LM324AN - Quad 30V 1.2MHz Op Amp | Texas Instruments
MPN: LM324AN ✓ AktifLM324AN Genel Bakış
An operational amplifier is an analog integrated circuit that amplifies the difference between its non-inverting and inverting inputs. The LM324AN belongs to the general-purpose operational amplifier family within the broader voltage-amplifier and analog signal-conditioning hierarchy. Internally compensated gain stages allow the amplifier to provide stable closed-loop operation without an external compensation capacitor, while the differential input architecture supports common-mode operation from ground upward in many single-supply circuits.
Each of the four amplifier sections has a differential input, an output, and internal bias compensation. The 3 mV input offset rating is suitable for general instrumentation, sensor interfaces, active filtering, and audio preamplification where the signal is not operating near the precision limits of a dedicated low-offset amplifier. The 1.2 MHz gain-bandwidth product provides adequate bandwidth for low-frequency control, buffering, and modest-frequency signal-processing applications.
The LM324AN is a classic single-supply-oriented device, but its wide supply capability also permits conventional dual-supply operation where the common-mode input range permits it. The four independent amplifiers can implement separate gain stages, comparators, filters, or buffer functions in one package. The through-hole PDIP construction is particularly useful for prototype boards, educational systems, industrial controllers, and repair assemblies where socketed or manually inserted parts are preferred over fine-pitch surface-mount packages.
Typical uses include DC signal conditioning, bridge-amplifier interfaces, loop filtering, audio mixing stages, general feedback control, and low-cost sensor amplification. Because the LM324AN is not a rail-to-rail input or output amplifier, the engineer should verify input common-mode range and output swing against the selected supply voltage. Decoupling capacitors are normally placed close to the supply pins to control impedance and prevent feedback from disturbing analog signal integrity.
For new precision designs, compare the LM324AN with rail-to-rail or low-offset alternatives before committing to the design. For established DIP-14 layouts and repair work, the LM324AN remains useful because several LM324-family devices from different manufacturers are offered in the same 14-pin through-hole footprint. Pricing shown for this page is referenced as of October 29, 2026 and should be rechecked against current distributor inventory.
This page consolidates manufacturer specifications, verified distributor listings, cross-reference options, pin-level implementation guidance, and application-specific design notes that help engineers evaluate the LM324AN beyond a basic distributor catalogue entry.
Drop-in alternatifler için LM324AN — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller LM324AN (aynı form faktörü ve ayağa oturma) — farklı olan Amplifier Type, Gain-Bandwidth Product, Maximum Supply Voltage, Mounting Type, Package.
LM324N
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM324-N
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
LM324AN
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM324N
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM324N
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM2902N
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →LM324AN Maksimum Değerlendirmeler & Elektriksel Özellikler
| Amplifier Type | General-purpose operational amplifier |
| Number of Amplifiers | 4 circuits |
| Number of Independent Outputs | 4 outputs |
| Maximum Supply Voltage | 30 V |
| Gain-Bandwidth Product | 1.2 MHz |
| Input Offset Voltage | 3 mV |
| Compensation | Internally frequency-compensated |
| Supply Configuration | Single or dual supply |
| İşletim Sıcaklığı Aralığı | 0°C to +70°C |
| Paket | 14-pin PDIP |
| Montaj Türü | Through-hole |
| Pin Sayısı | 14 pins |
LM324AN Pin Yapısı
| Pin 1 | OUT1 — Amplifier 1 output |
| Pin 2 | IN1- — Amplifier 1 inverting input |
| Pin 3 | IN1+ — Amplifier 1 non-inverting input |
| Pin 4 | V- — Negative supply or ground connection |
| Pin 5 | IN2+ — Amplifier 2 non-inverting input |
| Pin 6 | IN2- — Amplifier 2 inverting input |
| Pin 7 | OUT2 — Amplifier 2 output |
| Pin 8 | OUT3 — Amplifier 3 output |
| Pin 9 | IN3- — Amplifier 3 inverting input |
| Pin 10 | IN3+ — Amplifier 3 non-inverting input |
| Pin 11 | V+ — Positive supply connection |
| Pin 12 | IN4+ — Amplifier 4 non-inverting input |
| Pin 13 | IN4- — Amplifier 4 inverting input |
| Pin 14 | OUT4 — Amplifier 4 output |
Tipik Uygulamalar
LM324AN için uygundur 6 uygulamas: Single-Supply Sensor Signal Conditioning, Audio Preamplifier and Mixing Stage, Active Filters and Control Loops, Industrial Sensor-to-Controller Interface, Legacy Instrumentation and Test Equipment, Battery-Powered Low-Power Monitoring.
Single-Supply Sensor Signal Conditioning
The LM324AN suits single-supply sensor conditioning because it contains four internally compensated amplifiers and is designed for operation from one supply. One section can buffer a resistive sensor, another can apply selectable gain, and a third can shift the signal into the input range of an ADC. The 3 mV offset rating is useful when the sensor output is millivolt-scale and the amplifier is not required to reach precision-amplifier limits. Because the LM324AN is not rail-to-rail, the sensor output and bias point must remain inside its input common-mode range.
