LM324AD - Quad 30V 1.2MHz Op Amp | Texas Instruments
Артикул: LM324AD ✓ АктивенLM324AD Обзор
An operational amplifier is an analog signal-processing IC that uses high-gain differential amplification to increase the voltage presented at its input. The LM324 belongs to the general-purpose amplifier segment of the larger voltage-feedback operational-amplifier hierarchy. Internally compensated amplifiers simplify closed-loop design because no external frequency-compensation components are required for ordinary gain configurations. Four independent amplifiers in one package reduce board area and component count in multi-channel sensor, filtering, buffering, and control circuits.
The verified product information identifies four amplifier circuits, a 1.2 MHz gain-bandwidth product, a 3 mV offset-voltage rating, and operation from a supply as high as 30 V. The internal compensation supports stable operation in standard noninverting and inverting amplifier arrangements. Because the LM324AD is a general-purpose device, design engineers should treat it as a cost-conscious solution rather than a precision op amp with rail-to-rail outputs, low offset over temperature, or very low noise.
Common uses include buffering sensor outputs, amplifying low-level control signals, active filtering, differential signal conditioning, and driving ADC input stages. The four independent channels can process separate analog signals or implement stages such as a two-stage filter or transimpedance-style front end. Single-supply operation is particularly useful in industrial controls, embedded instrumentation, educational electronics, and simple battery-powered systems where a negative rail is unavailable.
When using the LM324AD, verify input and output common-mode limits, output-current capability, load impedance, and stability under the selected closed-loop gain before finalizing the design. Place input and output compensation or decoupling components close to the relevant pins, keep sensitive input routing away from switching nodes, and include adequate bypassing on the power supply. The 14-pin SOIC package also requires attention to thermal pad-free layout and copper continuity when operating at high ambient temperatures.
This product page combines verified manufacturer and distributor information, lifecycle-oriented sourcing details, same-footprint alternatives, and practical design guidance. It adds a same-package comparison framework and implementation notes that are more useful for PCB and sourcing decisions than a distributor listing alone.
Аналоги без доработки для LM324AD — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LM324AD (тот же форм-фактор и посадочное место) — отличается по Input Offset Voltage, Package.
LM324D
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Открыть даташит →LM324AD Максимальные параметры и электрические характеристики
| Number of Amplifier Circuits | 4 circuits |
| Maximum Supply Voltage | 30 V |
| Gain-Bandwidth Product | 1.2 MHz |
| Input Offset Voltage | 3 mV |
| Supply Configuration | Single supply or split supply |
| Internal Frequency Compensation | Internally compensated |
| Differential Input Type | True differential inputs |
| Количество выводов | 14 pins |
| Корпус | 14-pin SOIC (D) |
| Тип монтажа | Surface mount |
| Диапазон рабочих температур | 0 C to +70 C |
Конфигурация выводов LM324AD
| Контакт 1 | OUT1 — Amplifier 1 output |
| Контакт 2 | IN1- — Amplifier 1 inverting input |
| Контакт 3 | IN1+ — Amplifier 1 noninverting input |
| Контакт 4 | V+ — Positive supply voltage |
| Контакт 5 | IN2+ — Amplifier 2 noninverting input |
| Контакт 6 | IN2- — Amplifier 2 inverting input |
| Контакт 7 | OUT2 — Amplifier 2 output |
| Контакт 8 | OUT3 — Amplifier 3 output |
| Контакт 9 | IN3- — Amplifier 3 inverting input |
| Контакт 10 | IN3+ — Amplifier 3 noninverting input |
| Контакт 11 | V- — Negative supply voltage or ground in single-supply operation |
| Контакт 12 | IN4+ — Amplifier 4 noninverting input |
| Контакт 13 | IN4- — Amplifier 4 inverting input |
| Контакт 14 | OUT4 — Amplifier 4 output |
Типичное применение
LM324AD подходит для 6 применениеs: Industrial Sensor Signal Conditioning, Data Acquisition and ADC Input Buffering, Active Audio and Control Filters, Battery-Powered Embedded Instrumentation, Power Supply Feedback and Monitoring, Educational and Prototype Signal Conditioning.
Industrial Sensor Signal Conditioning
The Texas Instruments LM324AD suits industrial sensor-conditioning stages that require several general-purpose analog channels in one 14-pin SOIC package. Its four independently compensated amplifiers can buffer a sensor, apply gain, and perform active filtering without requiring four separate packages. The verified 30 V supply rating supports compatibility with many 24 V industrial signal chains, although the exact input common-mode range is not stated in the supplied data. A 3 mV input offset voltage is acceptable for coarse measurements but may require calibration for high-resolution sensing. Verify the producer-specific common-mode limits, output swing, supply current, and sensor excitation range before committing the circuit.
