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

STMicroelectronics LM124N

Name: LM124N
Brand: STMicroelectronics
SKU: LM124N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM124N

Manufacturer:: STMicroelectronics

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: LM124N.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM124N from STMicroelectronics is a quad low-power operational amplifier designed for single-supply industrial and instrumentation applications. It features 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, ±1.5 V to ±15 V dual or 3 V to 30 V single supply operation, input common-mode range extending to ground, and 375 µA per amplifier supply current. It is commonly used in DC-coupled sensor signal conditioning and active filtering circuits.

For engineers reviewing the LM124N datasheet, LM124N pinout, LM124N application, or LM124N equivalent, key selection criteria include its rail-to-rail input capability (0 V to V_CC − 1.5 V), 20 nA max input bias current, 5 mV max input offset voltage at 25 °C, −55 °C to +125 °C operating temperature range, and compatibility with SO14, TSSOP14, and QFN16 3×3 packages.

Technical Context

The LM124N integrates four independent high-gain op-amps with internal frequency compensation, enabling stable unity-gain operation without external components. Its PNP input stage enables true ground-sensing input common-mode range and low input bias current (20 nA typ).

It supports wide supply flexibility: single supply (3–30 V) or split supplies (±1.5 V to ±15 V), with supply current independent of supply voltage magnitude. Output stage provides ±40 mA short-circuit current capability and rail-compatible output swing (e.g., 26 V high-level output at V_CC = 30 V, R_L = 2 kΩ).

Key Specifications

Parameter	Value and Actual Design Meaning
Gain bandwidth product	1.3 MHz - Enables stable closed-loop operation up to ~100 kHz with moderate gain (e.g., 10×)
Input offset voltage (max)	5 mV at 25 °C - Limits DC error in precision amplification; requires trimming or calibration in <10 mV error systems
Supply current per amplifier	375 µA - Allows battery-powered or low-power multi-channel designs with total quiescent current <1.6 mA
Input common-mode range	0 V to V_CC − 1.5 V - Supports direct interface to ground-referenced sensors (e.g., thermocouples, bridge outputs)
Large-signal voltage gain	100 dB (100,000 V/V) - Provides >60 dB open-loop gain margin at 100 Hz, ensuring accurate closed-loop behavior
Operating temperature	−55 °C to +125 °C - Qualified for military, aerospace, and extended industrial environments
ESD HBM rating	250 V - Requires handling precautions; not suitable for unshielded I/O or hot-plug interfaces without protection

Pinout & Package

LM124N is available in SO14 (standard plastic DIP footprint), TSSOP14 (thin shrink small-outline), and QFN16 3×3 mm (exposed pad, thermal-enhanced) packages. The SO14 variant uses industry-standard pinout compatible with legacy LM324 designs.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input (Amp 1)	Differential input node for first op-amp; accepts signals down to ground
2	Non-inverting input (Amp 1)	Second differential input for Amp 1; same common-mode range as Pin 1
3	Output (Amp 1)	Class AB output stage capable of sourcing/sinking ≥20 mA into 2 kΩ load
4	V_CC− (GND for single supply)	Power return reference; must be low-impedance; exposed pad on QFN connects here
5	Inverting input (Amp 2)	Independent input for second amplifier; electrically isolated from other channels
6	Non-inverting input (Amp 2)	Matches Pin 2 functionality for Amp 2; no crosstalk with Amp 1 inputs
7	Output (Amp 2)	Separate output driver; channel separation >120 dB at 1 kHz prevents inter-channel interference
8	V_CC+	Positive supply rail; supports up to 30 V single or +15 V dual; decoupling required within 1 cm
9	Inverting input (Amp 3)	Third amplifier input; identical electrical specs to Pins 1 and 5
10	Non-inverting input (Amp 3)	Third amplifier non-inverting node; matched input bias current minimizes offset drift
11	Output (Amp 3)	Third independent output; same drive strength and voltage swing as other outputs
12	Inverting input (Amp 4)	Fourth amplifier inverting input; fully isolated; supports multiplexed sensor front-ends
13	Non-inverting input (Amp 4)	Final input pair; enables 4-channel simultaneous signal processing in compact layout
14	Output (Amp 4)	Fourth output; usable for summing, level-shifting, or driving multiple loads independently

Key Features

Feature	Design Value
Ground-sensing input stage	PNP differential pair enables 0 V common-mode input - eliminates need for level-shifting in single-supply sensor interfaces
Low quiescent current	375 µA per amplifier - enables 4-channel analog front-end in <2 mA total system budget
Wide supply voltage range	3–30 V single or ±1.5–±15 V dual - simplifies power architecture across 5 V, 12 V, and 24 V industrial systems
High CMRR	70–80 dB typical - rejects noise from shared supply rails or noisy digital grounds in mixed-signal PCBs
Thermal robustness	R_thJA = 103 °C/W (SO14), 100 °C/W (TSSOP14), 45 °C/W (QFN16) - QFN variant supports higher ambient temperatures in enclosed enclosures

Applications

Industrial Sensor Signal Conditioning

DC-Coupled Instrumentation Amplifier

Use Scenario: Amplifying low-level output from a 4–20 mA loop-powered pressure transducer in a factory automation PLC module.

IC Role / Device Role / Timing Role: First-stage non-inverting amplifier with gain = 100, referenced to system ground, operating from 24 V single supply.

