LM224AN - 30V Quad Op Amp, 1.2MHz | Texas Instruments
Référence : LM224AN ✓ ActifLM224AN Présentation
An operational amplifier is a high-gain, analog differential-input amplifier intended for feedback-based signal conditioning. The LM224 belongs to the operational-amplifier hierarchy within analog and linear integrated circuits. Internally compensated amplifiers simplify closed-loop design because no external compensation network is required for ordinary unity-gain or inverting-amplifier configurations. Single-supply operation permits the output to approach ground, while split-supply operation supports bipolar signal processing around a zero-volt reference.
The LM224AN provides four amplifiers in one 14-pin PDIP package, helping reduce board area compared with four individual single amplifiers. Its specified unity-gain bandwidth of 1.2 MHz supports moderate-frequency signal conditioning, while internally distributed compensation permits operation without an external frequency-compensation capacitor. The 3 mV offset specification characterizes the input mismatch that can appear as a DC error in high-gain feedback configurations. A 30 V maximum supply rating accommodates higher-voltage industrial and legacy analog systems when operating constraints and dissipation are properly evaluated.
The device is suitable for audio tone control, analog signal conditioning, sensor interfaces, control loops, and general instrumentation. Four independent channels allow an instrumentation amplifier, instrumentation signal-conditioning stage, multi-axis sensor interface, or four-channel measurement circuit to use one package. The PDIP package also facilitates prototyping, inspection, and replacement during maintenance because its leads are accessible and compatible with conventional through-hole assembly methods.
When designing with the LM224AN, confirm the actual operating supply voltage, load current, input common-mode range, output swing, and thermal dissipation under worst-case conditions. Input and output stability depend on load capacitance and source resistance, so breadboard and long-lead prototypes should be checked with an oscilloscope before production. Decoupling capacitors should be placed close to the supply and ground pins to limit supply ripple and prevent unintended feedback through board parasitics.
This page consolidates verified manufacturer and distributor information, same-package drop-in alternatives, specification comparisons, and practical design guidance. It distinguishes documented LM224AN facts from parameters that still require confirmation from the manufacturer datasheet, helping engineers evaluate replacements without treating every electrically similar amplifier as a guaranteed drop-in substitute.
Alternatives de remplacement direct pour LM224AN — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM224AN (même facteur de forme et même empreinte) — différant par Maximum Supply Voltage, Package.
LM324AN
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →LM2902AN
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LM224AN
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM224AN
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →LM124AN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM224AN Valeurs maximales et caractéristiques électriques
| Number of Amplifiers | 4 channels |
| Amplifier Type | Single general-purpose operational amplifier |
| Maximum Supply Voltage | 30 V |
| Unity-Gain Bandwidth | 1.2 MHz |
| Input Offset Voltage | 3 mV |
| Compensation | Internally compensated |
| Supply Configuration | Single or split supply |
| Plage de température de fonctionnement | -25°C to +85°C |
| Boîtier | 14-pin PDIP (N) |
| Nombre de broches | 14 pins |
| Type de montage | Through-hole |
| Statut RoHS | unknown |
| REACH Status | unknown |
Configuration des broches de LM224AN
| Broche 1 | OUT1 — Output of amplifier 1 |
| Broche 2 | IN1− — Inverting input of amplifier 1 |
| Broche 3 | IN1+ — Non-inverting input of amplifier 1 |
| Broche 4 | GND — Ground connection |
| Broche 5 | IN2+ — Non-inverting input of amplifier 2 |
| Broche 6 | IN2− — Inverting input of amplifier 2 |
| Broche 7 | OUT2 — Output of amplifier 2 |
| Broche 8 | OUT3 — Output of amplifier 3 |
| Broche 9 | IN3− — Inverting input of amplifier 3 |
| Broche 10 | IN3+ — Non-inverting input of amplifier 3 |
| Broche 11 | GND — Ground connection |
| Broche 12 | IN4+ — Non-inverting input of amplifier 4 |
| Broche 13 | IN4− — Inverting input of amplifier 4 |
| Broche 14 | OUT4 — Output of amplifier 4 |
Applications typiques
LM224AN convient pour 6 applications: Industrial Sensor Signal Conditioning, Audio Tone Control, Instrumentation and Measurement Front Ends, Power Supply Feedback and Control Loops, Legacy Communication Interface Conditioning, Test and Measurement Equipment.
Industrial Sensor Signal Conditioning
The LM224AN fits industrial sensor interfaces that need four independent analog channels, a 1.2 MHz unity-gain bandwidth, and operation from a single or split supply. Four amplifiers can condition current, voltage, resistance, and position-sensor outputs without requiring four separate packages. The 30 V maximum supply rating provides headroom for legacy 24 V industrial systems, while the internally compensated architecture avoids an external compensation network. The DIP-14 package is particularly convenient for panel and laboratory prototyping. Confirm the common-mode input range, output swing, source impedance, and offset error before selecting the device for high-accuracy measurements.
