LM324M - Low-Power Quad Op Amp | Texas Instruments
MPN: LM324M ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LM324M Overview
An operational amplifier is an analog signal-processing IC that uses high open-loop gain to amplify the difference between two inputs. Negative feedback establishes a stable closed-loop gain and bandwidth. The LM324 family belongs to the broader quad-operational-amplifier hierarchy: operational amplifier, analog amplifier, linear amplifier, and integrated circuit. Its four internally compensated channels can amplify AC or DC signals when supported by suitable biasing, decoupling, feedback, and output-loading conditions.
The principal feature of LM324M is integration. Four amplifiers in one 14-pin SOIC reduce package count and simplify common dual-rail or single-supply analog boards. Internal frequency compensation means each channel does not require a separate compensation network for ordinary closed-loop operation. The verified manufacturer result specifically describes LM324 as low-power and optimized for single-supply operation, while the distributor result classifies LM324M as a standard general-purpose instrumentation and buffer amplifier.
The four channels are intended for independent signal-conditioning tasks. Typical functions include noninverting and inverting amplification, voltage buffering, active filtering, cross-coupled analog networks, and sensor-signal conditioning. Internal compensation supports unity-gain buffer use, but stability, output swing, input common-mode range, slew rate, noise, and usable bandwidth must be checked against the actual circuit. A low-power general-purpose amplifier may not be suitable when very wide bandwidth, very low offset, low noise, rail-to-rail input/output, or high capacitive-drive capability is required.
A practical single-supply design must establish a suitable input common-mode voltage and output bias point. Bypass the power pin close to the IC, route traces to avoid feedback around unintended paths, and avoid excessive capacitive loading on an output. Because the provided search result does not include verified temperature, RoHS, REACH, or package-dimension details, those specifications should be taken from the official LM324 documentation before release to production.
Typical uses include low-frequency sensor conditioning, buffered instrumentation, active filters, classroom electronics, industrial control blocks, and general analog signal chains. This page summarizes the verified product identity and package, provides practical design guidance, distinguishes confirmed facts from missing ratings, and directs buyers to the official product page for complete electrical and qualification data.
Drop-in alternatives for LM324M — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM324M (same form factor and footprint) — differing in Package, Slew Rate, Input Offset Voltage, Amplifier Type, Gain Bandwidth Product.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM324M
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM2904D
✅ Drop-In✓ In Stock
$0.1 / Unit
View Datasheet →LM324ADR2G
✅ Drop-In✓ In Stock
$0.18 / Unit
View Datasheet →LM324DT
✅ Drop-In✓ In Stock
$0.0827 / Unit
View Datasheet →LM324DR2G
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$0.21 / Unit
View Datasheet →LM324M Maximum Ratings & Electrical Characteristics
| Product Type | Quad operational amplifier |
| Number of Amplifiers | 4 circuits |
| Channel Architecture | Four independent amplifiers |
| Compensation | Internally frequency compensated |
| Power Supply Architecture | Single-supply operation across a wide voltage range |
| Product Class | Standard general-purpose amplifier |
| Typical Functions | Instrumentation, signal amplification, and buffering |
| Package | 14-pin SOIC |
| Mounting Type | Surface mount |
| Pin Count | 14 pins |
LM324M 14-pin soic Pin Configuration Guide
Pin configuration for LM324M (14-pin soic package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LM324M.
Refer to the datasheet for full pin configuration.
Typical Applications
LM324M is suitable for 6 applications: General-Purpose Signal Buffering, Sensor Signal Conditioning, Active Low-Frequency Filters, Industrial Control and Instrumentation, Audio and Low-Frequency Amplification, Educational and Prototype Analog Circuits.
General-Purpose Signal Buffering
LM324M is suitable for general-purpose buffering when four low-power amplifier channels are needed on a compact analog board. The four independent, internally frequency-compensated amplifiers in the 14-SOIC package let a design assign separate channels to sensor outputs, reference nodes, or intermediate signals. Because the verified data does not provide exact input common-mode range, output swing, or capacitive-drive limits, the circuit should keep signal levels within the official datasheet limits. This use is most appropriate for low-frequency, moderate-precision applications rather than demanding high-speed or rail-to-rail signal chains. Place the IC close to the bypass capacitor and route short, quiet traces to reduce noise pickup.
