LM324AM/NOPB - 4-Channel 1 MHz Op Amp | Texas Instruments
料号： LM324AM/NOPB ✓ 量产中LM324AM/NOPB 概述
An operational amplifier is an analog amplifier used to amplify voltage differences and serve as a building block in analog and mixed-signal systems. The LM324 family belongs to the operational-amplifier, analog-amplifier, and semiconductor hierarchies. Its four channels can perform buffering, voltage amplification, summing, comparison, filtering, and transducer-signal conditioning when configured with passive networks or companion components.
The principal operating characteristics include four amplifier circuits, a 1 MHz gain-bandwidth product, 0.5 V/us slew rate, and a 3 V to 32 V total supply range. The low-power bipolar architecture supports single-supply operation, while internal frequency compensation allows practical closed-loop gain stages without external compensation components. The 14-pin SOIC form factor is also compatible with standard surface-mount assembly and tube-packaging workflows.
Internal frequency compensation trades higher bandwidth for simple implementation and stable operation in general-purpose analog circuits. Each amplifier can use its supply rails as input common-mode limits, so input and output signals must remain within the permitted operating range. Circuit designers should account for input offset voltage, input bias current, output-current capability, common-mode limits, and output swing when choosing gain, feedback values, and external loading.
Typical uses include four-channel sensor conditioning, low-frequency active filters, audio preamplifier stages, general signal buffers, DC summing networks, and mixed-signal interface circuits. The 1 MHz bandwidth is most appropriate for low-frequency and moderate-bandwidth tasks rather than high-speed instrumentation, where a wider-bandwidth amplifier would normally be preferred. The four-channel configuration is especially useful when a board needs several matched general-purpose amplifier functions.
Keep input and output return paths short, decouple each supply rail close to the device, and place feedback components close to the relevant amplifier pins. Avoid driving capacitive loads directly unless the configured gain, load value, and stability behavior have been checked. Input bias-current compensation is important for high-impedance sources because the LM324 uses bipolar input transistors rather than CMOS inputs.
This product record combines the exact LM324AM/NOPB package, operating, and amplifier data with practical application guidance, drop-in comparison options, and design considerations for efficient single-supply analog design.
直接替换替代料： LM324AM/NOPB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM324AM/NOPB （相同外形与封装尺寸） ——差异在于 Amplifier Type, Architecture, Package, Packaging, Slew Rate.
LM324AM
✅ 直接替换联系询价
查看数据手册 →LM324ADR2G
✅ 直接替换联系询价
查看数据手册 →LM324DR
✅ 直接替换联系询价
查看数据手册 →LM324DR2G
✅ 直接替换联系询价
查看数据手册 →LM324AMX/NOPB
✅ 直接替换联系询价
查看数据手册 →LM324AM/NOPB 最大额定值与电气特性
| Number of Amplifier Circuits | 4 circuits |
| Amplifier Type | General Purpose |
| Architecture | Four independent, high-gain, internally frequency-compensated amplifiers |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 0.5 V/us |
| Total Supply Voltage | 3 V to 32 V |
| Power-Supply Configuration | Single supply |
| Device Technology | Bipolar |
| Compensation | Internal frequency compensation |
| Package Type | 14-SOIC, 0.154 inch (3.90 mm) width |
| 安装类型 | Surface Mount |
| Packaging | Tube |
LM324AM/NOPB 14-soic, 0.154 inch (3.90 mm) width 引脚配置指南
LM324AM/NOPB（14-soic, 0.154 inch (3.90 mm) width 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： LM324AM/NOPB.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM324AM/NOPB 适用于 6 应用s: Low-Frequency Active Filters, Sensor Signal Conditioning, Audio Preamplification, DC Voltage Buffering, Analog Summing Networks, Industrial Control Interfaces.
Low-Frequency Active Filters
LM324AM/NOPB is well suited to low-frequency active-filter stages because it combines four internally frequency-compensated amplifiers with a 1 MHz gain-bandwidth product and 0.5 V/us slew rate. Each amplifier can implement a first-order or practical cascaded section using passive resistors and capacitors. Designers should select resistance and capacitance values so the closed-loop operating frequency remains safely below the amplifier bandwidth, while checking output swing and capacitive loading. The 14-SOIC package also allows four filter channels to share one compact footprint, reducing board area compared with four single-amplifier packages.
推荐
Sensor Signal Conditioning
The four independent channels in LM324AM/NOPB can condition several sensor outputs without using four separate amplifier packages. A common arrangement uses one channel for input biasing or buffering, another for gain, and the remaining channels for scaling, offset correction, or active filtering. The 1 MHz gain-bandwidth product is generally more than adequate for many temperature, pressure, and position sensors with slow signal dynamics, but the bipolar input bias current must be considered with high-impedance sources. Input protection, supply decoupling, and common-mode-headroom checks are essential when connecting external sensors.
