OPA241UA - 25µA Micro-Power Op Amp | Texas Instruments
MPN： OPA241UA ✓ 啟用中OPA241UA 概覽
An operational amplifier is a voltage-feedback analog building block that amplifies the difference between two input voltages while presenting high input impedance and low output impedance. The OPA241 belongs to the low-dropout, micropower operational-amplifier hierarchy within analog and mixed-signal semiconductors. Its low operating current makes it suitable for sensor interfaces, portable instrumentation, battery monitoring, and low-duty-cycle control systems where continuous amplifier power would dominate the system budget.
The principal operating characteristics are a 25 µA supply current, 35 kHz gain-bandwidth product, 0.01 V/µs slew rate, and operation from a single 5 V supply. The device also provides rail-to-rail output swing, which increases usable output range on low-voltage rails. Low offset voltage supports accurate amplification of small sensor signals, while the high common-mode rejection ratio reduces sensitivity to supply and ground-disturbance signals. A unity-gain bandwidth of 35 kHz makes the amplifier appropriate for low-frequency signal conditioning rather than high-speed waveform processing.
OPA241UA is a single-amplifier implementation in the broader OPAx241 family, alongside the OPA2241 and OPA4241 dual and quad versions. The family targets portable applications where low power consumption, common-mode range, and output swing are more important than wideband performance. Single-supply operation also simplifies battery-powered design, while the small SOIC package supports conventional surface-mount assembly.
Typical uses include low-power sensor amplification, portable measurement equipment, battery-current monitoring, industrial signal conditioning, and low-leakage sensing interfaces. In these applications, the amplifier can sit close to a sensor and condition its output before conversion or transmission. The 35 kHz bandwidth is adequate for slow physiological, temperature, pressure, and position signals, but it is not intended for high-speed communications, pulse shaping, or precision audio workloads.
For a new design, verify the signal bandwidth, output load, common-mode range, and stability requirements against the manufacturer datasheet. Place the bypass capacitor close to the supply pins and avoid capacitive loading that can reduce phase margin. The low-current advantage should also be checked against the complete analog signal chain, since additional amplifiers, converters, and protection devices can consume more power than the OPA241UA itself.
This product page consolidates the manufacturer specifications, commercial sourcing guidance, package details, cross-reference alternatives, and application-focused engineering notes. It supports faster part selection by connecting the OPA241UA electrical limits with practical low-power circuit requirements rather than repeating only the basic ordering information.
直接替換替代品，適用於 OPA241UA — 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： OPA241UA （相同外形與佔位） — 差異在於 Amplifier Type, Number of Channels, Operating Temperature Range, Package, Slew Rate.
OPA241UAG4
✅ 直接替換📋 參考替代品（不在目錄中）
AD8676ARZ
✅ 直接替換聯絡詢價
查看資料表 →LT6015
✅ 直接替換📋 參考替代品（不在目錄中）
MAX44246
✅ 直接替換📋 參考替代品（不在目錄中）
OPA241UA 最大額定值與電氣特性
| Amplifier Type | Single operational amplifier |
| Supply Type | Single supply |
| Nominal Supply Voltage | 5 V |
| 靜態電流 | 25 µA |
| Gain-Bandwidth Product | 35 kHz |
| Slew Rate | 0.01 V/µs |
| Supply Voltage Range | ±1.35 V to ±18 V |
| Output Swing | Rail-to-rail |
| Offset Voltage | Low |
| Common-Mode Rejection | High |
| Open-Loop Gain | High |
| Number of Channels | 1 channel |
| 腳位數 | 8 pins |
| 封裝 | 8-pin SOIC |
| 安裝類型 | Surface mount |
| Application | Battery-powered portable applications |
| 工作溫度範圍 | -40 °C to +85 °C |
OPA241UA 8-pin soic 腳位配置指南
OPA241UA（8-pin soic 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： OPA241UA.
請參閱 資料表 以查看完整腳位配置。
典型應用
OPA241UA 適用於 6 應用s: Battery-Powered Sensor Interfaces, Portable Medical Instrumentation, Industrial Process Measurement, Battery Current Monitoring, Low-Power Data Acquisition, Precision Voltage Buffering.
Battery-Powered Sensor Interfaces
The OPA241UA is suitable for conditioning outputs from temperature, pressure, position, and electrochemical sensors in battery-operated equipment. Its 25 µA quiescent current limits the amplifier's contribution to standby power, while the 35 kHz gain-bandwidth product accommodates slow sensor signals without requiring a wideband amplifier. Place the device close to the sensor and use local supply bypassing to minimize sensitive traces and susceptibility to external interference. The rail-to-rail output can improve signal range on low-voltage rails, although the complete input and output ranges must remain within the datasheet limits for the selected gain and load.
