LM2904DG4 - Dual 26V 700kHz Op Amp | Texas Instruments
料号： LM2904DG4 ✓ 量产中LM2904DG4 概述
An operational amplifier is an analog signal-processing IC that amplifies the voltage difference between its non-inverting and inverting inputs. The LM2904 belongs to the operational-amplifier hierarchy, combining high open-loop voltage gain with negative feedback to set closed-loop behavior. Its two independent channels make it useful wherever two separate analog signals must be conditioned within the same package.
Key characteristics include a 700 kHz gain-bandwidth product, a 0.3 V/µs slew rate, and a 0.7 mA typical supply-current drain. The common-mode input range includes ground, allowing single-supply systems to accept input signals near the lower supply rail. These characteristics support cost-sensitive general-purpose designs rather than precision or high-speed instrumentation.
Internally, the LM2904 uses a conventional bipolar operational-amplifier architecture, with two independent amplifier channels and an eight-pin SOIC package. The 700 kHz gain-bandwidth product permits useful closed-loop bandwidth at moderate gain, while the 0.3 V/µs slew rate defines how quickly the output can move under large-signal conditions. Its low, supply-independent current draw helps maintain system efficiency.
Typical uses include signal conditioning in industrial control systems, feedback and drive networks in power-conversion products, audio preamplifier stages, sensor interfaces, and general dual-amplifier modules. The tube packaging identified for LM2904DG4 is particularly appropriate for production assembly processes that use tube-fed through-hole or tube-to-tape conversion equipment.
When designing around the LM2904DG4, verify input and output common-mode limits at the selected supply voltage, provide adequate bypassing close to the supply pins, and confirm that the required signal bandwidth and output swing remain within the amplifier's operating limits. Stable operation also depends on appropriate feedback compensation for the selected gain and load.
This product page combines manufacturer specifications, package and pin information, engineering application guidance, and a structured comparison with compatible LM2904-family devices. It is designed to accelerate component selection and PCB planning while keeping the key trade-offs explicit.
直接替换替代料： LM2904DG4 ——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： LM2904DG4 （相同外形与封装尺寸） ——差异在于 Package, Slew Rate, Input Offset Voltage, Number of Channels.
LM2904BIDR
✅ 直接替换联系询价
查看数据手册 →LM2904BIDR
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →LM2904BA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
LM2904AYDT
✅ 直接替换📋 参考替代料（不在目录中）
LM2904DG4 最大额定值与电气特性
| Amplifier Type | General Purpose |
| Number of Circuits | 2 |
| Maximum Supply Voltage | 26 V |
| Single-Supply Operation | Up to 26 V |
| Dual-Supply Operation | Up to ±13 V |
| Gain-Bandwidth Product | 700 kHz |
| Slew Rate | 0.3 V/µs |
| Supply-Current Drain | 0.7 mA typical |
| Supply-Current Independence | Independent of supply voltage |
| Common-Mode Input Range | Includes ground |
| 封装 | 8-SOIC (0.154, 3.90 mm width) |
| Packaging | Tube |
| 安装类型 | Surface Mount |
LM2904DG4 引脚配置
| 引脚 1 | OUT1 — Output of amplifier 1 |
| 引脚 2 | -IN1 — Inverting input of amplifier 1 |
| 引脚 3 | +IN1 — Non-inverting input of amplifier 1 |
| 引脚 4 | V- — Negative supply connection |
| 引脚 5 | +IN2 — Non-inverting input of amplifier 2 |
| 引脚 6 | -IN2 — Inverting input of amplifier 2 |
| 引脚 7 | OUT2 — Output of amplifier 2 |
| 引脚 8 | V+ — Positive supply connection |
典型应用
LM2904DG4 适用于 6 应用s: Industrial Sensor Signal Conditioning, Power-Supply Feedback and Control, Audio Preamplifier Stages, Data-Acquisition Buffering, Motor and Actuator Control Interfaces, IoT and Smart-Device Analog Front Ends.
Industrial Sensor Signal Conditioning
The LM2904DG4 suits general-purpose sensor-amplifier stages that operate from industrial supply rails and need two independent amplifier channels. Its 700 kHz gain-bandwidth product supports moderate closed-loop bandwidth, while the 0.3 V/µs slew rate handles ordinary sensor transients. The common-mode input range includes ground, which is useful for signals referenced to the lower supply rail. The 26 V maximum supply rating provides headroom for 24 V industrial systems, although the datasheet limits must be observed during transients.
