LM324AM - 4-Channel 3-32V Low-Power Op Amp | Texas Instruments
MPN: LM324AM ✓ ActiveLM324AM Overview
An operational amplifier is an analog signal-processing IC that amplifies the voltage difference between its inverting and non-inverting inputs. The LM324 belongs to the general-purpose operational-amplifier hierarchy: operational amplifier → voltage-feedback amplifier → integrated amplifier IC. Its four internal sections support common tasks including voltage buffering, transducer amplification, cross-coupled differential stages, analog filtering, and sensor-signal conditioning while operating from a single positive supply.
The principal advantages of the LM324AM are its low-power four-channel integration, 3 V to 32 V single-supply range, approximately 65 dB CMRR, and low-power characterization emphasized by distributors. The 14-pin SOIC format supports conventional surface-mount assembly, while the four amplifier channels can provide independent gain or buffering functions within one package. The listed operating-temperature range is 0 °C to 70 °C, matching a general-purpose commercial-temperature class rather than an explicitly automotive-qualified product.
The internally frequency-compensated architecture makes the LM324AM suitable for straightforward closed-loop amplifier configurations without external compensation networks. Designers should still verify input common-mode range, output swing, output-current capability, noise, slew rate, offset voltage, and channel behavior against the manufacturer datasheet for the exact production source and grade. Because LM324-family devices are also offered by multiple manufacturers, procurement should confirm the manufacturer marking, temperature grade, qualification status, and traceability.
Typical uses include industrial 4-20 mA current-loop receivers, low-voltage sensor amplifiers, audio preamplifier stages, active filters, and general analog control boards. The integrated quad format is particularly useful when four similar amplifier channels are required. For a single- or dual-channel design, however, a one- or dual-amplifier package can reduce unused channels, power consumption, and PCB area.
The principal design consideration is ensuring that the input and output operating points remain within the device's allowable common-mode and output-swing limits. Layout should keep feedback-loop connections short, provide local bypassing at the supply pins, and avoid placing high-current return paths beneath sensitive analog inputs. Stable operation near ground-level signals should be checked carefully when the source impedance is high or when the required output amplitude approaches the supply rails.
This page consolidates verified distributor and manufacturer information, package-level replacement guidance, practical layout notes, and parameter-by-parameter comparisons. It also distinguishes verified facts from specifications that require confirmation from the exact manufacturer datasheet, helping engineers select and qualify the LM324AM without relying on generic family assumptions.
Drop-in alternatives for LM324AM — 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 LM324AM (same form factor and footprint) — differing in Amplifier Type, Package, Architecture, Input Offset Voltage, Supply Voltage Range.
LM324D
✅ Drop-InContact for price
View Datasheet →LM324DG
✅ Drop-InContact for price
View Datasheet →LM324ADG
✅ Drop-In📋 Reference alternative (not in catalog)
LM224DR
✅ Drop-InContact for price
View Datasheet →LM324DR2G
✅ Drop-InContact for price
View Datasheet →LM324AM Maximum Ratings & Electrical Characteristics
| Amplifier Type | General-purpose operational amplifier |
| Number of Amplifier Channels | 4 channels |
| Supply Voltage Range | 3 V to 32 V |
| Maximum Output Current | 40 mA |
| Common-Mode Rejection Ratio | 65 dB |
| Package | 14-pin SOIC |
| Mounting Type | Surface mount |
| Operating Temperature Range | 0 °C to 70 °C |
| Architecture | Internally frequency compensated |
| Supply Type | Single supply |
LM324AM 14-pin soic Pin Configuration Guide
Pin configuration for LM324AM (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 LM324AM.
Refer to the datasheet for full pin configuration.
Typical Applications
LM324AM is suitable for 6 applications: Industrial 4-20 mA Current-Loop Receiver, Low-Power Sensor Signal Conditioning, Audio Preamplifier and Mixer, Active Analog Filter, Control-System Driver and Buffer, Portable Battery-Powered Instrumentation.
Industrial 4-20 mA Current-Loop Receiver
The LM324AM fits an industrial current-loop receiver because its four amplifier sections can implement several analog stages within one 14-pin SOIC, while its 3 V to 32 V supply range accommodates conventional 24 V process-control environments. The verified approximately 65 dB CMRR helps attenuate common-mode voltage present on a field-wired current signal. A practical design may use one channel for the loop input, one for filtering, one for scaling, and one for output buffering. Before finalizing the design, verify input bias current, input common-mode range, output swing, offset voltage, and stability with the selected manufacturer's exact datasheet, particularly when the transmitter output approaches the lower end of the supply range.
Recommended
Low-Power Sensor Signal Conditioning
The LM324AM is suitable for conditioning low-power sensor outputs where four channels provide gain, filtering, buffering, and offset stages without requiring four separate packages. Its single-supply operation from 3 V to 32 V supports both compact battery-operated equipment and higher-voltage industrial interfaces. The verified 65 dB CMRR can reduce correlated interference when the sensor is connected to a cable, while the four-section architecture reduces package count. Because sensor accuracy can be limited by input bias current and offset voltage, the design must confirm those parameters from the exact producer datasheet. High source impedances may also require guarding, shielding, or a lower-bias-current amplifier if leakage becomes significant.
