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

Texas Instruments LM224N

Name: LM224N
Brand: Texas Instruments
SKU: LM224N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM224N

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM224N.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LM224N 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 features 1.3 MHz gain-bandwidth product, 100 dB large-signal voltage gain, and input common-mode range extending to ground - enabling direct interfacing with sensors and microcontroller ADCs in industrial signal conditioning and sensor front-ends.

For engineers reviewing the LM224N datasheet, LM224N pinout, LM224N application, or LM224N equivalent, key selection criteria include its 375 µA/amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (LM224A variant), wide common-mode input range (0 V to V_CC–1.5 V), and QFN16/TSSOP14/SO14 package compatibility across temperature grades.

Technical Context

The LM224N implements internally frequency-compensated high-gain DC-coupled amplifiers with PNP input stage architecture, supporting true single-supply operation without level-shifting circuitry. Its input stage allows common-mode voltages down to ground while maintaining stable biasing and low input current drift (≤200 pA/°C).

Each amplifier delivers rail-to-rail output swing into 2 kΩ loads, with sourcing capability up to 40 mA and sinking up to 20 mA at V_CC = 15 V. Channel separation exceeds 120 dB at 1 kHz, minimizing crosstalk in multi-channel sensing systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain bandwidth product	1.3 MHz - supports stable unity-gain buffer or gain-of-10 amplification up to ~130 kHz
Large-signal voltage gain	100 dB (typ.) - provides ≥100,000× open-loop gain for precision DC amplification
Input offset voltage (max)	3 mV @ 25°C (LM224A) - limits DC error to ≤3 mV in non-inverting gain-of-100 circuits
Supply current per amplifier	375 µA - enables four-channel analog signal conditioning in battery-powered IoT nodes
Input bias current	20 nA (typ.) - permits use with high-impedance sources (e.g., pH electrodes, photodiodes)
Common-mode input range	0 V to V_CC–1.5 V - allows direct connection to 0–5 V sensor outputs without external bias resistors
Slew rate	0.4 V/µs - sufficient for <10 kHz full-power sine wave reproduction at 10 Vpp
ESD rating (HBM)	250 V - meets basic industrial handling requirements (not automotive-grade)

Pinout & Package

LM224N is available in SO14, TSSOP14, and QFN16 3×3 mm packages. The SO14 and TSSOP14 variants share identical pin numbering; QFN16 adds exposed thermal pad (connectable to V_CC– or floating).

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting input (amp A)	Accepts differential input signal referenced to amp A's non-inverting input (pin 2)
2	Non-inverting input (amp A)	Reference node for amp A; supports ground-referenced inputs in single-supply mode
3	Output (amp A)	Rail-to-rail output capable of sourcing/sinking ≥20 mA into 2 kΩ load
4	V_CC– (negative supply / GND)	Ground reference for single-supply operation; connects to system GND or negative rail
5	Inverting input (amp B)	Second channel input; electrically isolated from amp A with >120 dB channel separation
6	Non-inverting input (amp B)	Independent reference for amp B; supports separate sensor biasing
7	Output (amp B)	Full-output swing channel for parallel signal paths (e.g., dual-sensor monitoring)
8	V_CC+ (positive supply)	Accepts 3–30 V single supply or +15 V in dual-rail configuration
9	Inverting input (amp C)	Third channel input; layout symmetry recommended to minimize inter-channel coupling
10	Non-inverting input (amp C)	Enables independent gain-setting for third sensor channel
11	Output (amp C)	Provides third analog output path without external buffering
12	Inverting input (amp D)	Fourth channel input; supports quad-channel data acquisition architectures
13	Non-inverting input (amp D)	Allows simultaneous conditioning of four independent analog signals
14	Output (amp D)	Final output channel; usable as comparator hysteresis generator or active filter stage

Key Features

Feature	Design Value
Single-supply operation	3 V to 30 V range eliminates need for split supplies in PLC I/O modules and sensor transmitters
Input common-mode range includes ground	Enables direct interface with 0–V_CC output sensors (e.g., thermistors, RTDs) without external level shifters
Low input bias current (20 nA)	Preserves signal integrity when driving high-impedance sources like piezoelectric accelerometers
Rail-to-rail output swing	Maximizes dynamic range in 3.3 V or 5 V microcontroller-based systems with limited headroom
Thermal shutdown protection	Prevents latch-up during sustained output short-circuits in industrial control feedback loops
QFN16 3×3 mm option	Reduces PCB area by 60% vs. SO14 while improving thermal resistance (R_thJA = 45 °C/W)

Applications

Industrial Sensor Signal Conditioning

Automotive Cabin Temperature Monitoring

Use Scenario: Amplifying millivolt-level outputs from thermocouples and RTDs in programmable logic controllers.

IC Role / Device Role / Timing Role: Quad op-amp configured as precision instrumentation amplifier (gain = 100) and low-pass filter (10 Hz cutoff).

