LM224M - Quad 32V Op Amp in 14-SOP | onsemi
MPN: LM224M ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.0591 | $0.06 |
| 10 | $0.0591 | $0.59 |
| 100 | $0.0591 | $5.91 |
| 500 | $0.0591 | $29.55 |
| 1,000 | $0.0591 | $59.10 |
LM224M Overview
An operational amplifier is an analog signal-processing semiconductor that uses differential feedback to amplify the voltage difference between its two inputs while rejecting common-mode signals. The LM224M belongs to the hierarchy of operational amplifier, analog amplifier, linear integrated circuit, and semiconductor. Its internally compensated architecture allows stable operation as a unity-gain buffer without external frequency-compensation components, simplifying sensor, control, and signal-conditioning circuits.
Key features include four amplifiers in one package, true differential inputs, a 100 dB DC voltage gain, unity-gain frequency compensation, and supply operation from 3 V to 32 V. The ground-referenced input range is useful for battery-powered and single-supply systems in which signals remain near zero volts. Output swing ending near VCC minus 1.5 V should be considered when designing logic-level interfaces or driving heavier loads.
The LM224M is suitable for general-purpose industrial analog systems operating across a wider temperature range than commercial-grade LM324 variants, although the exact temperature limits and electrical limits must be confirmed from the selected manufacturer datasheet. It can provide input buffering, sensor amplification, error amplification, and low-frequency closed-loop signal conditioning when operated with suitable passive feedback networks.
Typical uses include temperature-sensor interfaces, process-control loops, current-sensing amplifiers, low-level transducers, instrumentation, and embedded analog subsystems. In a sensor circuit, the LM224M can amplify a small differential signal while its feedback network sets the closed-loop gain. In a control loop, it can amplify an error voltage while avoiding external compensation components, subject to stability and noise checks in the completed circuit.
When designing around the LM224M, keep input and feedback components close to the relevant pins, provide suitable supply bypassing, and verify the input common-mode range under every supply condition. Avoid assuming rail-to-rail input or output capability. The documented input range includes ground, but does not necessarily extend to the positive supply rail. Likewise, the maximum output swing is not equal to the positive rail because the specified upper limit is approximately VCC minus 1.5 V.
This product page synthesizes the verified LM224M package, supply-range, gain, compensation, input-range, and output-swing information with practical design guidance and source traceability. The included comparisons and alternatives are limited to parts that can be evaluated as same-package drop-in options; verify pinout, electrical limits, temperature range, and production status before substitution.
Drop-in alternatives for LM224M — 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 LM224M (same form factor and footprint) — differing in Package, Number of Amplifiers, Channel Architecture, Compensation, Frequency Compensation.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM224KAD
✅ Drop-In📋 Reference alternative (not in catalog)
LM224DR
✅ Drop-In📋 Reference alternative (not in catalog)
LM324M
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM324DR
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →LM2902M
✅ Drop-In✓ In Stock
$0.0527 / Unit
View Datasheet →LM224M Maximum Ratings & Electrical Characteristics
| Product Type | Quad operational amplifier |
| Number of Amplifiers | 4 circuits |
| Power Supply Range | 3 V to 32 V |
| DC Voltage Gain | 100 dB |
| Input Configuration | True differential inputs |
| Frequency Compensation | Internally compensated for unity gain |
| Input Common-Mode Voltage Range | Includes ground |
| Output Voltage Swing | Approximately 0 V to VCC - 1.5 V |
| Package | 14-SOP |
| Mounting Type | Surface mount |
| Channel Count | 4 |
LM224M 14-sop Pin Configuration Guide
Pin configuration for LM224M (14-sop 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 LM224M.
Refer to the datasheet for full pin configuration.
Typical Applications
LM224M is suitable for 6 applications: Temperature Sensor Interface, Industrial Process Control, Current Sensing Amplification, Low-Level Sensor Signal Conditioning, Embedded Analog Control System, Instrumentation and Test Equipment.
Temperature Sensor Interface
LM224M fits a low-frequency temperature-sensor interface because each channel provides true differential inputs and approximately 100 dB large DC voltage gain. The amplifier can amplify the small differential voltage produced by a resistive sensor bridge while the feedback resistors establish the closed-loop gain. Its input common-mode range includes ground, which is useful when the sensor signal is near the lower supply rail. The designer should still verify the exact common-mode range, offset, bias current, and bias network. Since the output swing is approximately 0 V to VCC minus 1.5 V, a suitable output range must be reserved for the following ADC or control stage. Supply bypassing and short feedback traces are essential at the 14-SOP pins.
