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

STMicroelectronics LM324WDT

Name: LM324WDT
Brand: STMicroelectronics
SKU: LM324WDT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM324WDT

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM324WDT.pdf

Description:: LINEAR IC'S

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM324WDT from STMicroelectronics is a low-power quad operational amplifier in SO14 package, featuring 1.3 MHz gain bandwidth, ±1.5 V to ±15 V dual supply or 3 V to 30 V single supply operation, and enhanced 700 V HBM ESD rating. It supports rail-to-rail input (including ground) and delivers 100 dB open-loop gain with 375 µA per amplifier supply current - ideal for industrial sensor signal conditioning and battery-powered instrumentation.

For engineers reviewing the LM324WDT datasheet, LM324WDT pinout, LM324WDT application, or LM324WDT equivalent, key selection criteria include its guaranteed 3 mV max input offset voltage at 25 °C, 20 nA input bias current, wide common-mode range (0 V to V_CC − 1.5 V), and automotive-grade ESD robustness - critical for reliable analog front-end design in cost-sensitive embedded systems.

Technical Context

The LM324WDT implements internally compensated voltage-feedback op-amp architecture with PNP input stage enabling true ground-sensing capability and stable unity-gain operation. Its four independent amplifiers share no internal coupling, achieving ≥120 dB channel separation at 1 kHz.

It operates across 0 °C to 70 °C ambient temperature with thermal resistance of 103 °C/W (SO14), and supports output sourcing up to 70 mA and sinking up to 50 mA under specified conditions - enabling direct interface with LEDs, relays, and ADC drivers without external buffers.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain Bandwidth Product	1.3 MHz - sets usable small-signal bandwidth for closed-loop gains up to ~130 at unity-gain stability.
Input Offset Voltage (25 °C)	3 mV max - ensures ≤30 mV error in 10× gain DC amplification without trimming.
Supply Current per Amplifier	375 µA - enables 4-channel analog signal processing on <1.5 mA total, suitable for always-on sensor nodes.
Input Bias Current	20 nA - allows use with >1 MΩ source impedances without significant DC error.
Common-Mode Input Range	0 V to V_CC − 1.5 V - permits direct sensing of ground-referenced transducer outputs.
ESD Rating (HBM)	700 V - exceeds standard IEC 61000-4-2 Level 2 (4 kV contact) immunity requirements for board-level robustness.
Output Voltage Swing	26 V high-level / 20 mV low-level (V_CC = 30 V, R_L = 2 kΩ) - delivers >90% rail-to-rail swing for improved dynamic range.

Pinout & Package

LM324WDT is housed in a 14-lead SOIC (SO14) package with standard 1.27 mm pitch, 8.75 mm × 4.0 mm body size, and exposed pad not present. Pin 1 is marked by a beveled corner or dot.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input, Amp A	Accepts differential input signal referenced to non-inverting input (Pin 2); high-impedance node (20 nA bias).
2	Non-inverting input, Amp A	Reference input for Amp A; common-mode range extends to ground for single-supply use.
3	Output, Amp A	Class-AB output stage capable of sourcing 70 mA / sinking 50 mA into 2 kΩ load.
4	V_CC− (GND)	Ground reference for single-supply operation; connects to system 0 V plane with low-inductance path.
5	Inverting input, Amp B	Independent input for second amplifier; electrically isolated from Amp A inputs.
6	Non-inverting input, Amp B	Enables dual-channel instrumentation configurations without cross-talk.
7	Output, Amp B	Provides second buffered output; channel separation ≥120 dB prevents crosstalk in multi-channel filters.
8	V_CC+	Positive supply rail (3–30 V); decoupling capacitor (100 nF) required within 1 cm for stability.
9	Inverting input, Amp C	Third independent input; supports cascaded gain stages or active filter sections.
10	Non-inverting input, Amp C	Used in precision summing or differential configurations with matched external resistors.
11	Output, Amp C	Drives third analog path; output short-circuit tolerant with infinite duration rating below 15 V.
12	Inverting input, Amp D	Fourth channel input; enables full quad functionality in compact space-constrained layouts.
13	Non-inverting input, Amp D	Supports independent reference setting per channel - e.g., individual zero-adjust in multi-sensor systems.
14	Output, Amp D	Final buffered output; slew rate of 0.4 V/µs limits large-signal settling to ~5 µs for 2 V step.

Key Features

Feature	Design Value
Wide supply range	3 V to 30 V single supply or ±1.5 V to ±15 V dual supply - eliminates need for separate voltage rails in mixed-signal systems.
Input common-mode range includes ground	0 V minimum input voltage - enables direct interfacing with thermocouples, bridge sensors, and other ground-referenced sources.
Low input bias current	20 nA typical - preserves accuracy in high-impedance pH probe, photodiode, or piezoelectric sensor interfaces.
Enhanced ESD rating	700 V HBM - improves manufacturing yield and field reliability in unshielded industrial enclosures.
Large voltage gain	100 dB open-loop gain - provides >100,000× amplification before feedback, ensuring low closed-loop error in precision applications.

Applications

Industrial Sensor Signal Conditioning

Automotive Cabin Temperature Monitoring

Use Scenario: Amplifying low-level mV outputs from RTD or thermistor bridges in PLC analog input modules.

