LM324ADE4 - Quad 1.2MHz Op Amp | Texas Instruments | SOIC-14
MPN： LM324ADE4 ✓ 啟用中LM324ADE4 概覽
An operational amplifier is an analog signal-conditioning IC that compares two input voltages and amplifies their difference through high open-loop gain. The LM324ADE4 belongs to the operational-amplifier hierarchy within amplifier ICs and analog semiconductors. Its four independent channels allow one package to provide feedback control, buffering, level shifting, summation, and general analog amplification without requiring four separate amplifier packages.
The four amplifiers feature internally frequency compensation, allowing operation as stable unity-gain buffers without external compensation components. A 1.2 MHz gain-bandwidth product and 0.5 V/µs slew rate support audio-band and general-purpose closed-loop applications. The device also supports operation from a single positive supply as well as split bipolar supplies, making it useful in mixed industrial, instrumentation, control, and consumer circuits.
The 14-SOIC package is pin-compatible with the established LM324 family arrangement, which simplifies repair, prototyping, and board reuse. Each amplifier has differential inputs, an output, and power connections, with the package distributing those functions across four channels. Because the amplifiers are independent rather than sharing internal output stages, each channel can be used for a separate signal path or left unused when its input and output are properly configured.
Typical uses include sensor-signal conditioning, low-current motor and actuator drivers, audio preamplification, analog summing networks, threshold detection, and general instrumentation. The 1.2 MHz bandwidth is adequate for many audio and control signals, but designs requiring substantially higher bandwidth, lower offset voltage, faster settling, or lower noise should use a more specialized amplifier family.
Design carefully around input common-mode range, output swing, input bias current, and the limits of each amplifier channel. Keep sensitive inputs away from noisy return paths, observe the recommended bypass capacitors at the supply pins, and avoid operating near the output saturation limits. The manufacturer datasheet should guide input/output protection, supply decoupling, unused-channel configuration, and maximum input and output voltage conditions.
This product page combines the LM324ADE4 operating parameters, package details, practical application guidance, pin-focused design considerations, and qualified drop-in alternatives. It is intended to help engineers identify where this economical quad general-purpose amplifier fits and where a higher-performance or application-specific amplifier is more appropriate.
直接替換替代品，適用於 LM324ADE4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LM324ADE4 （相同外形與佔位） — 差異在於 Package, Number of Amplifiers.
LM324AD
✅ 直接替換聯絡詢價
查看資料表 →LM324M
✅ 直接替換聯絡詢價
查看資料表 →LM324KADG4
✅ 直接替換📋 參考替代品（不在目錄中）
LM324ADE4 最大額定值與電氣特性
| Amplifier Type | Quad general-purpose operational amplifier |
| Number of Amplifiers | 4 independent channels |
| Gain-Bandwidth Product | 1.2 MHz |
| Slew Rate | 0.5 V/µs |
| Supply Voltage Range | Single supply or split supply up to ±16 V |
| Minimum Total Supply Voltage | 3 V |
| Maximum Total Supply Voltage | 32 V |
| Frequency Compensation | Internally compensated |
| 封裝 | 14-SOIC (14 pins) |
| Package Width | 3.90 mm |
| 安裝類型 | Surface mount |
| 輸出數量 | 4 outputs |
LM324ADE4 3.90 mm 腳位配置指南
LM324ADE4（3.90 mm 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LM324ADE4.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM324ADE4 適用於 6 應用s: Sensor Signal Conditioning, Audio Preamplification, Industrial Control Loops, Buffering and Level Shifting, Threshold Detection and Relay Logic, Test and Measurement Front Ends.
Sensor Signal Conditioning
The LM324ADE4 is suitable for conditioning outputs from slow analog sensors because each of its four internally compensated channels can amplify a small differential signal referenced close to ground. The 1.2 MHz gain-bandwidth product supports closed-loop gains that do not require more bandwidth than the sensor path can deliver. Use one channel for amplification and another for an offset or threshold stage, while observing the input common-mode limits. On a 5 V single supply, biasing may be necessary when the sensor output can remain near ground. Decouple the supply pins locally and keep sensor returns away from high-current output paths to prevent common-mode errors and unstable feedback behavior.
推薦
Audio Preamplification
The LM324ADE4 can provide modest audio-band voltage gain when the source impedance and required bandwidth are compatible with its 1.2 MHz gain-bandwidth product and 0.5 V/µs slew rate. Four independent channels allow separate preamplifier, balance, or mix stages in one 14-SOIC package. Its general-purpose architecture favors straightforward line-level amplification rather than low-noise microphone work. Check the input-voltage and bias-current limits against the source, and use the manufacturer application information to choose suitable feedback and compensation arrangements. Keep audio return currents separate from digital and switching-node paths to minimize hum and channel crosstalk.