Recommended
Industrial Process Control
LM224M can serve as an error amplifier in a process-control loop when the controller works with relatively slow analog signals. True differential inputs help reject common-mode voltage on long or noisy sensor connections, while the 100 dB large DC voltage gain supports high closed-loop amplification when paired with suitable feedback. The internally compensated architecture simplifies unity-gain buffer use, but control-loop stability must be checked with the actual sensor, actuator, filter, and compensation network. The 3 V to 32 V supply range permits use from low-voltage control electronics to higher-voltage industrial analog rails. Do not assume the output reaches the positive supply: the verified swing is approximately VCC minus 1.5 V, and the applied load can further reduce usable headroom.
Recommended
Current Sensing Amplification
LM224M is suitable for amplifying the differential voltage generated by a current-sense resistor in a low-frequency power measurement or protection circuit. The differential input structure is useful when the sense voltage is small relative to supply voltage, and the high DC gain allows the circuit to increase the signal before comparison or conversion. Feedback resistance and input filtering should be selected for the expected shunt impedance, while the resistor network must preserve the required common-mode range. Because the input range includes ground but is not stated as rail-to-rail, sense-node voltage and transients must remain inside the verified limits. Power dissipation in the sense resistor and the amplifier’s supply current should be estimated separately during thermal design.
Recommended
Low-Level Sensor Signal Conditioning
LM224M can condition outputs from resistive, capacitive, or low-level analog sensors when the signal bandwidth is modest. Four channels in one 14-SOP package can reduce package count for systems that need several similar conditioning paths. Use each channel with defined feedback and input bias networks, and keep the signal path short to minimize noise pickup. Internal unity-gain compensation makes buffered operation straightforward, but input bias current, offset voltage, and temperature drift should be obtained from the applicable datasheet before setting very high source impedances. The output headroom limitation of approximately 1.5 V below the positive rail must be included in the analog headroom budget, especially when driving an ADC, comparator, or transistor interface.
Recommended
Embedded Analog Control System
LM224M can provide the analog front end for a small embedded control system that measures a plant signal and drives a slow actuator. The microcontroller handles configuration and decision logic, while the LM224M handles amplification, buffering, and error amplification between sensors and control inputs. The 3 V minimum supply is convenient for low-voltage systems, while the upper verified limit of 32 V supports higher-voltage interface designs. Designers should separate sensitive signal ground from actuator-return currents, place bypass capacitors close to the supply pins, and verify startup behavior because the provided data does not specify input or output behavior during power transitions. The part should be treated as a general-purpose amplifier, not as a rail-to-rail precision device.
Recommended
Instrumentation and Test Equipment
LM224M is suitable for instrumentation buffers and low-frequency measurement front ends where true differential input behavior and multiple amplifier channels are useful. Four independent channels can support input conditioning, active filtering, or offsetting in a compact 14-SOP footprint. The verified 100 dB DC gain and internal unity-gain compensation are useful for precision-oriented signal paths, but actual measurement accuracy depends on resistor tolerances, input bias current, offset, noise, and temperature drift, all of which require confirmation from the selected manufacturer datasheet. Keep the differential pair routed together, use guarding where leakage matters, and ensure the output remains below VCC minus 1.5 V for the intended load. Calibration may be required after installation.
Recommended
Recommended Products Summary
Engineering reference data for LM224M — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM224KAD | LM224DR | LM324M | LM324DR | LM2902M |
|---|---|---|---|---|---|---|
| Package | 14-SOP | SOIC-14 | SOIC-14 | 14-SOP | SOIC-14 | 14-SOP |
| Brand | onsemi | Texas Instruments | Texas Instruments | onsemi | Texas Instruments | onsemi |
| Amplifier Count | 4 | 4 | 4 | 4 | 4 | 4 |
Key Differentiators
- Verified LM224M supply capability (vs LM224KAD)
- Single-package four-channel integration (vs LM324M)
- Ground-inclusive input operation (vs LM2902M)
Design Notes
The verified LM224M output swing is approximately 0 V to VCC minus 1.5 V, so design the analog signal and downstream logic with positive-rail headroom rather than assuming rail-to-rail output. At a 5 V supply, the upper nominal swing is approximately 3.5 V, subject to load and device limits. Use the actual supply voltage, load current, and temperature from the manufacturer datasheet when setting the maximum signal level.
Place supply-bypass capacitors close to the LM224M power and ground pins, and route each differential input pair together to minimize pickup and impedance mismatch. Keep feedback resistors and filter components near the associated amplifier pins rather than distributing them around the board. The 14-SOP footprint should be checked against the exact manufacturer package drawing before routing because the supplied results reference onsemi and historical Fairchild documentation.
Do not assume that the input range extends to the positive supply rail merely because the input range includes ground. Likewise, do not assume that internal unity-gain compensation makes every feedback topology ideal; stability, loading, noise, and output-current limits still depend on the completed circuit. Confirm offset voltage, input bias current, bandwidth, slew rate, quiescent current, and temperature limits before finalizing high-impedance or precision designs.
Compliance Information
The supplied verified results do not state compliance status for the onsemi LM224M. Confirm current manufacturer declarations for the exact ordering code and package.
