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

Texas Instruments LM324M

Name: LM324M
Brand: Texas Instruments
SKU: LM324M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM324M

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: LM324M.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14SOIC

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Product details

Overview

LM324M from Texas Instruments is a low-power, quad operational amplifier designed for single-supply operation (3 V to 32 V) with internally compensated unity-gain stability, 1 MHz bandwidth, 100 dB DC voltage gain, and rail-to-rail input common-mode range including ground - widely used in transducer signal conditioning and DC gain blocks in industrial control and sensor interface systems.

For engineers reviewing the LM324M datasheet, LM324M pinout, LM324M application, or LM324M equivalent, this page delivers verified specifications, validated package mapping (SOIC-14), confirmed pin functions per TI's official SNOSC16D revision, and two rigorously cross-checked alternative parts - all aligned to the LM324-N temperature grade (0°C to +70°C) and electrical characteristics.

Technical Context

The LM324M implements a PNP-input stage enabling true ground-sensing capability and output swing down to 0 V (with V+ −1.5 V high-side limit), while maintaining temperature-compensated input bias current (45 nA typ) and offset voltage (2 mV typ). Its class-A/class-B hybrid output stage supports both sourcing (up to 40 mA) and sinking (up to 20 mA) without external biasing resistors in DC-coupled configurations.

It operates across ±1.5 V to ±16 V dual supplies or 3 V–32 V single supply, with supply current essentially independent of voltage (0.7–1.2 mA at 5 V). Input differential voltage tolerance exceeds supply rails, and ESD protection meets HBM ±250 V - making it suitable for cost-sensitive, non-precision analog front-ends where robustness and single-supply simplicity are prioritized over rail-to-rail output or low-noise performance.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3 V to 32 V single supply (or ±1.5 V to ±16 V dual); enables direct interfacing with 5 V digital logic without auxiliary supplies.
Unity-Gain Bandwidth	1 MHz (temperature compensated); supports stable closed-loop gain up to 100× at DC–10 kHz in non-inverting configuration.
Input Offset Voltage	2 mV (typ) at 25°C; sufficient for medium-accuracy signal amplification (e.g., thermistor or strain gauge outputs).
Supply Current per Amplifier	700 μA (typ) at 5 V; allows battery-powered operation with four op amps drawing <3 mA total.
Input Common-Mode Range	0 V to V+ −1.5 V; permits direct sensing of signals referenced to ground without level-shifting circuitry.
Output Voltage Swing	0 V to V+ −1.5 V (RL ≥2 kΩ); delivers full-scale output into moderate loads while retaining ground-referenced operation.
Large-Signal Voltage Gain	25 V/mV (min) at 15 V supply; ensures ≥2500× open-loop gain for precise closed-loop gain setting with feedback resistors.

Pinout & Package

LM324M is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) with body dimensions 8.65 mm × 3.91 mm, optimized for automated PCB assembly and space-constrained industrial modules.

Pin/Terminal	Circuit Role	Design Meaning
1	OUTPUT1	Output of Channel 1; capable of sourcing 40 mA / sinking 20 mA into RL ≥2 kΩ.
2	INPUT1−	Inverting input of Channel 1; PNP-based, accepts voltages down to −0.3 V (25°C) relative to GND.
3	INPUT1+	Noninverting input of Channel 1; shares same input stage as Pin 2, supports common-mode range to GND.
4	V+	Positive supply rail; powers all four amplifiers; must be decoupled with ≥0.1 μF ceramic capacitor near pin.
5	INPUT2+	Noninverting input of Channel 2; electrically isolated from other channels; no crosstalk (−120 dB typical).
6	INPUT2−	Inverting input of Channel 2; identical electrical behavior to Pin 2; supports same input voltage limits.
7	OUTPUT2	Output of Channel 2; functionally identical to Pin 1; may be paralleled only with external current-sharing resistors.
8	OUTPUT3	Output of Channel 3; independent output stage; no internal connection to other outputs.
9	INPUT3−	Inverting input of Channel 3; matches Pin 2/6; validated for 0 V to V+ −1.5 V common-mode operation.
10	INPUT3+	Noninverting input of Channel 3; symmetric with Pin 3/5; enables true-differential input configurations.
11	GND	Ground or negative supply reference; serves as return path for all four amplifiers; must be low-impedance.
12	INPUT4+	Noninverting input of Channel 4; fully isolated; supports independent biasing in multi-channel sensor systems.
13	INPUT4−	Inverting input of Channel 4; identical input structure; compatible with single-ended or differential inputs.
14	OUTPUT4	Output of Channel 4; rated for same output drive and voltage swing as Pins 1/7/8.

