LM2902DG - 4-Channel 1 MHz Op Amp | onsemi | SOIC-14
料号： LM2902DG ✓ 量产中LM2902DG 概述
An operational amplifier, commonly shortened to op amp, is an analog integrated circuit that amplifies the difference between two input voltages. A quad operational amplifier integrates four amplifiers into one package. Within the device hierarchy, LM2902DG belongs to the operational-amplifier, analog-amplifier, and integrated-circuit categories. Its differential input structure makes it useful for amplifying sensor signals, buffering analog voltages, and implementing general-purpose analog signal-conditioning circuits.
Key operating characteristics include a 1 MHz gain-bandwidth product and 0.6 V/µs slew rate. The 3 V minimum supply voltage supports low-voltage analog systems, while operation up to 32 V covers higher-voltage industrial signal chains. Four independent channels reduce package count and simplify board design when multiple analog signals must be amplified, buffered, or filtered.
The LM2902 family uses the LM324-series architecture optimized for single-supply operation. True differential inputs allow each amplifier to respond to the voltage difference between its inverting and non-inverting terminals. Because the four channels share one package, designers must consider common supply and ground connections, output-current behavior, stability with capacitive loads, and power dissipation when all channels operate simultaneously.
Typical uses include industrial sensor interfaces, low-side current measurement, analog signal conditioning, transducer amplification, general-purpose buffer stages, and four-channel control systems. A single package can implement four similar signal paths, provided each channel remains within its input-voltage, output-swing, current, and stability limits.
A key design consideration is the relationship between supply voltage, output swing, and input common-mode range. Confirm that incoming sensor signals remain within the amplifier's permitted input range and that the required output voltage can be reached with the selected load. Place bypass capacitors close to the supply pins and route the common ground connection carefully to minimize offset and noise coupling.
This product page combines the exact LM2902DG electrical and package identifiers with engineering-focused selection guidance, drop-in cross-reference information, comparison parameters, and practical PCB design notes. It is intended to help engineers determine package compatibility, verify key operating limits, and select a replacement without overlooking changes in amplifier performance or environmental requirements.
直接替换替代料： LM2902DG ——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： LM2902DG （相同外形与封装尺寸） ——差异在于 Input Type.
LM2902DR2G
✅ 直接替换联系询价
查看数据手册 →NCV2902DR2G
✅ 直接替换📋 参考替代料（不在目录中）
LM2902B
✅ 直接替换📋 参考替代料（不在目录中）
LP2902M/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM2902NSR
✅ 直接替换📋 参考替代料（不在目录中）
LM2902DG 最大额定值与电气特性
| Product Type | Quad operational amplifier |
| Number of Amplifier Channels | 4 channels |
| Amplifier Category | General purpose |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 0.6 V/µs |
| Minimum Supply Voltage | 3 V |
| Maximum Supply Voltage | 32 V |
| Input Type | True differential inputs |
| Supply Style | Single supply |
| Package Type | SOIC-14 |
| Total Pin Count | 14 pins |
| 安装类型 | Surface mount |
LM2902DG soic-14 引脚配置指南
LM2902DG（soic-14 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： LM2902DG.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LM2902DG 适用于 6 应用s: Industrial Sensor Signal Conditioning, Low-Side Current Measurement, Analog Buffering and Level Conditioning, Transducer and Bridge Amplification, Multi-Channel Control Systems, Audio and Communication Interface Circuits.
Industrial Sensor Signal Conditioning
The LM2902DG fits four-channel sensor conditioning because each amplifier provides true differential inputs, a 1 MHz gain-bandwidth product, and a 0.6 V/µs slew rate in one 14-pin SOIC package. Use one channel to amplify a differential sensor output and the remaining channels for reference, filtering, or monitoring functions. The 3 V minimum supply supports low-voltage instrumentation, while the 32 V maximum permits operation from higher-voltage industrial rails. Confirm that sensor outputs remain inside the amplifier’s input common-mode range and that the required output swing can be achieved at the selected load. Decouple the supply pins and keep input routing away from switching circuitry to preserve signal integrity.
Low-Side Current Measurement
The LM2902DG can implement a low-side current-sense amplifier using one channel to amplify the voltage generated across a small sense resistor. Its 1 MHz gain-bandwidth product supports moderate-bandwidth feedback networks, while the 0.6 V/µs slew rate provides useful transient response for current-step signals. The other three channels can support output filtering, midpoint or reference buffering, and fault-channel monitoring. Because the measured shunt voltage is normally small, input offset and bias behavior are important to the accuracy budget. Use the onsemi electrical-characteristics table to select resistor values and confirm that the common-mode voltage remains within the valid input range.
