LM2904DR2GH - Dual 1MHz Op Amp, 3-32V Supply, SOIC-8 | onsemi
料号： LM2904DR2GH ✓ 量产中LM2904DR2GH 概述
An operational amplifier is a high-gain differential amplifier whose inverting and non-inverting inputs are compared, producing an output that drives the difference between them. The dual-amplifier form factor halves board area for common tasks such as buffer and gain stages, level shifting, active filters, transducers, and sensor conditioning. In the power-management hierarchy, op amps sit alongside regulators and references as fundamental analog building blocks, and the LM2904 family is one of the most widely cloned dual general-purpose amplifier families in the industry.
Key features of the LM2904DR2GH include short-circuit-protected outputs, a true differential input stage, internally compensated operation (no external compensation network required), low input bias currents, and ESD clamps on the inputs that improve ruggedness without degrading signal integrity. Because the amplifier is internally compensated, it is stable with unity-gain noise gain, which simplifies feedback design in buffer and general-purpose configurations.
The common-mode input range extending to the negative supply is the defining architectural advantage in single-supply systems. The input stage can operate with signals referenced near 0 V while the device runs from a single positive rail, removing the need for a negative bias supply or an artificial ground in sensor, audio, and industrial instrumentation circuits. Internally, the part combines a differential input pair with a class-A/AB output stage that delivers rail-to-rail output swing close to the supply limits at light to moderate loads.
Typical applications include low-side current sensing with shunt amplifiers, audio preamplifier and mixer stages, active filters for sensor signals, comparators and threshold detectors, bridge and strain-gauge instrumentation, relay and solenoid drive feedback, and general industrial control signal conditioning. The wide 32 V supply ceiling also suits 24 V industrial bus rails that need headroom for transients.
One key design consideration is that the 1 MHz gain-bandwidth product limits closed-loop bandwidth to roughly the gain-bandwidth divided by the noise gain. Use a current-feedback or faster rail-to-rail device when the signal bandwidth exceeds roughly 100 kHz at higher closed-loop gains, and keep layout short to avoid parasitic capacitance on the inverting input that can destabilize the amplifier.
This page consolidates manufacturer feature data, pin-level detail, drop-in replacement options, and practical layout guidance so that engineers can qualify the LM2904DR2GH for both new designs and repair or obsolescence-driven redesigns.
直接替换替代料： LM2904DR2GH ——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： LM2904DR2GH （相同外形与封装尺寸） ——差异在于 Package, Slew Rate, Mounting Type, Amplifier Type, Input Offset Voltage.
LM358DR2G
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →LM2904DR
✅ 直接替换联系询价
查看数据手册 →LM358DR
✅ 直接替换联系询价
查看数据手册 →LM2904D
✅ 直接替换联系询价
查看数据手册 →NJM2904D
✅ 直接替换📋 参考替代料（不在目录中）
LM358DT
✅ 直接替换✗ 无现货
$0.0509 / 个
查看数据手册 →LM358N
✅ 直接替换联系询价
查看数据手册 →LM2904DR2GH 最大额定值与电气特性
| Number of Channels | 2 (dual) |
| Amplifier Type | General Purpose Operational Amplifier |
| Gain-Bandwidth Product | 1 MHz |
| Single Supply Voltage Range | 3.0 V to 32 V |
| Common Mode Input Range | Extends to negative supply |
| Compensation | Internally compensated |
| Input Stage | True differential input stage |
| Output Protection | Short-circuit protected outputs |
| Input Protection | ESD clamps on inputs |
| 封装 | SOIC-8 (D), 8 pins |
| 安装类型 | Surface Mount |
| Output Swing | Rail-to-rail output swing (approximate) |
| RoHS 状态 | Compliant |
| Shipping Format | Tape and Reel |
LM2904DR2GH 引脚配置
| 引脚 1 | OUTA — Amplifier A output |
| 引脚 2 | IN-A — Amplifier A inverting input |
| 引脚 3 | IN+A — Amplifier A non-inverting input |
| 引脚 4 | V- — Negative supply (ground in single-supply operation) |
| 引脚 5 | IN+B — Amplifier B non-inverting input |
| 引脚 6 | IN-B — Amplifier B inverting input |
| 引脚 7 | OUTB — Amplifier B output |
| 引脚 8 | V+ — Positive supply input |
典型应用
LM2904DR2GH 适用于 6 应用s: Low-Side Current Sensing, Industrial Sensor Signal Conditioning, Audio Preamplifier and Mixer Stages, Active Filters and Oscillators, Threshold Detection and Comparators, Power Supply Feedback and Load-Line Control.