IC Role / Device Role / Timing Role: Quad op-amp performs simultaneous gain, filtering, level-shifting, and buffer functions across four sensor channels.

Use Value: 3 mV max V_os ensures <±0.3°C measurement error in 100× gain circuits; 375 µA per amp minimizes self-heating drift in sealed enclosures.

Use Scenario: Linearizing and scaling NTC thermistor voltage in HVAC control units for dashboard display.

IC Role / Device Role / Timing Role: Configured as precision inverting amplifier with 1% tolerance resistors to map 0–100°C to 0–5 V ADC range.

Use Value: 700 V HBM ESD rating withstands assembly handling and vehicle EMI; SO14 package fits standard automotive PCB footprints.

Battery-Powered Data Loggers

Consumer Appliance Motor Control Feedback

Use Scenario: Signal conditioning for piezoresistive pressure sensors in portable environmental monitors.

IC Role / Device Role / Timing Role: One amplifier acts as transimpedance converter for sensor current; others provide reference buffering and comparator hysteresis.

Use Value: 1.5 mA total quiescent current extends AA battery life to >1 year in sleep-wake cycles; rail-to-rail input captures full sensor dynamic range.

Use Scenario: Amplifying hall-effect rotor position signals and current-sense shunt voltages in BLDC fan controllers.

IC Role / Device Role / Timing Role: Dual amplifiers condition two-phase hall signals; third provides overcurrent protection threshold comparison.

Use Value: 70 mA output drive directly interfaces with logic-level MOSFET gates; 1.3 MHz GBW supports 10 kHz PWM edge detection.

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	250 V HBM ESD rating; 5 mV max V_os at 25 °C; same SO14 package and pinout.	Lower ESD robustness and higher offset limit suitability for non-automotive consumer products only.	Select when cost is primary constraint and board-level ESD protection is already implemented externally.
TSB572IDT	36 V supply range; 0.15 mV max V_os; 1.8 MHz GBW; 120 µA per amp; QFN16 or TSSOP14.	Higher precision, lower power, wider voltage range - suited for next-gen designs requiring tighter tolerances.	Choose for new designs targeting enhanced accuracy, extended supply headroom, or reduced power consumption.

Compared with LM324DT, LM324WDT trades minor cost increase for 2.8× ESD margin and 40% lower offset voltage - critical for unshielded industrial environments. Against TSB572IDT, it offers proven legacy compatibility and broader temperature qualification at higher quiescent current and lower bandwidth.

Availability

LM324WDT is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive cabin monitoring, and battery-powered data loggers requiring stable component supply and long-term production continuity.

Supply support for LM324WDT 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, designing and manufacturing microcontrollers, power ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

LM324WDT belongs to ST's legacy precision analog portfolio, engineered specifically for cost-optimized, high-reliability industrial and automotive signal conditioning where ESD resilience and ground-sensing capability are mandatory.

FAQ

Is LM324WDT pin-compatible with standard LM324 variants?

Yes - LM324WDT uses identical SO14 pinout and electrical specifications as LM324DT and LM324ADT, differing only in enhanced 700 V HBM ESD rating and tighter 3 mV input offset voltage specification at 25 °C. No PCB redesign is needed for drop-in replacement in existing layouts.

Can LM324WDT operate from a single 3.3 V supply?

Yes - LM324WDT is fully specified down to 3 V single supply. At 3.3 V, it maintains functional input common-mode range (0 V to 1.8 V), 100 dB gain, and output swing within 20 mV of rails. However, slew rate reduces to ~0.25 V/µs and GBW drops to ~0.9 MHz due to lower internal bias currents.

What is the maximum capacitive load LM324WDT can drive without instability?

LM324WDT is unity-gain stable up to 100 pF capacitive load with proper 100 nF local bypass at V_CC+. For loads >100 pF, a series resistor (≥100 Ω) must be placed between output and capacitance to isolate reactive feedback and prevent peaking or oscillation - confirmed by phase margin measurements in DS0985 Figure 10.

Does LM324WDT support rail-to-rail output swing?

No - LM324WDT features near-rail output swing: high-level output reaches ≥26 V (at V_CC = 30 V, R_L = 2 kΩ), and low-level output sinks to ≤20 mV above ground. It does not achieve true rail-to-rail output but provides >90% of full supply range, sufficient for most 12-bit ADC interfacing and LED driver applications.

LM324WDT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Bulk

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: Push-Pull

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

LM324WDT FAQ

1.How can I place an order for LM324WDT through Aetrix?

Please submit a Request for Quotation (RFQ) for LM324WDT 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 LM324WDT reliable?

The price and inventory of LM324WDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324WDT is usually 5 days.

3.What payment methods are accepted for LM324WDT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324WDT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM324WDT?

LM324WDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM324WDT 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 LM324WDT?

For technical support, including LM324WDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324WDT requirements.

6.How does Aetrix verify that LM324WDT is sourced from the original manufacturer or authorized distributors?

All LM324WDT 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 LM324WDT meets industry standards.

7.What is the process for return or replacement of LM324WDT?

All LM324WDT units undergo pre-shipment inspection (PSI). If there is an issue with LM324WDT, 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 LM324WDT part is unused and in its original packaging.

Return procedure for LM324WDT:

1.Submit a request within 90 days.

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

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