Recommandé
Audio Tone Control
The LM224AN can implement four stages of audio tone control, buffering, or mixing support when the signal bandwidth remains well below its 1.2 MHz unity-gain bandwidth. Independent channels allow bass, treble, gain, and output stages to share one package, while the internally compensated amplifier simplifies passive-feedback equalizer layouts. The 30 V supply rating supports conventional ±15 V audio rails, although output swing and distortion must be checked at the selected load. For low-impedance headphone or loudspeaker output, add an appropriate output stage because the LM224AN is a general-purpose voltage-feedback amplifier rather than a dedicated power driver.
Recommandé
Instrumentation and Measurement Front Ends
The LM224AN supports four-channel measurement front ends where moderate-bandwidth amplification is sufficient. Its four independent amplifiers can form non-inverting, inverting, difference, and summing stages for laboratory and industrial measurement systems. The 1.2 MHz unity-gain bandwidth handles signals from slow sensors through some low-frequency communication waveforms, while the 3 mV input offset specification must be included in the total error budget. For precision bridge or instrumentation measurements, verify input bias current and offset across temperature because the confirmed operating range is -25°C to +85°C.
Recommandé
Power Supply Feedback and Control Loops
The LM224AN can supervise a regulated power rail, amplify a remote-sensing signal, or implement error-amplifier functions in legacy control loops. Its four channels allow a single package to provide voltage feedback, current feedback, enable comparison, and fault conditioning. The 30 V maximum supply rating is useful for 12 V or 24 V industrial rails, provided the amplifier does not exceed its allowed common-mode and output ranges. Stability must be verified with realistic compensation values and load conditions, especially if the loop controls a switching converter whose output ripple and phase response differ from laboratory test results.
Recommandé
Legacy Communication Interface Conditioning
The LM224AN is suitable for low-rate communication-interface conditioning where the signal bandwidth is below 1.2 MHz and legacy single-supply operation is required. Four channels can condition receive signals, shape logic transitions, amplify level-shifted outputs, and provide active filtering. Single-supply operation can simplify systems where the signal lies near the lower rail, but the output-swing and input common-mode limits must be checked because the verified material does not provide those values. For RS-232 level translation, use a dedicated transceiver such as MAX232DR alongside the LM224AN rather than relying on the amplifier alone.
Recommandé
Test and Measurement Equipment
The LM224AN fits general-purpose test and measurement equipment that needs several buffered analog channels. It can amplify attenuator outputs, buffer sensor inputs, implement active filters, and drive high-impedance measurement stages. The internally compensated design reduces external component count, while 1.2 MHz bandwidth is adequate for many low-frequency laboratory functions rather than high-speed instrumentation. The 14-pin PDIP package simplifies repair and prototype construction. For instrument-grade accuracy, account for the 3 mV input offset and verify drift, noise, bias current, common-mode range, and output drive against the measurement specification.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM224AN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM324AN | LM2902AN | LM224AN | LM224AN | LM124AN |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | onsemi | Analog Devices |
| Package | 14-pin PDIP (N) | 14-pin PDIP (N) | 14-pin PDIP (N) | 14-pin PDIP (N) | 14-pin PDIP (N) | 14-pin PDIP (N) |
Principaux différenciateurs
- Confirmed extended commercial-temperature option (vs LM324AN)
- Four channels in one through-hole package (vs LM224AN from STMicroelectronics)
- Internally compensated architecture simplifies implementation (vs LM124AN)
- 30 V supply and 1.2 MHz bandwidth combination (vs LM2902AN)
Notes de conception
Place the supply-bypass capacitor between the appropriate supply and ground pins as close to the package as practical. In a split-supply circuit, provide local bypass on both supply rails; in a single-supply circuit, bypass the one active supply to ground. Long breadboard leads can introduce parasitic feedback because the LM224AN is internally compensated but still has finite gain-bandwidth and output-drive limits. Check stability at the intended gain with the actual source resistance, load capacitance, and output wiring.
Do not assume that the 30 V maximum supply rating makes every input and output signal safe at 30 V. The confirmed source material does not specify the input common-mode range, differential input range, or output swing. Before connecting a ±15 V, 24 V, or switched signal, verify those limits in the manufacturer datasheet and include protection where the source can exceed them. Also include the 3 mV input offset in the error budget for high-gain DC-coupled measurements.
For signal-generation and filtering applications, keep feedback components and sensitive inputs away from the output pins and long prototype leads. The 1.2 MHz unity-gain bandwidth is sufficient for many moderate-frequency stages, but closed-loop bandwidth depends on noise gain and the selected feedback network. Measure overshoot and ringing with an oscilloscope using a representative load, and add an isolation resistor close to the output if capacitive loading causes instability.
Although the LM224AN is a PDIP package with generous lead spacing, actual dissipation depends on supply voltage, output voltage, load current, and ambient temperature. Estimated: with a 30 V supply, a 12 V output, and a 1 mA load, the amplifier dissipates approximately (30 V - 12 V) × 0.001 A = 0.018 W. This estimate excludes output-stage loading and confirms why the 30 V rating alone does not imply high dissipation; verify the actual load and worst-case bias current.
Informations de conformité
The verified PartGenie listing shows dashes for RoHS, REACH, and MSL and does not provide affirmative compliance evidence. No AEC-Q100 qualification is stated for LM224AN; the automotive not_applicable value reflects the absence of a stated automotive qualification, not a manufacturer certification.