Рекомендуется
Data Acquisition and ADC Input Buffering
The LM324AD can provide four independent input-buffer channels ahead of an analog-to-digital converter in a data-acquisition design. Internal frequency compensation makes standard noninverting and inverting configurations straightforward, while the 1.2 MHz gain-bandwidth product is adequate for many low-frequency measurement paths. The device operates from a single supply or split supplies, which helps when the converter reference and sensor bias are not centered at ground. Designers should confirm that the 3 mV offset specification is acceptable for the converter resolution and ensure the output remains within the allowed swing throughout the input range.
Рекомендуется
Active Audio and Control Filters
The LM324AD is appropriate for low-frequency active-filter and control-signal networks where four general-purpose amplifier channels are useful. Examples include smoothing a control-voltage node, shaping a low-pass or notch response, and buffering source and sink stages. The internally compensated topology avoids external compensation in standard closed-loop configurations, while the 1.2 MHz gain-bandwidth product provides useful bandwidth for audio-bandwidth signals. Because this is a general-purpose amplifier rather than a rail-to-rail precision device, the designer must check output headroom, input range, slew behavior, and stability when driving the selected filter load.
Рекомендуется
Battery-Powered Embedded Instrumentation
The LM324AD can support battery-powered embedded instrumentation because the LM324 family is designed for single-supply operation across a wide voltage range. Four internal amplifiers allow a compact instrument to combine sensor buffering, gain adjustment, and filtering while retaining a common 14-pin footprint. The verified device information does not specify quiescent current, so battery-life calculations must use the exact manufacturer datasheet rather than an assumed value. Care is also required near the lower supply limit because the usable input and output ranges can be narrower than the 30 V maximum supply rating.
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Power Supply Feedback and Monitoring
The LM324AD can implement voltage comparison, filtered feedback, and auxiliary monitoring functions around a regulated power supply. Its 30 V maximum supply rating is useful when monitoring a 24 V rail, and the four independent channels permit comparisons, scaling, and filtering within a single package. The 3 mV offset specification determines the resolution of low-level threshold measurements, so it may be too coarse for precision supervision but can be useful for coarse fault detection. Verify the common-mode range at the monitored voltage and ensure that the amplifier supply arrangement permits the required input voltage.
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Educational and Prototype Signal Conditioning
The LM324AD is well suited to educational prototypes, breadboard-equivalent modules, and general-purpose laboratory signal-conditioning experiments because it combines four amplifiers, single-supply capability, and internal frequency compensation in one accessible package. Students can use separate channels for noninverting gain, inverting gain, buffering, and active filtering while sharing one supply. The verified 14-pin SOIC format also makes it straightforward to compare different manufacturer versions. Before placing it on a final board, engineers should consult the exact datasheet for voltage limits, output capability, thermal conditions, and package pin drawings.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LM324AD — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM324D | LM324AD | LM324AD | LM324AD | LM324AD |
|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | STMicroelectronics | NXP Semiconductors | onsemi | Motorola |
| Package | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SO | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Number of Amplifier Circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Supply Configuration | Single supply or split supply | Single supply or split supply | Single supply or split supply | Single supply or split supply | Single supply or split supply | Single supply or split supply |
| Internal Frequency Compensation | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated |
| Special Feature | Single-supply operation | LM324 family single-supply operation | Single-supply quad amplifier | Single-supply quad amplifier | Single-supply quad amplifier | Single-supply quad amplifier |
Ключевые отличия
- Four general-purpose amplifier channels in one package (против LM324D)
- Direct same-package manufacturer sourcing options (против STMicroelectronics LM324AD)
- Single-supply quad-amplifier architecture (против NXP Semiconductors LM324AD)
Заметки по проектированию
The LM324AD supports a maximum supply of 30 V, but the allowable input and output swing can be narrower than that limit. In single-supply operation, bias the signal around mid-supply when the output must retain symmetrical headroom. Verify the exact producer-specific common-mode and output-swing limits before fixing resistor values. Add local supply decoupling near pins 4 and 11 and avoid long supply traces that can couple switching or digital noise into four amplified channels.
Keep the four input paths short and route them away from the supply pins, clock lines, and switching-node copper. Each channel is independent electrically, but shared package and supply impedances can couple disturbances between channels. Place input-bias or feedback components close to their associated pins, maintain a continuous ground reference under the device where practical, and follow the exact manufacturer land pattern because the verified data identifies a 14-pin SOIC package but does not provide a land-pattern drawing.
Do not treat the 3 mV input offset rating as a precision guarantee across temperature, and do not assume that the 1.2 MHz gain-bandwidth product permits accurate operation near that bandwidth. The latter is a small-signal bandwidth parameter, while large-signal behavior also depends on slew rate and output-current capability. Check gain error, source impedance, load impedance, output swing, and channel stability in the exact Texas Instruments LM324A datasheet before using the device in precision measurement paths.
Информация о соответствии
The supplied source snippets did not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification statements. AEC-Q100 is not applicable to the general-purpose LM324AD product as presented.