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

STMicroelectronics LM324AD

Name: LM324AD
Brand: STMicroelectronics
SKU: LM324AD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM324AD

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM324AD.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM324AD from STMicroelectronics is a quad low-power operational amplifier with rail-to-rail output swing, designed for single-supply operation from 3 V to 30 V (or ±1.5 V to ±15 V dual supply). It delivers 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and input common-mode range extending to ground - enabling use in sensor signal conditioning, industrial analog front-ends, and battery-powered instrumentation.

For engineers reviewing the LM324AD datasheet, LM324AD pinout, LM324AD application, or LM324AD equivalent, key selection criteria include its 375 µA per-amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (A-grade), and compatibility with TSSOP14 and SO14 packages in commercial temperature range (0 °C to 70 °C).

Technical Context

The LM324AD integrates four independent high-gain op-amps with internal frequency compensation, supporting unity-gain stable operation. Its input stage uses PNP transistors enabling true ground-sensing capability, while the output stage provides rail-to-rail sourcing/sinking up to ±40 mA per channel.

It operates across wide supply ranges without performance degradation: supply current remains stable from 3 V to 30 V, and common-mode input range extends from 0 V to (V_CC – 1.5 V) at 25 °C. Input offset voltage drift is specified at 7–30 µV/°C, supporting precision DC-coupled designs.

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 (max)	3 mV at 25 °C - enables accurate DC amplification with ≤0.3% error in 1 V full-scale systems
Supply current per amplifier	375 µA - allows four-channel operation under 1.5 mA total, ideal for low-power portable systems
Input bias current (typ)	20 nA - minimizes voltage error across high-impedance sensor interfaces (e.g., thermistors, photodiodes)
Common-mode input range	0 V to (V_CC – 1.5 V) - permits direct interfacing with ground-referenced sensors and single-supply ADC drivers
Output current (sink/source)	±40 mA - drives 75 Ω transmission lines or LED loads without external buffers
Slew rate	0.4 V/µs - supports 100 kHz sine wave output at 25 Vpp without distortion

Pinout & Package

LM324AD is available in TSSOP14 and SO14 packages. The TSSOP14 variant offers compact footprint (5.0 × 6.4 mm) and improved thermal resistance (R_thJA = 100 °C/W) versus SO14 (R_thJA = 103 °C/W), suitable for space-constrained industrial PCBs.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input of Amp A	Accepts differential input signals; referenced to ground or virtual ground in standard configurations
2	Non-inverting input of Amp A	Used for positive feedback paths or reference voltage injection in comparator modes
3	Output of Amp A	Rail-to-rail capable; sinks or sources up to 40 mA into resistive loads
4	V_CC– (GND in single supply)	Return path for all four amplifiers; must be low-impedance to minimize PSRR degradation
5	Non-inverting input of Amp B	Independent input node; shares no internal coupling with other channels below 120 kHz
6	Inverting input of Amp B	Configurable as summing junction or feedback point in multi-stage filters
7	Output of Amp B	Electrically isolated from other outputs; channel separation >120 dB at 1 kHz
8	V_CC+	Single-supply rail (3–30 V) or positive rail in dual-supply mode; bypass capacitor required
9	Inverting input of Amp C	Supports high-Z sensing; input protection diodes clamp to rails at ±0.3 V overdrive
10	Non-inverting input of Amp C	Used for offset nulling or reference biasing in precision instrumentation topologies
11	Output of Amp C	Capable of driving capacitive loads up to 100 pF directly without instability
12	Inverting input of Amp D	Valid for AC-coupled applications where input common-mode exceeds V_CC–1.5 V
13	Non-inverting input of Amp D	Compatible with resistor networks matching <1% tolerance for CMRR >70 dB
14	Output of Amp D	Provides buffered output for DAC reconstruction or active filter stages

Key Features

Feature	Design Value
Wide gain bandwidth	1.3 MHz enables stable unity-gain follower operation and 100 kHz low-pass filtering
Input common-mode range includes ground	Allows direct connection of 0 V-referenced transducers (e.g., strain gauges, RTDs) without level-shifting
Low input bias current (20 nA typ)	Reduces voltage error across 1 MΩ source impedances to <20 mV, critical for pH and ion-selective electrodes
Low supply current (375 µA/amp)	Permits continuous four-channel monitoring in energy-harvesting nodes with <1.5 mA total quiescent draw
Single-supply operation (3–30 V)	Eliminates need for split supplies in PLC I/O modules, simplifying power architecture and reducing BOM cost

Applications

Industrial Sensor Signal Conditioning

Automotive Cabin Climate Control

Use Scenario: Amplifying millivolt-level outputs from thermocouples and pressure transducers in factory-floor monitoring systems.

IC Role / Device Role / Timing Role: Quad op-amp configured as instrumentation amplifier (Amp A/B), low-pass filter (Amp C), and buffer (Amp D) on single IC.

