LM2904F-E2 - Dual Ground-Sense Op Amp, 3-32V | ROHM Semiconductor
MPN： LM2904F-E2 ✗ 停產LM2904F-E2 概覽
A ground-sense operational amplifier is an op-amp configuration designed to measure or amplify small voltage signals referenced to ground, especially signals whose lower operating range is close to 0V. The LM2904 family combines two amplifiers in one package, allowing each channel to be used independently for signal conditioning, buffering, or low-level voltage amplification. Its wide supply-voltage range allows operation from 3V single-supply systems through higher-voltage industrial control and instrumentation circuits.
The verified product information identifies the LM2904F-E2 as a standard general-purpose amplifier with two circuits, an 8-SOP package, and a 3V to 32V operating supply range. ROHM's product page also identifies the device as a ground-sense operational amplifier and states that it cannot be used for new designs. The -E2 suffix denotes the manufacturer's ordering or packaging designation, while the F variant identifies the ground-sense amplifier family.
Typical uses include current-sense signal conditioning, sensor-interface circuits, low-voltage control systems, and instrumentation in which the input signal can approach the negative supply rail. The dual configuration can reduce board area when two related analog channels are required. The 8-pin SOP package is also compatible with conventional through-hole and leaded assembly processes, although current designs should confirm the availability and lifecycle status of the exact suffix before committing a new production release.
Designers should review the manufacturer datasheet for the complete electrical limits, input common-mode behavior, output swing, bias-current specifications, noise values, compensation stability, and recommended decoupling. A stable bypass capacitor should be placed close to the supply pins, and unused input channels should be handled according to the datasheet's recommended configuration. Because the manufacturer does not recommend this part for new designs, engineers should normally evaluate a current recommended dual operational amplifier with the same 8-pin footprint and equivalent electrical performance.
This page combines the manufacturer product information, distributor identification, lifecycle notice, package data, and practical engineering guidance for engineers evaluating the LM2904F-E2 or searching for a compatible replacement.
直接替換替代品，適用於 LM2904F-E2 — 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： LM2904F-E2 （相同外形與佔位） — 差異在於 Package, Mounting Type, Amplifier Type, Number of Channels, Input Offset Voltage.
LM2904F
✅ 直接替換📋 參考替代品（不在目錄中）
LM2904DR
✅ 直接替換聯絡詢價
查看資料表 →LM2904BIDR
✅ 直接替換聯絡詢價
查看資料表 →LM2904LV
✅ 直接替換📋 參考替代品（不在目錄中）
LM2904F-E2 最大額定值與電氣特性
| Amplifier Type | Dual ground-sense operational amplifier |
| Number of Circuits | 2 circuits |
| Operating Supply Voltage Range | 3V to 32V |
| 封裝 | 8-pin SOP |
| Product Classification | Standard general-purpose amplifier |
| Lifecycle Recommendation | Not recommended for new designs |
| Design Diversion Status | Not recommended for design diversion |
| 安裝類型 | Surface mount, 8-pin SOP |
LM2904F-E2 8-pin sop 腳位配置指南
LM2904F-E2（8-pin sop 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： LM2904F-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2904F-E2 適用於 6 應用s: Current-Sense Signal Conditioning, Low-Voltage Sensor Interface, Industrial Control Signal Amplification, Battery and Portable Monitoring, Audio and Instrumentation Buffering, Power-Supply Feedback and Monitoring.
Current-Sense Signal Conditioning
The LM2904F-E2 is suitable for amplifying the small voltage produced by a low-value current-sense resistor when the signal is referenced near ground. Its ground-sense architecture is relevant to battery, motor, and industrial control circuits where the measured voltage can remain close to the lower rail. Place the amplifier in the appropriate non-inverting or inverting topology, maintain the input within the datasheet common-mode range, and check offset voltage against the resolution required by the measurement. The 3V-to-32V supply range permits operation across low-voltage and higher-voltage instrumentation systems.
推薦
Low-Voltage Sensor Interface
Use the LM2904F-E2 when a sensor produces a millivolt-level output close to ground and requires amplification before conversion or control processing. The ground-sense characteristic helps preserve signal information near the lower supply rail, while the dual-circuit package allows two related sensor channels to share one package. Check the sensor output range, input bias current, offset voltage, and noise requirements against the manufacturer datasheet. Decoupling capacitors should be placed close to the supply pins, and the feedback network should be designed for the intended closed-loop gain.
