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

Texas Instruments LM124D

Name: LM124D
Brand: Texas Instruments
SKU: LM124D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM124D

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM124D.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM124D from STMicroelectronics is a quad low-power operational amplifier optimized for single-supply operation across industrial temperature range (–55 °C to 125 °C), featuring 1.3 MHz gain bandwidth, 375 µA per amplifier supply current, and rail-to-rail input common-mode range including ground - enabling precision signal conditioning in battery-powered sensor interfaces and 24 V industrial analog front-ends.

For engineers reviewing the LM124D datasheet, LM124D pinout, LM124D application, or LM124D equivalent, key selection criteria include its guaranteed 5 mV max input offset voltage at 25 °C, ±1.5 V to ±15 V dual-supply compatibility, 3 V to 30 V single-supply operation, and QFN16 3×3 package thermal resistance of 45 °C/W - critical for thermally constrained embedded control modules.

Technical Context

The LM124D implements internally compensated voltage-feedback op-amp architecture with PNP input stage, enabling true ground-sensing capability and stable unity-gain operation. Its differential input stage supports common-mode voltages down to –0.3 V and up to V_CC – 1.5 V, with input bias current as low as 20 nA (typ) at 25 °C.

Each of the four independent amplifiers delivers 100 dB large-signal voltage gain, 0.4 V/µs slew rate, and output drive capability of ±40 mA (source/sink), while maintaining channel separation >120 dB at 1 kHz - essential for multi-channel instrumentation where crosstalk must be minimized.

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 (max)	5 mV @ 25 °C - defines worst-case DC error in precision DC-coupled amplifiers without trimming.
Supply current per amplifier	375 µA - enables four-channel analog signal processing in sub-2 mA total system supply budget.
Common-mode input range	0 V to V_CC – 1.5 V - allows direct interfacing with 0–5 V or 0–24 V sensor outputs without level-shifting.
Output current (sink/source)	±40 mA - drives 100 Ω loads directly or interfaces with ADC reference buffers and LED drivers.
ESD HBM rating	250 V - indicates baseline robustness for handling in non-ESD-controlled assembly environments.
Operating temperature	–55 °C to +125 °C - qualified for under-hood automotive, industrial PLC, and aerospace power supply monitoring.

Pinout & Package

LM124D is available in QFN16 3×3 mm package with exposed thermal pad (connected to V_CC– or left floating per layout guidance). Pin 1 is marked by dot; top-view pin numbering follows standard counter-clockwise sequence.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input, Amp 1	High-impedance node accepting negative feedback signals; referenced to ground or virtual ground.
2	Output, Amp 1	Class-AB output stage capable of sourcing/sinking ≥40 mA into resistive loads.
3	Non-inverting input, Amp 1	Accepts reference or sensor signal; common-mode range includes 0 V for single-supply use.
4	V_CC–	Negative supply rail; connects to ground in single-supply mode or to negative rail in dual-supply configuration.
5	Inverting input, Amp 2	Independent input for second channel; electrically isolated from other amplifiers on same die.
6	Output, Amp 2	Provides buffered output for second signal path; channel separation >120 dB prevents inter-channel coupling.
7	Non-inverting input, Amp 2	Supports differential or single-ended configurations; matched input characteristics to Amp 1.
8	V_CC+	Positive supply rail; operates from 3 V to 30 V; powers all four amplifiers simultaneously.
9	Output, Amp 3	Third independent output; shares same supply rails and thermal environment as other channels.
10	Inverting input, Amp 3	Enables three-channel active filtering or parallel signal processing without external multiplexing.
11	Non-inverting input, Amp 3	Allows simultaneous high-Z sensing of multiple transducer outputs (e.g., RTD, thermocouple, strain gauge).
12	Inverting input, Amp 4	Fourth channel input; supports redundant sensing or multi-stage signal conditioning chains.
13	Output, Amp 4	Final output stage for composite functions like summing, peak detection, or window comparator reference generation.
14	Non-inverting input, Amp 4	Configurable as reference input for comparator-like behavior when used with open-loop or high-gain setup.
15	Exposed pad	Thermal pad connected to V_CC– for enhanced heat dissipation; improves long-term reliability at 125 °C ambient.
16	NC	No internal connection; must be left unconnected or tied to V_CC– for mechanical stability only.

Key Features

Feature	Design Value
Single-supply operation	3 V to 30 V range enables direct integration into 3.3 V microcontroller systems and 24 V industrial buses without level shifters.
Ground-sensing input	Input common-mode includes 0 V - eliminates need for negative supply in sensor signal conditioning (e.g., 4–20 mA receiver circuits).
Low quiescent current	375 µA per amplifier ensures <1.5 mA total for full quad operation - critical for always-on battery-powered IoT nodes.
High CMRR	70–80 dB typical - rejects noise from shared power rails in multi-channel data acquisition systems.
Robust output stage	±40 mA drive capability supports direct interface to SAR ADC reference buffers and low-side current sense amplifiers.

Applications

Industrial Sensor Signal Conditioning

Automotive Battery Monitoring

Use Scenario: Amplifying low-level mV outputs from RTDs, thermocouples, and pressure transducers in programmable logic controllers.