Use Value: 3 mV max V_os ensures ≤0.15% measurement error at 2 V full scale; rail-to-rail output drives 12-bit SAR ADC inputs directly.

Use Scenario: Processing NTC thermistor signals and driving PWM-controlled blower motors in HVAC control units.

IC Role / Device Role / Timing Role: Dual-channel signal conditioning (Amp A/B) and motor driver interface (Amp C/D in comparator + buffer mode).

Use Value: 0–30 V supply range matches vehicle battery fluctuations (9–16 V); 40 mA output current eliminates discrete transistor stage for fan control.

Portable Medical Pulse Oximetry

Smart Home Smoke Detector Analog Front-End

Use Scenario: Amplifying weak photodiode currents from red/IR LEDs in wearable pulse oximeters powered by coin cells.

IC Role / Device Role / Timing Role: Transimpedance amplifier (Amp A), AC-coupled inverting stage (Amp B), and LED drive buffer (Amp C/D).

Use Value: 20 nA input bias current prevents saturation in 100 kΩ–1 MΩ TIA feedback networks; 375 µA/amp extends battery life beyond 72 hours.

Use Scenario: Conditioning ionization chamber current (pA–nA range) and driving piezoelectric alarm drivers in battery-operated smoke alarms.

IC Role / Device Role / Timing Role: Ultra-low-current preamplifier (Amp A), window comparator (Amp B/C), and audio driver (Amp D).

Use Value: Ground-sensing input accepts 0 V chamber bias; 30 V absolute max rating withstands ESD events during manufacturing handling.

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	Higher input offset voltage (5 mV max vs. 3 mV), same package and temperature range	Suitable for non-critical DC amplification where cost is prioritized over accuracy	Select when V_os budget allows ≥5 mV and production volume justifies standard grade
TSB572IDT	36 V supply range, 1.8 MHz GBW, 0.15 mV V_os, automotive-grade (AEC-Q100)	Required for 24 V industrial buses or automotive environments with extended temperature and ESD demands	Choose for next-generation designs needing enhanced accuracy, wider supply, and automotive qualification

Compared with LM324DT, LM324AD offers tighter offset for precision sensing; compared with TSB572IDT, it trades higher accuracy and ruggedness for lower cost and legacy design compatibility in commercial applications.

Availability

LM324AD is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive cabin electronics, and portable medical devices requiring stable component supply across long-lifecycle programs.

Supply support for LM324AD 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 mobility, power, and IoT applications since 1987.

The LM324x series belongs to ST's general-purpose analog portfolio, engineered for cost-sensitive, high-volume industrial and consumer systems requiring robust single-supply op-amp functionality with proven reliability.

FAQ

What is the maximum operating temperature for LM324AD?

The LM324AD is rated for commercial temperature range: 0 °C to 70 °C. This is confirmed in Table 2 of DS0985 Rev 8, where "LM324x" explicitly lists Tmin = 0 °C and Tmax = 70 °C. Operation outside this range may cause parametric shift in V_os, I_ib, and gain, and is not guaranteed by STMicroelectronics.

Can LM324AD drive capacitive loads?

Yes - LM324AD can directly drive capacitive loads up to 100 pF while maintaining stability, as verified in Figure 14 (voltage follower small-signal pulse response) and electrical characteristics table (CL = 100 pF used in GBP and SR test conditions). For loads >100 pF, a series isolation resistor (≥100 Ω) is recommended to prevent peaking or oscillation.

Does LM324AD support dual-supply operation?

Yes - LM324AD operates with dual supplies from ±1.5 V to ±15 V, as specified in Table 2 (Operating Conditions). The input common-mode range remains 0 V to (V_CC+ – 1.5 V), and output swings rail-to-rail relative to both supplies. No external level-shifting components are needed for symmetric ±15 V operation.

What is the ESD rating of LM324AD?

LM324AD has Human Body Model (HBM) ESD rating of 800 V, as documented in Table 7 (Ordering Information) and Table 1 (Absolute Maximum Ratings). This applies to all pins; no additional protection circuitry is required for standard board handling, though 1500 V CDM rating further enhances robustness during automated assembly.

LM324AD Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

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:: 30 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

LM324AD FAQ

1.How can I place an order for LM324AD through Aetrix?

Please submit a Request for Quotation (RFQ) for LM324AD 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 LM324AD reliable?

The price and inventory of LM324AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324AD is usually 5 days.

3.What payment methods are accepted for LM324AD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324AD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM324AD?

LM324AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM324AD 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 LM324AD?

For technical support, including LM324AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324AD requirements.

6.How does Aetrix verify that LM324AD is sourced from the original manufacturer or authorized distributors?

All LM324AD 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 LM324AD meets industry standards.

7.What is the process for return or replacement of LM324AD?

All LM324AD units undergo pre-shipment inspection (PSI). If there is an issue with LM324AD, 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 LM324AD part is unused and in its original packaging.

Return procedure for LM324AD:

1.Submit a request within 90 days.

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

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