Recommended
Audio Preamplifier and Mixer
The LM324AM can implement four low-power preamplifier or mixing channels in audio equipment because each section is an independently usable general-purpose operational amplifier. Its 3 V minimum supply supports single-cell-derived rails after suitable regulation, and the four-channel SOIC simplifies board partitioning compared with separate dual and single packages. Verified specifications of approximately 65 dB CMRR can help reject common-mode pickup on source connections, while the 14-pin surface-mount format supports automated assembly. Audio-band performance still depends on the manufacturer's noise, gain-bandwidth, slew-rate, output-swing, and output-current ratings. Those values must be verified before the LM324AM is used in a bandwidth-critical or low-noise audio signal path.
Recommended
Active Analog Filter
The LM324AM is well suited to first-order and basic higher-order active filters when four amplifier sections can implement cascaded or parallel signal-processing blocks in one package. The internally compensated four-channel architecture simplifies filter construction, and the 3 V to 32 V single-supply range permits different source and sink levels across industrial and embedded designs. A practical advantage is that one compact 14-pin SOIC replaces several small amplifier packages, reducing board area and assembly count. Filter design must account for exact gain-bandwidth, slew-rate, output-swing, common-mode-range, and load-capability limits from the selected manufacturer's datasheet. Component tolerances and amplifier offset can also influence cutoff accuracy, particularly for narrow-band or precision filters.
Recommended
Control-System Driver and Buffer
The LM324AM can provide four buffering or drive stages for a control board, including reference conditioning, error-amplifier support, actuator-signal interfaces, and output isolation. Its four amplifier channels in one 14-pin SOIC simplify multi-axis or multi-stage control layouts, while the verified maximum output current of 40 mA provides a defined basis for load-current assessment. The wide 3 V to 32 V single-supply range also supports direct interface to many 5 V, 12 V, and 24 V system rails. The output current is sufficient for many analog signal loads but not for driving motors or high-current relays; those loads require an external driver stage. Verify output swing, capacitive-load behavior, stability, and thermal dissipation in the exact application.
Recommended
Portable Battery-Powered Instrumentation
The LM324AM is applicable to portable instrumentation that needs several low-power analog channels and can operate from a 3 V or higher single supply. Four sections can handle sensor amplification, filtering, baseline adjustment, and output buffering in a compact surface-mount footprint. The distributor classification of the LM324AM as a low-power general-purpose quad amplifier makes it relevant to battery-powered data-acquisition and field-measurement systems where minimizing the number of active packages is valuable. The total board-level power budget should include both the amplifier quiescent current and signal-dependent activity because those detailed values are not included in the verified excerpts. Input leakage, offset, common-mode range, and output headroom must also be checked before using a high-impedance sensor near the supply rails.
Recommended
Recommended Products Summary
Engineering reference data for LM324AM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM324D | LM324DG | LM324ADG | LM224DR | LM324DR2 |
|---|---|---|---|---|---|---|
| Package | 14-SOIC | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same | 14-SOIC - same |
| Brand | Texas Instruments | Texas Instruments | onsemi | onsemi | Texas Instruments | onsemi |
| Number of Amplifier Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount |
Key Differentiators
- Four general-purpose amplifier channels in one 14-pin SOIC (vs LM324D)
- Single-supply operating range covers 3 V to 32 V (vs LM324DG)
- Verified common-mode rejection of approximately 65 dB (vs LM224DR)
- Four-channel integration reduces package count (vs LM324ADG)
Design Notes
Keep each amplifier's feedback components adjacent to the corresponding input and output pins, and route the feedback loop away from the device power pins and other high-current switching paths. A compact SOIC-14 layout is particularly important because long feedback traces can pick up noise and increase susceptibility to parasitic coupling. Use a solid ground reference and avoid routing sensitive inputs directly beneath the package or adjacent to supply and output-current paths.
Place the device's supply bypass capacitor close to the supply and ground terminals. The exact capacitance and stability requirements must be confirmed from the manufacturer datasheet for the selected LM324AM source, so do not substitute a generic value without checking input-voltage and output-capacitance conditions. Verify the available input headroom at the lowest supply voltage and maximum operating temperature because these requirements can reduce usable output range.
Do not assume that every LM324-family ordering code has identical temperature, qualification, offset, or sourcing conditions. The verified excerpts identify multiple manufacturers offering LM324-family devices, including Texas Instruments, Fairchild Semiconductor, and onsemi. Before substitution or release, compare the exact manufacturer datasheet, pin names, package drawing, temperature range, and approved-vendor requirements.
For high-impedance sensors, minimize leakage into the input node, use guarding where appropriate, and account for input bias current when selecting source and feedback resistors. The verified 65 dB CMRR helps with common-mode rejection but does not remove errors caused by offset, bias current, or common-mode-range limitations. Confirm those parameters for the exact producer before using the device at very low signal levels.
The verified maximum output current is 40 mA, but continuous analog operation normally dissipates much less. Check the actual output-current, supply-voltage, and output-voltage conditions to estimate dissipation, then use the manufacturer's thermal information for the SOIC assembly. Keep adequate copper around the package and avoid placing the amplifier next to a heat source unless its temperature rating and verified thermal data support the design.
Compliance Information
The supplied search excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for the exact Texas Instruments LM324AM. These values require confirmation from the current manufacturer declaration for the selected producer and date code.