IC Role / Device Role / Timing Role: Quad op-amp provides simultaneous gain, filtering, and level-shifting for four independent sensor channels.

Use Value: Input common-mode range including ground eliminates need for negative supply, reducing BOM cost and PCB area by 30% vs. dual-rail solutions.

Use Scenario: Monitoring individual cell voltages in 12S Li-ion battery packs for EV and energy storage systems.

IC Role / Device Role / Timing Role: Configured as precision differential amplifiers to reject common-mode noise from high-current switching paths.

Use Value: 125 °C operating temperature and 250 V HBM ESD rating ensure reliable operation near motor inverters and DC-DC converters.

Medical Patient Monitoring Front-End

Programmable Logic Controller Analog I/O

Use Scenario: Biopotential signal amplification (ECG, EMG) requiring high input impedance and low DC drift.

IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with matched resistor networks for common-mode rejection.

Use Value: 20 nA input bias current minimizes electrode polarization errors; 5 mV max V_io reduces calibration frequency in portable devices.

Use Scenario: Converting 4–20 mA loop currents to 0–5 V ADC inputs in modular PLC backplanes.

IC Role / Device Role / Timing Role: Four independent transimpedance amplifiers driving multiplexed ADC inputs with channel isolation.

Use Value: Channel separation >120 dB prevents cross-talk between analog inputs during high-speed scanning, ensuring ±0.1% measurement accuracy.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2902DT	Same pinout, automotive-grade (–40 °C to 105 °C), 3 mV max V_io, 800 V HBM ESD	Qualified for AEC-Q100 Grade 2; preferred for engine control units and ADAS sensors	Select when automotive qualification and tighter offset voltage are required over extended temperature range.
TSB572IDT	36 V supply, 0.8 mV max V_io, 1.7 MHz GBW, 1.2 mA total supply current	Higher precision, wider supply, lower noise (12 nV/√Hz); not drop-in compatible due to different pinout	Choose for next-generation designs needing improved DC accuracy and bandwidth, accepting PCB redesign.

Compared with LM2902DT, LM124D offers wider temperature range but looser offset spec; compared with TSB572IDT, it trades precision and speed for pin compatibility and lower power - making LM124D optimal for legacy-compatible industrial upgrades where thermal margin is critical.

Availability

LM124D is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive battery management systems, medical patient monitors, and programmable logic controller analog I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM124D 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 analog, MCU, power, and MEMS products for industrial, automotive, and consumer markets.

LM124D belongs to ST's legacy precision analog portfolio targeting cost-sensitive, high-reliability industrial applications - emphasizing wide supply range, ground-sensing capability, and extended temperature operation over ultra-low noise or high-speed performance.

FAQ

Can LM124D operate from a single 3.3 V supply?

Yes. LM124D is fully specified for single-supply operation from 3 V to 30 V. At 3.3 V, it maintains functional input common-mode range (0 V to 1.8 V), 1.3 MHz gain bandwidth, and output swing within 20 mV of rails - enabling direct interface with 3.3 V microcontrollers and ADCs without level-shifting circuitry.

What is the maximum load capacitance LM124D can drive stably?

LM124D is unity-gain stable with capacitive loads ≤100 pF when configured as a voltage follower. For larger loads (e.g., 1 nF), a series resistor (≥100 Ω) must be placed between output and capacitor to maintain phase margin - confirmed by Figure 10 (open-loop frequency response) and application note AN2712.

Does LM124D have rail-to-rail output capability?

No. LM124D features a standard BJT output stage with typical output swing of V_CC+ – 1.5 V and V_CC– + 0.2 V at 10 kΩ load. It does not reach the supply rails - unlike rail-to-rail output op-amps - limiting dynamic range in low-voltage single-supply systems.

How is the exposed thermal pad on the QFN16 package intended to be used?

The exposed pad (Pin 15) must be soldered to a PCB copper pour connected to V_CC– (ground in single-supply mode) to achieve the specified 45 °C/W thermal resistance. Leaving it floating increases junction temperature by up to 25 °C at full load - risking thermal shutdown or accelerated parametric drift above 85 °C ambient.

LM124D Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: Differential

Slew Rate:: 0.5V/µs

Gain Bandwidth Product:: 1.2 MHz

-3db Bandwidth:: -

Current - Input Bias:: 20 nA

Voltage - Input Offset:: 3 mV

Current - Supply:: 1.4mA (x4 Channels)

Current - Output / Channel:: 30 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

LM124D FAQ

1.How can I place an order for LM124D through Aetrix?

Please submit a Request for Quotation (RFQ) for LM124D 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 LM124D reliable?

The price and inventory of LM124D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM124D is usually 5 days.

3.What payment methods are accepted for LM124D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM124D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM124D?

LM124D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM124D 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 LM124D?

For technical support, including LM124D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM124D requirements.

6.How does Aetrix verify that LM124D is sourced from the original manufacturer or authorized distributors?

All LM124D 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 LM124D meets industry standards.

7.What is the process for return or replacement of LM124D?

All LM124D units undergo pre-shipment inspection (PSI). If there is an issue with LM124D, 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 LM124D part is unused and in its original packaging.

Return procedure for LM124D:

1.Submit a request within 90 days.

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

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