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Audio Preamplifier and Mixing Stage
The LM324AN can provide inexpensive voltage gain for microphone-level, line-level, or control-audio signals when distortion and noise are not the primary constraints. Its four amplifiers allow two stereo channels to use matched gain stages while two additional sections form input mixers or active filters. The 1.2 MHz gain-bandwidth product provides useful headroom for audio-band amplification at modest closed-loop gains. Supply decoupling near pins 11 and 4 reduces channel-to-channel noise coupling, while stable feedback ratios should be retained to avoid oscillation.
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Active Filters and Control Loops
The LM324AN is widely used in first-order and moderate-order active filters because its internal frequency compensation removes the need for an external compensation capacitor. Four independent amplifiers can implement cascaded low-pass sections, a three-stage filter, or a proportional-integral control loop with less shared circuitry. The 1.2 MHz gain-bandwidth product supports closed-loop operation at audio and low-frequency control bandwidths. Component tolerances should be checked against the filter's gain and cutoff-frequency requirements, and unused amplifier sections should be tied to a defined common-mode voltage.
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Industrial Sensor-to-Controller Interface
The LM324AN is appropriate for general industrial interface boards that convert slowly varying sensor signals into analog control voltages. The four-amplifier arrangement can provide sensor buffering, differential amplification, gain conditioning, and an active output filter within one package. Its 30 V maximum supply-voltage rating is useful for industrial systems with higher nominal rails, but the complete common-mode and output-swing ranges must be checked at the selected supply voltage. Reverse-polarity, surge, and ESD protection should be placed outside the amplifier rather than assumed to be handled by the IC.
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Legacy Instrumentation and Test Equipment
The LM324AN is especially useful for maintaining older laboratory instruments, educational trainers, and test fixtures built around the standard 14-pin DIP quad-op-amp footprint. A failed amplifier can be replaced without redesigning the printed circuit board as long as the substitute's pinout, supply rating, common-mode range, and compensation method match. The 0°C to 70°C specification suits commercial laboratory environments. For safety-critical measurements, the instrument's leakage, grounding, and precision requirements should be reviewed because the LM324AN is a general-purpose rather than precision device.
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Battery-Powered Low-Power Monitoring
The LM324AN can support low-duty-cycle battery monitoring when the application does not require a rail-to-rail input or exceptionally low quiescent current. It can monitor a divided battery voltage, amplify a thermistor or sensor bridge, and compare the conditioned result against a reference. Because the verified source does not state the LM324AN supply-current rating, the system designer should obtain that value from the datasheet and compare it with the available battery current. A low-power comparator or dedicated amplifier may provide a better result when continuous operating current dominates the design.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: LM324AN — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | LM324N | LM324-N | LM324AN | LM324N | LM324N | LM2902N |
|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments | NXP Semiconductors | onsemi | STMicroelectronics | NXP Semiconductors |
| Package | PDIP-14 | PDIP-14 | PDIP-14 | PDIP-14 | PDIP-14 | PDIP-14 | PDIP-14 |
| Amplifier Count | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Internal Frequency Compensation | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Mounting Style | Through-hole PDIP | Through-hole PDIP | Through-hole PDIP | Through-hole PDIP | Through-hole PDIP | Through-hole PDIP | Through-hole PDIP |
Ana Farklılayıcılar
- Verified A-grade performance with a 3 mV offset rating (karşılaştırma:LM324N)
- Explicit 30 V and 1.2 MHz ratings (karşılaştırma:LM324-N)
- Same 14-pin DIP footprint with four independent amplifiers (karşılaştırma:LM2902N)
Tasarım Notları
The LM324AN supports single- or dual-supply operation, but the 30 V figure is a maximum rating rather than a recommended operating voltage. Confirm the minimum supply, input common-mode range, output swing, and output-current limits from the manufacturer datasheet before fixing the rail voltage. In single-supply systems, bias non-inverting inputs above the negative-rail region allowed by the device so that output swing remains usable.
Connect pin 4 directly to the system ground or negative supply and place the supply bypass capacitor between pins 11 and 4 as close to the package as practical. A 0.1 µF ceramic capacitor provides high-frequency bypassing, while additional bulk capacitance may be needed for longer supply traces. Keep amplifier input and feedback routes away from high-current switching nodes to reduce coupled noise and maintain stable closed-loop behavior.
Do not treat the LM324AN as a rail-to-rail input or output amplifier. Verify that sensor and feedback voltages remain within the common-mode range and that the required output level retains output-swing margin. When substituting another manufacturer's LM324, confirm offset voltage, bias current, noise, bandwidth, slew rate, and stability behavior; package compatibility alone does not guarantee electrical equivalence.
Use short feedback paths and keep the non-inverting input away from sources of high-impedance leakage. The 3 mV offset specification may be significant with millivolt-scale sensors, so gain-stage layout and resistor matching can be as important as the amplifier selection. If an unused amplifier section is present, avoid leaving its inputs floating; connect it as a voltage follower with an input inside the permitted common-mode range.
Uyumluluk Bilgisi
The supplied verified records identify the device and its electrical headline specifications but do not contain explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance status has been assumed.