推荐
Power-Supply Feedback and Control
The LM2904DG4 can implement error-amplifier, current-feedback, and voltage-feedback functions in non-isolated power-conversion systems. Two channels allow separate feedback and monitoring functions within one 8-pin SOIC. Its low 0.7 mA typical supply-current drain remains independent of supply voltage, making it suitable for continuously powered control circuitry. Engineers should still verify output-current capability, saturation behavior, and loop stability against the power stage and its compensation network.
推荐
Audio Preamplifier Stages
The LM2904DG4 can be used in general-purpose audio preamplifier and mixing stages where full rail-to-rail performance is not required. Its 0.3 V/µs slew rate provides adequate response for many line-level audio signals, and the dual-channel configuration can process left and right channels consistently. The common-mode input range including ground is beneficial for single-supply audio boards. Output swing, noise, channel separation, and distortion should be checked in the manufacturer datasheet for the selected supply and load.
推荐
Data-Acquisition Buffering
The LM2904DG4 is appropriate for buffering moderately sourced sensor signals in data-acquisition front ends that do not require the precision of specialized instrumentation amplifiers. The 700 kHz gain-bandwidth product provides useful bandwidth for many slow sensor measurements, while two channels simplify differential or multi-signal layouts. Use local supply bypassing and careful grounding to minimize acquisition error, and confirm input offset voltage and bias-current requirements against the actual source impedance.
推荐
Motor and Actuator Control Interfaces
The LM2904DG4 can provide low-frequency error amplification, current-sense amplification, and actuator-feedback interfaces in industrial motor-control systems. Its 26 V supply capability is compatible with control electronics operating below that limit, and the 0.7 mA typical supply-current drain supports efficient auxiliary circuitry. Designers must account for motor-generated noise, ground transients, and input overvoltage. The device should not directly drive the motor or power stage unless its output-current and output-voltage limits are explicitly satisfied.
推荐
IoT and Smart-Device Analog Front Ends
The LM2904DG4 is useful in smart-device modules for amplifying sensor outputs, conditioning switch signals, or implementing analog filtering around a digital controller. Its two amplifiers reduce component count, while the 700 kHz gain-bandwidth product is adequate for many low-bandwidth IoT measurements. The common-mode range including ground supports sensors operating near the lower rail. For battery-powered products, evaluate total system quiescent current because the LM2904 contributes a 0.7 mA typical supply-current drain.
推荐
推荐产品汇总
工程参考数据： LM2904DG4 ——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 | LM2904BIDR | LM2904B | LM2904BA | LM2904AYDT | LM2904D |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics | Texas Instruments |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
关键差异点
- Dual general-purpose amplification in one package （对比 LM2904AYDT)
- Tube packaging supports tube-fed production assembly （对比 LM2904BIDR)
- Supply-independent low-current operation （对比 LM2904B)
设计说明
Place the input, output, feedback, and supply-bypass connections to keep loop area small. Connect the bypass capacitor directly between the appropriate supply pin and ground, then route the feedback network away from the supply traces and connector inputs. The two amplifier channels should have symmetrical grounding where signal timing matters, because shared supply and ground paths can otherwise introduce channel-to-channel coupling.
The 700 kHz gain-bandwidth product and 0.3 V/µs slew rate make the LM2904DG4 suitable for moderate-frequency signal paths rather than high-speed waveform systems. Check the intended closed-loop gain, load capacitance, output swing, and required bandwidth before assigning the amplifier. If the source impedance is high, compare the input bias current with the voltage error it can create, and add compensation only when the manufacturer-recommended configuration requires it.
Do not assume that every LM2904 ordering suffix is electrically and commercially interchangeable with LM2904DG4. Confirm the 8-pin SOIC pinout, temperature grade, package or reel code, lifecycle status, and tube quantity. For a functional substitution, also compare offset voltage, bias current, open-loop gain, output-current capability, common-mode limits, output swing, noise, and slew rate. The G4 suffix specifically identifies the tube-packaged ordering option.
合规信息
The LM2904 is a general-purpose operational amplifier rather than an automotive-qualified device. RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations require confirmation from current manufacturer or authorized-channel documentation.