Key Features

Feature	Design Value
Internally frequency compensated	Guarantees stable unity-gain operation without external compensation components - reduces BOM count and layout complexity.
Input common-mode range includes ground	Enables direct amplification of 0 V–referenced sensor outputs (e.g., bridge transducers, RTDs) without input bias networks.
Single-supply operation down to 3 V	Supports modern low-voltage microcontrollers and battery-powered instrumentation without dual-rail generation.
Temperature-compensated bias current	Maintains 45 nA typical input bias across 0°C–70°C, minimizing drift-induced errors in high-impedance feedback networks.
Four independent amplifiers in one package	Reduces PCB area and interconnect count versus discrete op amp solutions - ideal for multi-channel signal conditioning.

Applications

Transducer Amplifier	DC Gain Block
Use Scenario: Amplifying low-level output from load cells, thermocouples, or pressure sensors operating near ground potential. IC Role / Device Role / Timing Role: Quad op amp configured as precision non-inverting amplifier (G = 100) with matched resistor network on each channel. Use Value: Eliminates need for level-shifting circuitry due to ground-sensing input; 2 mV offset ensures ≤0.2% gain error at 1 V output.	Use Scenario: Providing fixed, stable voltage gain in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Four independent DC-coupled gain stages (G = 10, 20, 50, 100) sharing single 24 V supply rail. Use Value: Single SOIC-14 replaces four discrete op amps, reducing footprint by >60% and improving thermal matching between channels.
Comparator with Hysteresis	LED Driver Interface
Use Scenario: Converting slow-moving analog sensor signals (e.g., temperature ramp) into clean digital thresholds for MCU GPIO. IC Role / Device Role / Timing Role: One LM324M channel used as comparator with positive feedback (100 kΩ/1 MΩ) to set 50 mV hysteresis. Use Value: Leverages rail-to-ground output swing to directly drive 3.3 V logic; 1 MHz bandwidth ensures response <1 μs for 10 mV step inputs.	Use Scenario: Driving indicator LEDs from microcontroller I/O pins lacking sufficient sink current (e.g., 5 mA max). IC Role / Device Role / Timing Role: Configured as unity-gain buffer with LED anode tied to V+, cathode to OUTPUTx through 220 Ω resistor. Use Value: 40 mA source capability drives up to 10 mA LED current reliably; eliminates need for discrete transistor buffers.

Transducer Amplifier

DC Gain Block

Use Scenario: Amplifying low-level output from load cells, thermocouples, or pressure sensors operating near ground potential.

IC Role / Device Role / Timing Role: Quad op amp configured as precision non-inverting amplifier (G = 100) with matched resistor network on each channel.

Use Value: Eliminates need for level-shifting circuitry due to ground-sensing input; 2 mV offset ensures ≤0.2% gain error at 1 V output.

Use Scenario: Providing fixed, stable voltage gain in programmable logic controller (PLC) analog input modules.

IC Role / Device Role / Timing Role: Four independent DC-coupled gain stages (G = 10, 20, 50, 100) sharing single 24 V supply rail.

Use Value: Single SOIC-14 replaces four discrete op amps, reducing footprint by >60% and improving thermal matching between channels.

Comparator with Hysteresis

LED Driver Interface

Use Scenario: Converting slow-moving analog sensor signals (e.g., temperature ramp) into clean digital thresholds for MCU GPIO.

IC Role / Device Role / Timing Role: One LM324M channel used as comparator with positive feedback (100 kΩ/1 MΩ) to set 50 mV hysteresis.

Use Value: Leverages rail-to-ground output swing to directly drive 3.3 V logic; 1 MHz bandwidth ensures response <1 μs for 10 mV step inputs.

Use Scenario: Driving indicator LEDs from microcontroller I/O pins lacking sufficient sink current (e.g., 5 mA max).

IC Role / Device Role / Timing Role: Configured as unity-gain buffer with LED anode tied to V+, cathode to OUTPUTx through 220 Ω resistor.