Use Value: Input common-mode range includes 0 V allows direct connection to transducer's grounded output; 5 mV max V_os contributes <0.5% full-scale error before calibration.

Use Scenario: Building a 3-op-amp instrumentation amplifier for thermocouple cold-junction compensation in a data logger.

IC Role / Device Role / Timing Role: Two amplifiers form precision difference stage; third provides adjustable gain; fourth buffers reference voltage.

Use Value: Matched input bias currents (20 nA typ) minimize resistor-induced offset errors; 100 dB gain ensures >60 dB CMRR even with 0.1% resistor mismatch.

Active Low-Pass Filter for Motor Control Feedback

Single-Supply Peak Detector

Use Scenario: Filtering PWM ripple from a motor phase current shunt measurement before ADC sampling in an embedded servo drive.

IC Role / Device Role / Timing Role: Second-order Sallen-Key low-pass filter (f_c = 10 kHz) using two LM124N amplifiers in cascade.

Use Value: 1.3 MHz GBP supports stable 10 kHz cutoff with Q ≤ 0.707; rail-compatible inputs accept 0–3.3 V sensed waveform directly.

Use Scenario: Capturing peak amplitude of a 1 kHz AC-coupled vibration sensor signal in predictive maintenance hardware.

IC Role / Device Role / Timing Role: Unity-gain buffer + precision diode clamp + hold capacitor; fourth amplifier compensates input bias current.

Use Value: 20 nA input bias current limits droop rate on 1 µF hold capacitor to <20 mV/s - enables >1 s hold time with <20 mV error.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2902W	Automotive-grade (-40 °C to +125 °C), 700 V HBM ESD, 3 mV V_os max, same SO14/TSSOP14 pinout	Qualified per AEC-Q100; enhanced ESD robustness for automotive body electronics and infotainment I/O	Select when automotive qualification, higher ESD immunity, or tighter offset are required - otherwise LM124N offers broader temp range
TSB572	36 V supply, 2.5 MHz GBP, 120 µA per amp, rail-to-rail I/O, 1.5 mV V_os, QFN16 only	Higher speed, lower power, and full rail-to-rail operation - suited for battery-powered portable instruments and precision data acquisition	Choose for new designs needing >1 MHz bandwidth or sub-200 µA power; not drop-in due to different pinout and RRO architecture

Compared with LM2902W and TSB572, LM124N uniquely combines military-grade temperature range (−55 °C to +125 °C), proven reliability in harsh industrial settings, and broad package availability - making it optimal for legacy-compatible, high-reliability, wide-temperature applications where 1.3 MHz bandwidth suffices.

Availability

LM124N is available at Aetrix Electronics and suitable for industrial control systems, test and measurement equipment, and aerospace subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM124N 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 chips, and MEMS sensors for industrial, automotive, and consumer markets.

The LM124N belongs to ST's legacy precision analog portfolio, engineered specifically for high-reliability, wide-temperature industrial signal conditioning - emphasizing stability, manufacturability, and long-term availability over cutting-edge specs.

FAQ

What is the maximum supply voltage for LM124N in single-supply mode?

The absolute maximum single-supply voltage is 32 V (per Table 1), but the recommended operating range is 3 V to 30 V (per Table 2). Operation above 30 V risks exceeding thermal limits under load, especially in SO14 packages with R_thJA = 103 °C/W. Derating is required above 24 V in enclosed environments.

Can LM124N drive a 600 Ω audio line?

No - LM124N is not optimized for low-impedance audio loads. Its output stage delivers ±40 mA short-circuit current, but sustained 600 Ω loading at ±10 V would require >33 mA, causing thermal stress and distortion. It is rated for ≥2 kΩ loads; use dedicated audio line drivers (e.g., TPA6130A2) for 600 Ω applications.

Does LM124N have rail-to-rail input or output capability?

LM124N has rail-to-rail *input* capability down to ground (0 V) but not up to V_CC; the upper common-mode limit is V_CC − 1.5 V. Its output swings within ~1.5 V of each rail (e.g., 26 V high-level at V_CC = 30 V), so it is not rail-to-rail output. For true RRO, consider TSB572 or TSX922.

How does LM124N differ from LM324 in terms of temperature range and reliability?

LM124N is specified for −55 °C to +125 °C (military grade), while LM324 is rated 0 °C to +70 °C (commercial grade). LM124N undergoes additional screening for parameter stability and long-term reliability under thermal cycling, making it suitable for avionics, downhole tools, and defense electronics where LM324 would fail prematurely.

LM124N Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: Differential

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:: -55°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-DIP

LM124N FAQ

1.How can I place an order for LM124N through Aetrix?

Please submit a Request for Quotation (RFQ) for LM124N 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 LM124N reliable?

The price and inventory of LM124N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM124N is usually 5 days.

3.What payment methods are accepted for LM124N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM124N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM124N?

LM124N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM124N 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 LM124N?

For technical support, including LM124N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM124N requirements.

6.How does Aetrix verify that LM124N is sourced from the original manufacturer or authorized distributors?

All LM124N 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 LM124N meets industry standards.

7.What is the process for return or replacement of LM124N?

All LM124N units undergo pre-shipment inspection (PSI). If there is an issue with LM124N, 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 LM124N part is unused and in its original packaging.

Return procedure for LM124N:

1.Submit a request within 90 days.

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

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