推薦
Industrial Control Loops
The four independent LM324ADE4 channels are useful in basic industrial control loops where error amplification, actuator drive, and signal comparison must fit in a compact package. The 1.2 MHz bandwidth is more than adequate for many slow feedback loops, while the 0.5 V/µs slew rate can drive moderate capacitive loads when stability is checked. Use separate channels for error, feedforward, and output-stage functions, with RC compensation added only where the closed-loop response requires it. Protect inputs against industrial transients and observe the output-current limit. A grounded guard around sensitive high-impedance nodes helps reduce leakage-induced offsets and noise pickup.
推薦
Buffering and Level Shifting
LM324ADE4 channels configured as unity-gain buffers are practical for impedance isolation between higher-impedance sensors and downstream measurement circuits. Internal frequency compensation removes the need for a separate compensation capacitor in the standard non-inverting buffer configuration. The device can operate from split supplies when the system provides bipolar signals, or from a single positive rail when downstream logic requires a referenced output. Verify that the input remains inside the common-mode range and that the output has sufficient swing. Place bypass capacitors at the package supply pins and route feedback traces away from power-converter nodes to preserve low-noise operation.
推薦
Threshold Detection and Relay Logic
The LM324ADE4 can compare a sensor or supply-derived voltage against a reference and produce a control signal for threshold-based system behavior. Its 1.2 MHz closed-loop bandwidth provides ample response time for slow monitoring functions, and four channels allow multiple comparisons without separate packages. Set the reference with a stable resistor divider or reference source and add hysteresis to prevent oscillation when noise crosses the threshold. Use an output driver stage when the load current exceeds the amplifier's capability. Confirm output-swing margins under the worst-case supply and load conditions before connecting the signal to a relay driver, counter, or MCU input.
推薦
Test and Measurement Front Ends
LM324ADE4 channels can form the input-conditioning front end of a general-purpose measurement instrument by buffering sources, amplifying differential voltages, and driving an ADC. The 1.2 MHz gain-bandwidth product accommodates slow instrumentation signals, while the 0.5 V/µs slew rate supports moderate settling requirements at reduced gain. Use grounded differential routing, short feedback paths, and careful source-impedance balancing to minimize offset and conversion error. Input protection must preserve the allowed common-mode range, and the chosen ADC should be sampled only after the amplifier output has settled. This arrangement favors general bench and panel equipment rather than precision or wide-band measurement front ends.
推薦
推薦產品摘要
工程參考資料，適用於 LM324ADE4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LM324AD | LM324M | LM324KADG4 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Number of Amplifiers | 4 independent channels | 4 independent channels | 4 independent channels | 4 independent channels |
| Gain-Bandwidth Product | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz |
| Slew Rate | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs | 0.5 V/µs |
| Qualification and Temperature Grade | E4 qualification and temperature-grade suffix | AD qualification and temperature-grade suffix | M qualification and temperature-grade suffix | KADG4 qualification and temperature-grade suffix |
主要差異化特點
- Four independent general-purpose channels in one package (對比LM324M)
- Matches the core LM324M bandwidth and slew rate (對比LM324M)
- Pin-compatible option for qualified family sourcing (對比LM324AD)
設計說明
Place the supply-bypass capacitor and feedback components close to the relevant LM324ADE4 pins. Keep the input and feedback traces short, and route them away from switching-node copper and high-current return paths. For a high-impedance source, use a guarded or driven shield where practical because leakage and surface contamination can create errors larger than the intended signal. Confirm the 14-pin SOIC land pattern against the package drawing before release.
Do not treat the full supply-voltage range as the input common-mode or output-swing range. A 5 V single-supply circuit can still clip an output or violate the input range if the signal approaches a rail. Add biasing for ground-referenced, single-supply signals and include adequate output headroom. Also account for the LM324ADE4 input-bias current when designing with high-source-impedance sensors.
Internal frequency compensation supports standard unity-gain operation, but capacitive loading can still reduce stability or cause oscillation. Keep the output connection short, isolate long cable or probe capacitance, and add an isolation resistor when the load requires it. Verify closed-loop gain, phase margin, and output settling at the lowest intended supply voltage rather than relying only on nominal simulation conditions.
For split-supply circuits, connect the bypass network to the same quiet ground reference used by the signal source. Avoid creating large copper loops between input and output grounds, because those loops can couple motor, relay, or digital currents into the amplifier. Use a solid ground-plane strategy for the 14-SOIC footprint and keep the exposed routing area beneath the package free of unnecessary high-current paths.
合規資訊
No specific RoHS, REACH, halogen-free, or conflict-minerals declaration is identified in the manufacturer page listing. The E4 orderable suffix does not by itself establish automotive qualification.
