + voltage divider scaling, feeding ADC input of appliance SoC.

Use Value: 1.3 MHz GBW ensures accurate capture of ripple harmonics up to 100 kHz; 375 µA/quiescent current extends standby battery life.

Use Scenario: Amplifying ECG electrode signals and filtering EMG noise in portable patient monitors.

IC Role / Device Role: First-stage differential amplifier (gain = 10) followed by active low-pass filter (fc = 150 Hz).

Use Value: 100 dB open-loop gain maintains CMRR > 80 dB with 0.1% resistor matching; low 40 nV/√Hz input noise preserves SNR in sub-µV biopotential signals.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad op-amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM324ADT	Enhanced V_os spec: 3 mV max vs. 5 mV for LM324DT; same SO14 package and pinout	Better DC accuracy for precision DC-coupled amplifiers (e.g., weigh scale load cell interfaces)	Select when V_os drift < 3 mV is mandatory; cost premium justified for metrology-grade designs
TSB572IDT	36 V supply rating, 1.8 MHz GBW, 120 µA/amplifier, AEC-Q100 qualified	Automotive-grade replacement with lower power, higher speed, and extended temp range (−40 to 125 °C)	Choose for new automotive designs requiring functional safety compliance and reduced board space

Compared with LM324DT, LM324ADT improves DC precision at identical cost and footprint, while TSB572IDT offers automotive qualification and 2× bandwidth at lower quiescent current - making it suitable for next-generation vehicle ECUs where legacy LM324DT remains viable for cost-sensitive industrial use.

Availability

LM324DT is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, consumer appliance power monitoring, and medical front-end signal conditioning requiring stable component supply across long-lifecycle programs.

Supply support for LM324DT 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 microcontrollers since 1987.

The LM324x series belongs to ST's general-purpose analog op-amp product line, engineered for cost-effective, reliable performance in industrial automation, automotive subsystems, and consumer electronics where robustness and broad supply voltage tolerance are critical.

FAQ

What is the maximum operating temperature for LM324DT?

The LM324DT is rated for 0 °C to +70 °C ambient operating temperature, consistent with its commercial-grade classification. Junction temperature must remain ≤150 °C; with R_thJA = 103 °C/W and 1.2 mA total supply current at 30 V, derating begins above ~55 °C ambient in still air without heatsinking.

Can LM324DT drive a 2 kΩ load at 30 V supply?

Yes - LM324DT can source up to 40 mA and sink up to 20 mA per channel. At V_CC = 30 V and R_L = 2 kΩ, output current is ~15 mA, well within safe limits. Output high voltage reaches 26 V and low voltage drops to 20 mV, meeting datasheet specifications under these conditions.

Does LM324DT require external compensation capacitors?

No - LM324DT features internal frequency compensation optimized for unity-gain stability. It remains stable driving purely resistive loads or capacitive loads ≤100 pF. For larger capacitive loads (e.g., long cables), a series resistor (20–100 Ω) between output and load is recommended to isolate capacitance.

How does the ESD rating of LM324DT compare to automotive variants?

LM324DT has 250 V HBM ESD rating per JESD22-A114. In contrast, LM324WDT and TSB572IDT offer 700 V and >2 kV HBM respectively. This makes LM324DT suitable for controlled assembly environments but not for direct handling in automotive end-of-line test without additional protection circuitry.

LM324DT 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

LM324DT FAQ

1.How can I place an order for LM324DT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM324DT 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 LM324DT reliable?

The price and inventory of LM324DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324DT is usually 5 days.

3.What payment methods are accepted for LM324DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM324DT?

LM324DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM324DT 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 LM324DT?

For technical support, including LM324DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324DT requirements.

6.How does Aetrix verify that LM324DT is sourced from the original manufacturer or authorized distributors?

All LM324DT 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 LM324DT meets industry standards.

7.What is the process for return or replacement of LM324DT?

All LM324DT units undergo pre-shipment inspection (PSI). If there is an issue with LM324DT, 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 LM324DT part is unused and in its original packaging.

Return procedure for LM324DT:

1.Submit a request within 90 days.

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

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