推薦
Industrial Control Signal Amplification
The LM2904F-E2 can amplify low-level control or feedback signals in industrial systems whose analog node is close to ground. The 3V-to-32V operating supply range supports a broad range of control-board supply conditions, while the two independent channels can handle related measurements. The device is not recommended for new designs, so engineers should use it for qualified legacy maintenance or evaluate a current recommended amplifier for new control platforms. Confirm the operating-temperature range, output swing, capacitive-load behavior, and electromagnetic robustness in the datasheet and system qualification plan.
推薦
Battery and Portable Monitoring
The LM2904F-E2 can condition voltage-divided battery-monitoring signals when the measured level approaches the ground rail. Its low-side signal capability makes it relevant to portable equipment, battery-management boards, and energy-monitoring systems that use a resistive divider or shunt. The 3V minimum supply is useful for compact systems, but the exact quiescent current and operating-temperature limits must be checked before power-budget approval. For new portable products, verify current recommended alternatives because the manufacturer has designated LM2904F-E2 as not recommended for new designs.
推薦
Audio and Instrumentation Buffering
The LM2904F-E2 can serve as a general-purpose amplifier or buffer in instrumentation where the signal level is small and the reference is ground-centered. The dual amplifier arrangement can reduce the number of packages when two channels require similar conditioning. However, the verified product information does not specify noise, bandwidth, slew rate, or output swing, so audio or precision-instrumentation designs should compare those parameters directly against the manufacturer datasheet. Check stability with the intended source and load capacitances and verify that the selected replacement improves noise rather than only matching the package.
推薦
Power-Supply Feedback and Monitoring
The LM2904F-E2 can be used to amplify a feedback or monitoring voltage in a power-conversion system, particularly when the signal is close to ground and the amplifier must operate from a single supply. The 3V-to-32V supply range provides flexibility across control and auxiliary rails. Because the exact output swing, input common-mode limits, and quiescent current are not stated in the product-page excerpt, verify those values before using the device in a feedback loop. Add local supply bypassing and keep the feedback trace away from high-current switching paths.
推薦
推薦產品摘要
工程參考資料，適用於 LM2904F-E2 — 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 | LM2904F | LM2904 | LM2904B | LM2904LV | LM2904P3 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOP | 8-pin SOP - same package family | 8-pin SOIC - equivalent leaded footprint family | 8-pin SOIC - equivalent leaded footprint family | 8-pin SOIC - equivalent leaded footprint family | 8-pin SOIC - equivalent leaded footprint family |
| Brand | ROHM Semiconductor | ROHM Semiconductor | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Dual | Dual | Dual | Dual | Dual | Dual |
| Number of Circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits | 2 circuits |
主要差異化特點
- Ground-sense positioning (對比LM2904P3)
- Wide single-supply operating range (對比LM2904B)
- Dual-channel integration (對比LM2904)
- Legacy-product status (對比LM2904F)
設計說明
Do not treat the 3V-to-32V supply rating as permission to ignore the input common-mode or output-swing limits. The ground-sense feature is valuable only when the signal remains inside the amplifier's valid input and output ranges. Before making a substitution, compare the original device's offset voltage, bias current, common-mode range, output swing, noise, bandwidth, and stability limits with the candidate datasheet.
Place the supply bypass capacitor as close as practical to the device's supply pins and ground connection. Keep the feedback and input traces short, particularly when the amplifier drives a capacitive or high-impedance load. Use a solid ground-plane connection and keep analog input routing away from switching nodes and high-current return paths to reduce ground disturbance in low-level signal-conditioning circuits.
The LM2904F-E2 is intended for low-current general-purpose signal conditioning, but the exact quiescent current and output-drive limits are not stated in the verified product excerpt. Verify the datasheet values against the system's power budget and output-load requirements. For battery-powered designs, calculate the supply current at both standby and operating states and include the effect of the external feedback network.
The 8-pin SOP package provides limited thermal dissipation compared with larger power packages. Check the operating ambient temperature, maximum input-output voltage difference, load current, and the manufacturer's thermal information before using the amplifier in a continuously loaded or high-voltage condition. For new designs, verify the replacement's thermal resistance and package land pattern rather than assuming that an 8-pin outline is interchangeable.
合規資訊
The verified manufacturer and distributor excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The manufacturer states that LM2904F-E2 is not recommended for new designs and not recommended for design diversion.