Low-Side Current Sensing
The LM2904DR2GH suits shunt-based current sensing because its true differential input stage rejects common-mode voltage on the sense resistor while the common-mode range extends to the negative supply. At the 1 MHz gain-bandwidth product, a gain of 100 still offers roughly 10 kHz of closed-loop bandwidth, which is more than enough for motor and power-supply current loops sampled at kilohertz rates. Place the amplifier directly across the shunt, keep the sense traces short and paired, and connect the unused channel as a buffer for the reference node. Because the input bias current is specified as low, the error contribution from the shunt divider resistors stays small even at kiloohm shunt values.
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Industrial Sensor Signal Conditioning
On 24 V industrial buses, the LM2904DR2GH benefits from a 3.0 V to 32 V single-supply range that tolerates rail transients without separate protection on the amplifier itself. The device buffers thermocouple, RTD, and bridge-transducer outputs, and its common-mode input range reaching the negative supply lets it process signals referenced to 0 V on a single positive rail. Internal compensation keeps the stage stable as a unity-gain buffer without added network components. For slow industrial signals the 1 MHz bandwidth is generous, so the design emphasis shifts to layout: route the high-impedance input as a short, guarded trace and place a 100 nF bypass capacitor at each supply pin.
推荐
Audio Preamplifier and Mixer Stages
The LM2904DR2GH works well in small-signal audio paths where a general-purpose bipolar amplifier is sufficient. Its 1 MHz gain-bandwidth product supports midband gain stages up to roughly 10 kHz, and the dual channel lets one IC serve as both a microphone preamplifier and a summing mixer channel in a compact stereo board. Because the input stage is truly differential, the amplifier can be configured as a differential summer or an inverting mixer without extra instrumentation amplifiers. Keep the gain moderate to limit distortion, and note that the device is not rail-to-rail on the inputs, so bias the source around mid-supply when the input signal can reach the rails.
推荐
Active Filters and Oscillators
With the LM2904DR2GH, engineers can build second-order Sallen-Key and multiple-feedback active filters around the 1 MHz gain-bandwidth product, giving usable passbands of roughly 10 kHz at moderate closed-loop gains. The internal compensation means each amplifier is unity-gain stable, so the filter topology can be built with equal component values for a Butterworth response. The same amplifiers support relaxation and sine oscillators for audio or instrumentation test points. Choose resistor values in the 10 kOhm to 100 kOhm range to keep resistor noise and thermal effects balanced against the specified low input bias current, and check the resulting closed-loop gain against the gain-bandwidth product before finalising the corner frequency.
推荐
Threshold Detection and Comparators
The LM2904DR2GH works as a comparator in many cost-sensitive designs because its outputs are short-circuit protected and its input stage tolerates signals from the negative supply upward. A resistive divider on the non-inverting input and a reference on the inverting input yields a clean open-collector-style pull-down arrangement when the output is configured with an external pull-up. The 1 MHz bandwidth makes the switching response fast enough for supply sequencing, battery monitoring, and over/under-voltage detection on 24 V rails. For safety-critical cutoff functions prefer a dedicated supervisor IC with guaranteed propagation delay and hysteresis, and account for output saturation recovery time when the comparator is used in a fast feedback loop.
推荐
Power Supply Feedback and Load-Line Control
In regulated power supply designs, the LM2904DR2GH can implement the error amplifier, remote sense amplifier, or load-line control loop. Its differential input stage accurately compares a feedback divider against a reference, and the wide 32 V supply ceiling allows direct connection to a 24 V primary-derived rail without level shifting. The common-mode input range that reaches the negative supply simplifies designs where the feedback node sits near 0 V. Because the device is not a dedicated PWM error amplifier, compensation must be added around it for the control loop, and the 1 MHz gain-bandwidth product is adequate for loop compensation in most low-frequency regulators but not for high-switching-rate synchronous converters with very fast loops.