推荐
Audio Preamplification
LM324AM/NOPB can provide inexpensive, low-frequency gain stages in audio preamplifier and mixer circuits. With four amplifiers on one device, it can support input buffering, gain control, summing, and output-drive functions in a compact design. The 1 MHz gain-bandwidth product and 0.5 V/us slew rate are suitable for general audio and control-signal paths, though they do not target high-fidelity audio or wideband instrumentation. The designer should verify output swing, load impedance, channel stability, and power-supply headroom at the intended signal level.
推荐
DC Voltage Buffering
A unity-gain voltage follower made from LM324AM/NOPB provides a simple way to buffer a high-impedance source from a downstream load. The internal frequency compensation supports this configuration without external compensation components, while four channels allow independent buffering of control, reference, or measurement signals. Because the amplifier uses bipolar input transistors, source impedance affects the resulting input offset caused by bias current. Keep traces short, provide local supply bypassing, and confirm that the connected source and load remain within the input and output common-mode limits.
推荐
Analog Summing Networks
LM324AM/NOPB is useful in DC summing and weighted-mixer circuits where several analog voltages must be combined into one output. Its four amplifiers can implement non-inverting input stages followed by an inverting summing node, with the resistor ratios determining each channel's contribution. The 1 MHz bandwidth is adequate for low-frequency control and measurement signals, but output swing and input bias-current error determine practical accuracy. Use matched resistor networks where channel weighting matters and check the output against both supply rails at the highest expected signal combination.
推荐
Industrial Control Interfaces
LM324AM/NOPB can implement the analog gain and buffering stages surrounding a controller in industrial control equipment. Typical uses include conditioning a transducer reference, scaling a potentiometer, shifting a control voltage, or driving an analog input of a microcontroller. The 14-SOIC package simplifies assembly and provides four channels for compact multi-axis or multi-function interfaces. Engineers should account for the device's 3 V to 32 V supply range, confirm the required temperature grade for the operating environment, and test noise, offset, and settling behavior at the actual signal bandwidth.
推荐
推荐产品汇总
工程参考数据： LM324AM/NOPB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LM324AM | LM324ADR | LM324DR | LM324DR2G | LM324AMX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC | 14-SOIC - same footprint | 14-SOIC - same footprint | 14-SOIC - same footprint | 14-SOIC - same footprint | 14-SOIC - same footprint |
| Amplifier Circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits | 4 circuits |
| Special Ordering Option | LM324AM/NOPB tube ordering designation | Non-/NOPB ordering designation | R suffix ordering designation | R suffix ordering designation | R2G ordering designation | X suffix ordering designation |
关键差异点
- Four amplifiers reduce the number of packages required for multi-channel analog functions （对比 LM324AM)
- Internal frequency compensation simplifies general-purpose amplifier stages （对比 LM324ADR)
- Single-supply operation supports compact power designs （对比 LM324DR)
- Tube packaging matches the documented LM324AM/NOPB shipping format （对比 LM324AMX/NOPB)
设计说明
Place the supply bypass capacitor close to the device power pins and connect it to a low-impedance ground plane. Although the LM324AM/NOPB supports a 3 V to 32 V total supply range, low-voltage operation leaves less output swing than a higher-voltage rail. Check the actual supply voltage, input range, and required output swing before using the full output of a signal chain.
Do not assume every LM324 orderable part is automatically interchangeable with LM324AM/NOPB. Although the alternatives share the 14-SOIC footprint and four-channel topology, temperature grade, ordering suffix, qualification, and delivery format can differ. Compare the manufacturer pin description, supply limits, common-mode range, offset, bias current, output swing, and environmental requirements before approving a substitution.
The bipolar input stage makes input bias current important in high-impedance designs. Add a bias-current compensation resistor equal to the combined source resistance when offset drift matters, and keep input traces short to reduce leakage and interference. The 1 MHz gain-bandwidth product is suitable for low-frequency stages but does not remove the need to control capacitive loading and feedback-node parasitics.
Estimate dissipation from the actual supply voltage, output voltage, and load current before assigning the amplifier to a thermal budget. Estimated: P = (VIN - VOUT) x IL, with power per amplifier also including output-current dissipation and bias requirements. Verify the result against the manufacturer maximum operating conditions and the PCB copper area available for heat spreading.
合规信息
The /NOPB ordering suffix identifies a lead-free option. RoHS, REACH, halogen-free, and conflict-minerals status require confirmation from the manufacturer product record or declaration.