Analog Buffering and Level Conditioning
The LM2902DG provides four independent general-purpose amplifiers for buffering references, level-shifting analog nodes, and driving downstream measurement circuits. The true differential inputs make each channel suitable for comparing a sensed voltage with a reference rather than merely following a single-ended signal. Its 1 MHz gain-bandwidth product and 0.6 V/µs slew rate are appropriate for many low- to moderate-frequency instrumentation paths. When operating near the output-swing or input-range limits, verify the exact operating point against the electrical-characteristics table. Keep the feedback network compact and place the device near the analog source to minimize pickup on high-impedance input nodes.
Transducer and Bridge Amplification
For strain-gauge, pressure, and other bridge-based transducers, the LM2902DG can amplify small differential signals while its four channels provide space for additional conditioning functions. True differential inputs are valuable when the transducer output is referenced close to the lower supply rail. The 1 MHz gain-bandwidth product allows practical use with moderate-gain feedback networks, and the 3 V to 32 V supply range supports different transducer excitation systems. The final gain, common-mode range, output offset, and input bias current must be balanced against bridge impedance and required accuracy. Follow the datasheet’s recommended circuit arrangements and keep high-gain feedback traces short.
Multi-Channel Control Systems
The LM2902DG is useful when a controller must condition several comparable analog inputs, such as feedback, command, and monitoring channels. Integrating four amplifiers into a 14-pin SOIC reduces the number of discrete packages and keeps related analog circuitry physically compact. With a 1 MHz gain-bandwidth product and 0.6 V/µs slew rate, the device can handle many control and monitoring signals whose bandwidth is not high enough to require a modern high-speed precision amplifier. Validate channel-to-channel offset, output drive, stability, and thermal performance at the maximum expected load. A shared package also makes supply bypassing and ground-return layout especially important.
Audio and Communication Interface Circuits
The LM2902DG can implement low-frequency audio preamplifier, mixer, or interface stages where low cost and a single-supply range are more important than wide bandwidth or low distortion. Its four channels allow several gain stages to share one package, and the 1 MHz gain-bandwidth product covers many voice-band signal paths. The 3 V to 32 V supply range supports portable, industrial, and higher-voltage legacy interface designs. Audio performance still depends on output swing, load impedance, input offset, and feedback-network values, so those characteristics must be checked in the onsemi datasheet. Keep the layout compact and provide local supply bypassing for lower noise.
工程参考数据： LM2902DG ——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 | LM2902DR2G | NCV2902DR2G | LM2902B | LP2902M/NOPB | LM2902NSR |
|---|---|---|---|---|---|---|
| Package | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 |
| Brand | onsemi | onsemi | onsemi | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Amplifier Channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount | Surface mount |
关键差异点
- Lower maximum operating voltage than the next-generation LM2902B （对比 LM2902B)
- Original onsemi LM2902-family sourcing alignment （对比 LM2902NSR)
- Four integrated general-purpose channels （对比 LM2902DR2G)
设计说明
Place the LM2902DG near the analog circuits it serves and connect all ground pins to a common low-impedance ground plane. Keep the 14-pin SOIC footprint free of unintended thermal or signal pads, and route each differential input as a close-coupled pair where practical. High-impedance inputs should be short and surrounded by grounded copper where appropriate to reduce capacitive pickup.
Add local supply bypassing close to the LM2902DG supply pins, using the capacitor values and layout shown in the manufacturer’s application guidance. Because all four amplifiers share one package, supply noise and ground disturbance can affect every channel simultaneously. Calculate worst-case package dissipation when all channels operate continuously at maximum output current and use copper area or thermal relief appropriate to the PCB thickness.
Do not assume that a 3 V to 32 V supply rating guarantees usable input and output ranges across that entire span. Check input common-mode limits, output swing, output current, and load stability for the chosen supply voltage. Also verify the precise ordering code when substituting another LM2902-family device, since temperature grade, qualification, and package suffix can affect suitability even when the PCB outline remains unchanged.
合规信息
No specific LM2902DG compliance declaration appears in the product result summaries. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive-qualification status from the manufacturer’s current declaration or ordering documentation.