Recommended
Sensor Signal Conditioning
LM324M can condition low-frequency outputs from resistive, capacitive, or other analog sensors when the system accepts a general-purpose amplifier rather than a precision or rail-to-rail device. Its four internal amplifier channels provide a convenient way to amplify one or more sensor signals while sharing a common supply architecture. The designer must establish a bias point that keeps inputs and outputs inside the verified common-mode and output-swing limits, which are not included in the supplied excerpts. Check offset voltage and input bias current in the manufacturer datasheet because sensor accuracy can be affected by those parameters. Decouple the supply near the IC and keep sensor returns away from switching nodes.
Recommended
Active Low-Frequency Filters
LM324M can serve as the active element in low-frequency filters, such as first-order or modest higher-order analog stages, where its internally compensated amplifier behavior is useful. Four channels allow multiple stages or parallel signal paths without requiring four separate packages. The exact gain-bandwidth product and slew rate must be verified before setting the crossover frequency, and output loading should remain within the official device limits. Resistor and capacitor tolerances should be selected carefully because passive-component variation can dominate filter response. Place feedback components close to their assigned amplifier pins and provide a stable ground reference to avoid converting common-impedance noise into filter distortion.
Recommended
Industrial Control and Instrumentation
LM324M is applicable to low-frequency industrial control and instrumentation blocks where a low-power, general-purpose quad amplifier is sufficient. It can support input conditioning, error amplification, current-loop interfaces, or signal isolation between stages, provided the power rail and signal levels remain compatible with the verified datasheet limits. The supplied source does not state industrial temperature or AEC-Q100 qualification, so those requirements must be checked before deployment. Use a clean low-noise supply, provide local bypass capacitance, and keep high-current outputs and switching edges physically separated from sensitive amplifier inputs. Prototype first when driving long cables or capacitive loads.
Recommended
Audio and Low-Frequency Amplification
LM324M can be used in low-frequency audio preamplifier or line-stage circuits when its noise, offset, bandwidth, and output capabilities meet the system requirements. The four amplifier channels enable stereo or multi-channel preamplification, and the internal frequency compensation supports conventional closed-loop configurations. The supplied data does not provide output-current, slew-rate, noise, or maximum-output-voltage ratings, so headphone or line-driver use must not be assumed. Confirm those specifications, use appropriate output coupling or biasing, and keep the signal path away from switching supplies. A protection network may be needed when the output connects to a load with capacitance or a lower impedance.
Recommended
Educational and Prototype Analog Circuits
LM324M is well suited to educational, laboratory, and prototype analog circuits because it packages four general-purpose amplifier channels in a standard 14-pin SOIC. Students can use separate channels for noninverting amplifiers, inverting amplifiers, buffers, or basic active-filter experiments while learning single-supply biasing and negative feedback. Since the verified excerpts do not supply the complete electrical limits, prototypes should begin at low supply voltages and low signal amplitudes. Check the official pinout before wiring and include adequate supply bypassing. Prototype boards also make it easier to compare alternative resistor values and observe saturation behavior before committing to a production layout.
Recommended
Engineering reference data for LM324M — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2904D | LM324ADR | LM324DT | LM324DR2G |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Package | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
Key Differentiators
- Four integrated amplifier channels (vs LM324DT)
- Single-supply general-purpose positioning (vs LM324ADR)
- Internally compensated architecture (vs LM2904D)
Design Notes
Design the single-supply bias network before connecting inputs or outputs. The verified TI description confirms single-supply operation, but the supplied excerpts do not state the exact input common-mode range or output swing. Establish a reference point that keeps every signal inside those limits, especially when the input is centered near ground. Place the supply bypass capacitor close to the relevant power pin and return its ground connection to the same quiet reference used by the analog signals.
Keep each amplifier's feedback resistors, input traces, and bypass connections compact. Four independent channels can be used in separate analog functions, but crossing a sensitive input under a switching or high-current output trace may introduce coupling. Route ground as a low-impedance reference and avoid long loops around the amplifier inputs. If the SOIC part is placed near a connector or power converter, place the IC and passive network on the quieter side of the board-planning boundary.
Do not assume that every LM324-family suffix is interchangeable. LM324M, LM324ADR, LM324DT, and LM324DR2G may represent different manufacturers, package details, or ordering grades even when the family name appears similar. Verify the exact pinout, supply range, temperature grade, offset specifications, and output-drive requirements before replacing the original. Also confirm the selected package footprint against the manufacturer's recommended land pattern rather than relying only on the family name.
Compliance Information
Compliance fields remain unknown because the supplied verified excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Obtain the exact manufacturer declaration or product documentation before making a compliance claim.