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推荐产品汇总
工程参考数据： LM2904DR2GH ——对比、设计指导和合规信息。
选型指南
Choose the onsemi LM358DR2G or the STMicroelectronics LM358DT if you want rail-to-rail output swing on low-voltage rails and your supply stays below 30 V; those parts are typically preferred in battery-powered and portable designs. Choose the Texas Instruments LM2904DR or NXP LM2904D only when the 26 V supply ceiling and the lower gain-bandwidth still cover your design, often because of regional supply reasons. The NJRC NJM2904D is a pin-to-pin option for cost-driven designs that need a wider supply headroom. In every case, confirm the input offset voltage, input bias current, output swing, and stability against your actual feedback network before releasing the schematic.
与替代料对比
| 参数 | 本产品 | LM358DR2G | LM2904DR | LM358DR | LM2904D | NJM2904D | LM358DT | LM358N |
|---|---|---|---|---|---|---|---|---|
| Brand | onsemi | onsemi | Texas Instruments | Texas Instruments | NXP Semiconductors | NJRC | STMicroelectronics | STMicroelectronics |
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Maximum Supply Voltage | 32 V | 30 V (-6%) | 26 V (-19%) | 30 V (-6%) | 26 V (-19%) | 36 V (+13%) | 30 V (-6%) | 30 V (-6%) |
| Compensation | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated | Internally compensated |
关键差异点
- Wider single-supply ceiling than most dual general-purpose alternatives （对比 LM2904DR (Texas Instruments))
- Higher gain-bandwidth product in the same footprint （对比 LM2904DR (Texas Instruments))
- Common-mode input range reaching the negative supply rail （对比 LM358DT (STMicroelectronics))
- True differential input stage with ESD clamps on the inputs （对比 NJM2904D (NJRC))
设计说明
Treat the inverting input as a high-impedance node. Keep the trace from pin 2 and pin 6 to the feedback resistor as short as possible, and avoid running it parallel to the output trace, which capacitively feeds forward and can destabilise the loop at the 1 MHz gain-bandwidth limit. Place the 100 nF bypass capacitor directly at pins 4 and 8 and add a bulk capacitor near the supply entry point. On boards with long supply routes, a series ferrite or small resistor between the source and the amplifier supply pin limits injected surge current that could trip the output protection.
Estimated: with a 24 V supply, a 5 V output, and a 10 mA load, the LM2904DR2GH dissipates approximately (24 V - 5 V) x 0.01 A = 0.19 W, and the device's own quiescent current adds roughly 0.1 W in the SOIC-8 package. That is well within the SOIC-8 thermal capability with normal copper pour, so no heat sinking is needed. Verify against the quiescent current and output-stage quiescent dissipation figures in the manufacturer datasheet for the exact temperature grade before finalising the thermal budget, since a 32 V rail at higher load currents raises dissipation quickly.
Do not assume the inputs can swing to the positive supply rail. The LM2904 input stage is not rail-to-rail on the input side, so a signal that approaches V+ may cause the output to clip asymmetrically and shift the input offset. Bias inputs around mid-supply when the source can exceed the supply, and keep the total supply below 32 V including transients. Also remember that the two amplifiers share one supply pair: a fault or load on channel B can pull the supply rail and upset channel A on the same board.
Avoid using this amplifier as a comparator on signals that slew faster than the 1 MHz gain-bandwidth product allows, because saturation recovery can add microseconds of delay and cause relay or protection chattering. For precision thresholding with guaranteed propagation delay, choose a dedicated comparator or supervisor IC instead. If the amplifier is used in a feedback loop around a switching stage, add a small isolation resistor at the inverting input to damp the pole formed by stray capacitance, and confirm stability with an AC analysis of the closed-loop gain rather than by calculation alone.
合规信息
The onsemi 'G' ordering suffix denotes a RoHS-compliant, lead-free finish. REACH, halogen-free status, and conflict-minerals declarations are not stated on the part pages used for this listing, so they are left as unknown. This part is a general-purpose commercial device and is not AEC-Q100 qualified.