Use Value: 3 mV max V_io ensures ≤0.3°C measurement error in 0–100°C range; 1.3 MHz GBP supports stable filtering without phase margin loss.

Use Scenario: Converting NTC thermistor voltage divider outputs to MCU-compatible 0–3.3 V signals in HVAC control units.

IC Role / Device Role / Timing Role: Non-inverting amplifier (gain = 2) with ground-referenced input and rail-to-rail output.

Use Value: Input CMVR including ground eliminates need for bias resistors; 375 µA/amplifier enables always-on cabin monitoring with <1.5 mA total quiescent current.

IoT Node Analog Front-End

Programmable Gain Instrumentation

Use Scenario: Signal conditioning for battery-powered environmental sensors (CO₂, humidity, light) transmitting via BLE.

IC Role / Device Role / Timing Role: Four independent channels: two for sensor amplification, one for reference buffering, one for ADC driver.

Use Value: 375 µA/amplifier reduces average power to <1.5 mA; SO14 package supports automated optical inspection in high-volume assembly.

Use Scenario: Configurable gain stages in portable medical devices (e.g., ECG front-end with selectable 10×/100×/1000× gain).

IC Role / Device Role / Timing Role: Three op-amps in classic 3-op-amp IA topology; fourth used for active filtering.

Use Value: 100 dB open-loop gain ensures <0.1% gain error at G = 1000; 20 nA I_ib prevents loading of high-Z electrode interfaces.

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	Automotive-qualified (–40°C to 125°C), 700 V HBM ESD, 3 mV V_io max, same pinout	Required for AEC-Q100-compliant vehicle cabin modules	Select when extended temperature range and enhanced ESD robustness are mandatory
TSB572IPT	36 V supply, 0.8 µV/°C V_io drift, 1.8 MHz GBP, 120 dB CMRR, TSSOP14 only	Higher accuracy needed in precision weigh scales and lab equipment	Choose for improved DC stability and wider supply range where cost premium is acceptable

Compared with LM224N, LM2902DT offers automotive qualification and higher ESD tolerance but identical DC performance, while TSB572IPT delivers superior precision and bandwidth at higher cost and reduced temperature range (–40°C to 125°C).

Availability

LM224N is available at Aetrix Electronics and suitable for industrial automation, IoT sensor nodes, and consumer appliance control systems requiring stable component supply across SO14, TSSOP14, and QFN16 package variants.

Supply support for LM224N 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, specializing in microcontrollers, power management, analog ICs, and MEMS sensors.

The LM224x series belongs to ST's legacy precision analog portfolio, engineered for cost-sensitive industrial and consumer applications demanding reliable quad op-amp functionality with minimal external components.

FAQ

What is the maximum operating supply voltage for LM224N?

The absolute maximum supply voltage is 32 V for single-supply operation or ±16 V for dual supplies. Continuous operation above 30 V (single) or ±15 V (dual) risks exceeding thermal limits and degrading long-term reliability. Recommended operating range is 3 V to 30 V single supply, validated across all temperature grades.

Does LM224N support rail-to-rail input?

No - LM224N features rail-to-rail *output* swing but not rail-to-rail *input*. Its input common-mode voltage range extends from ground to V_CC–1.5 V. Inputs must remain ≥0 V and ≤(V_CC–1.5 V) to avoid phase reversal or increased offset errors.

Can LM224N drive capacitive loads directly?

Stable operation is guaranteed for capacitive loads ≤100 pF with 2 kΩ series resistance. Driving larger capacitive loads (e.g., ADC input capacitance >100 pF) requires isolation via a 20–100 Ω series resistor to prevent oscillation, as confirmed by Figure 10 (open-loop frequency response) and Figure 14 (small-signal pulse response) in DS0985 Rev 8.

How does LM224N differ from LM324N?

LM224N is rated for –40°C to +105°C operation, while LM324N operates from 0°C to +70°C. Both share identical electrical specifications and pinout, but LM224N is qualified for extended industrial environments such as factory-floor controllers and outdoor metering systems where ambient temperatures exceed 70°C.

LM224N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

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

Packaging:: Tube

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: -

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:: 40 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 30 V

Operating Temperature:: -25°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

LM224N FAQ

1.How can I place an order for LM224N through Aetrix?

Please submit a Request for Quotation (RFQ) for LM224N 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 LM224N reliable?

The price and inventory of LM224N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM224N is usually 5 days.

3.What payment methods are accepted for LM224N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM224N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM224N?

LM224N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM224N 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 LM224N?

For technical support, including LM224N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM224N requirements.

6.How does Aetrix verify that LM224N is sourced from the original manufacturer or authorized distributors?

All LM224N 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 LM224N meets industry standards.

7.What is the process for return or replacement of LM224N?

All LM224N units undergo pre-shipment inspection (PSI). If there is an issue with LM224N, 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 LM224N part is unused and in its original packaging.

Return procedure for LM224N:

1.Submit a request within 90 days.

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

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