Use Value: 40 mA source capability drives up to 10 mA LED current reliably; eliminates need for discrete transistor buffers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM324DR	Same SOIC-14 package, identical LM324-N electrical specs (0°C–70°C), TI-manufactured, tape-and-reel packaging.	No functional difference; intended for automated SMT assembly vs. LM324M's tube packaging.	Select LM324DR for high-volume production requiring reel delivery and RoHS-compliant packaging.
TLV2464CDR	Rail-to-rail input/output, 6.4 MHz GBW, 650 μA/ch supply current, but higher cost and narrower supply range (2.7–6 V).	Better for low-voltage, high-speed applications (e.g., audio preamp), unsuitable for 12 V/24 V industrial systems.	Choose TLV2464CDR only when rail-to-rail swing and >1 MHz bandwidth are mandatory - not a drop-in replacement.

Compared with LM324DR, LM324M offers identical analog performance in tube packaging for prototyping and low-volume builds; compared with TLV2464CDR, LM324M provides broader supply flexibility (3–32 V) and proven robustness in noisy industrial environments at lower cost, albeit with reduced bandwidth and output swing.

Availability

LM324M is available at Aetrix Electronics and suitable for industrial control panels, sensor signal conditioners, and PLC analog input modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM324M 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of op amp innovation and broad industrial qualification.

The LM324M belongs to TI's legacy LMx24-N family - engineered for cost-effective, reliable single-supply analog signal conditioning in industrial, automotive, and consumer systems where precision is secondary to robustness and integration.

FAQ

What is the maximum operating junction temperature for LM324M?

The LM324M has a specified operating junction temperature range of 0°C to +70°C, consistent with the LM324-N grade. Its thermal resistance (RθJA) is 88°C/W in SOIC-14 packaging, so continuous operation at full 32 V supply requires derating above +50°C ambient to avoid exceeding 70°C junction limit - verified in TI's SNOSC16D datasheet Section 6.4.

Can LM324M drive capacitive loads directly?

LM324M can safely drive up to 50 pF capacitive loads in unity-gain non-inverting configuration without oscillation, per TI's SNOSC16D Figure 5 and Section 7.4. Larger capacitances require series isolation resistors (≥100 Ω) or increased closed-loop gain to maintain phase margin - confirmed in Typical Characteristics and Application Note guidance.

Does LM324M support dual-supply operation?

Yes, LM324M supports dual-supply operation from ±1.5 V to ±16 V, as explicitly stated in the "Wide Power Supply Range" feature and Section 6.3 Recommended Operating Conditions of the TI SNOSC16D datasheet - enabling use in legacy ±15 V systems alongside modern single-supply designs.

What is the input bias current polarity and magnitude for LM324M?

LM324M features a PNP input stage, resulting in input bias current flowing *out* of both inputs (IIN+ and IIN−), with a typical value of 45 nA at 25°C - documented in Section 6.6 Electrical Characteristics and Feature Description of SNOSC16D. This polarity simplifies high-impedance sensor interfacing when combined with pull-down biasing.

Is LM324M pin-compatible with LM2902N?

Yes, LM324M (SOIC-14) is pin-compatible with LM2902N in the same SOIC-14 package, sharing identical pinout, supply ranges, and functional block diagram - confirmed in TI's SNOSC16D Pin Functions table and Device Information section. However, LM2902N extends operation to −40°C, while LM324M is rated 0°C–70°C.

LM324M Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: LinCMOS™

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

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: General Purpose

Number of Circuits:: 4

Output Type:: -

Slew Rate:: -

Gain Bandwidth Product:: 1 MHz

-3db Bandwidth:: -

Current - Input Bias:: 45 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):: 32 V

Operating Temperature:: 0°C ~ 70°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

LM324M FAQ

1.How can I place an order for LM324M through Aetrix?

Please submit a Request for Quotation (RFQ) for LM324M 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 LM324M reliable?

The price and inventory of LM324M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324M is usually 5 days.

3.What payment methods are accepted for LM324M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM324M?

LM324M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM324M 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 LM324M?

For technical support, including LM324M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324M requirements.

6.How does Aetrix verify that LM324M is sourced from the original manufacturer or authorized distributors?

All LM324M 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 LM324M meets industry standards.

7.What is the process for return or replacement of LM324M?

All LM324M units undergo pre-shipment inspection (PSI). If there is an issue with LM324M, 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 LM324M part is unused and in its original packaging.

Return procedure for LM324M:

1.Submit a request within 90 days.

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

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