推薦
Portable Medical Instrumentation
The OPA241UA can amplify low-level physiological or diagnostic signals in portable instruments where every microamp of supply current affects battery life. Its 25 µA quiescent current, low offset voltage, high common-mode rejection, and high open-loop gain support accurate amplification around a low-voltage analog front end. The 35 kHz bandwidth is appropriate for many ECG, pressure, and biochemical monitoring waveforms that remain below the amplifier's useful frequency range. Verify electrode protection, input bias-current error, patient-safety isolation, and applicable medical requirements independently of the amplifier's electrical performance.
推薦
Industrial Process Measurement
OPA241UA suits low-frequency industrial sensor chains where a 24 V source must be reduced to a compact, low-energy analog signal. Although the device is identified for 5 V single-supply operation, its documented supply range permits other suitable operating rails. The 25 µA supply current reduces power in remote monitoring loops, and the 0.01 V/µs slew rate supports slow process variables with reasonable small-signal bandwidth. Add protection against industrial transients and verify the exact input common-mode range, output swing, and grounding strategy before connecting field-wired sensors.
推薦
Battery Current Monitoring
The OPA241UA can amplify the voltage across a low-value shunt when monitoring current consumption in a portable battery system. Its low 25 µA supply current prevents the measurement amplifier from materially changing the load being measured, while low offset voltage supports accurate recovery of small voltage differences. The 35 kHz bandwidth is suitable for relatively slow charge and discharge current profiles rather than fast pulse currents. Use a Kelvin connection, high-side or low-side topology appropriate to the system ground, and an input filter sized against the shunt impedance and amplifier noise requirements.
推薦
Low-Power Data Acquisition
OPA241UA is useful in compact, low-duty-cycle data-acquisition systems that amplify sensor outputs before conversion and control overall energy use. The 25 µA quiescent current is beneficial when the acquisition node must operate throughout a long battery life, and the single 5 V supply simplifies system partitioning. The 35 kHz gain-bandwidth product is sufficient for many environmental, occupancy, and condition-monitoring inputs but not for high-speed vibration analysis. Select the gain and output range for the converter, account for settling time, and preserve a clean analog return path between the sensor, amplifier, and converter.
推薦
Precision Voltage Buffering
OPA241UA can provide voltage buffering and gain for low-level reference or control signals in compact portable equipment. Its high open-loop gain reduces output error when driving a moderate load, while low offset voltage helps preserve small reference levels. The rail-to-rail output increases the available range near the supply rails, and the 0.01 V/µs slew rate is sufficient for slowly changing control or measurement nodes. Confirm stability with the intended load capacitance, avoid excessive resistive loading, and use the datasheet's input common-mode and output-swing limits when operating near either rail.
推薦
推薦產品摘要
工程參考資料，適用於 OPA241UA — 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 | OPA241UAG4 | AD8676 | LT6015 | MAX44246 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices | Maxim Integrated |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
主要差異化特點
- Very low supply demand for a general-purpose operational amplifier (對比OPA241UAG4)
- Single 5 V supply operation with rail-to-rail output (對比AD8676)
- Focused low-frequency signal-conditioning bandwidth (對比MAX44246)
設計說明
Budget the OPA241UA's 25 µA quiescent current together with output-current demand and the power consumed by surrounding circuitry. A nominally low-current amplifier can still raise total system consumption after accounting for sensor biasing, bypass leakage, conversion electronics, and protection components. Where the system operates intermittently, evaluate whether the shutdown behavior of the upstream circuit can provide a larger saving than selecting a marginally lower-current amplifier.
Place the supply bypass capacitor immediately beside the OPA241UA power pins and route the return directly to the device ground. Keep sensitive input traces short, away from switching-node and high-current return paths. Because the gain-bandwidth product is 35 kHz, the circuit is intended for slow signals, but correct grounding and local decoupling still determine whether offset, interference, and supply ripple appear as gain or common-mode errors.
Do not assume that rail-to-rail output swing permits operation at or beyond either supply rail. Check the input common-mode range, output swing under the intended load, gain setting, and minimum supply voltage from the manufacturer datasheet. Likewise, verify capacitive-load stability before connecting long cables, large filter capacitors, or ADC sampling inputs directly to the output.
合規資訊
The Texas Instruments product and ordering pages identify OPA241UA as active in an 8-pin SOIC package with a -40 °C to +85 °C operating range. Specific environmental and material compliance declarations were not present in the cited excerpts and require confirmation from the manufacturer.