INA2141U - Dual 100V/µs Instrumentation Amplifier | Texas Instruments
MPN： INA2141U ✓ 啟用中INA2141U 概覽
An instrumentation amplifier is a precision analog signal-conditioning IC that amplifies the differential voltage between two inputs while rejecting common-mode interference. Its internal architecture provides high input impedance, accurate resistor-based gain, and strong common-mode rejection. In the electronic-component hierarchy, the INA2141U is a dual instrumentation amplifier within the broader amplifier IC and signal-conditioning categories.
Key features include a low maximum input bias current of 5 nA and a minimum common-mode rejection ratio of 117 dB. These characteristics suit sensor interfaces where source impedance, thermocouple voltages, and small bridge signals must be measured accurately. The low-power design also supports battery-powered instrumentation and compact test equipment where amplifier efficiency and low bias current influence overall system error.
The internal gain architecture offers a choice of 10 or 100 to match both moderate and high-sensitivity measurement ranges. A 1 MHz gain-bandwidth product supports signal bandwidth required by many industrial, medical, and laboratory systems, while the 4 V/µs slew rate improves large-signal response. Maximum input offset voltage of 50 µV and drift of 0.5 µV/°C limit errors in low-level DC measurements.
Typical uses include bridge excitation and readout, pressure and strain-gauge amplification, biopotential front ends, battery-powered sensor modules, current-shunt measurements, and precision data-acquisition systems. The 16-pin SOIC package allows conventional surface-mount assembly, while the dual-channel configuration can reduce board area when two differential inputs must be conditioned.
Designers should use the manufacturer pin-description table to assign input, feedback, reference, power, and output connections. Input filtering, reference-grounding, and supply-bypass placement require care because parasitic resistance can degrade CMRR and offset performance. Input protection ratings should not be interpreted as a substitute for external surge protection in hazardous or high-energy systems.
This page consolidates the key INA2141U specifications, verified package information, application guidance, and confirmed replacement references into a practical engineering comparison. It also distinguishes direct pin-compatible options from related INA214x devices whose gain and channel characteristics differ.
直接替換替代品，適用於 INA2141U — 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。
INA2141UG4
✅ 直接替換📋 參考替代品（不在目錄中）
INA2141UE4
✅ 直接替換📋 參考替代品（不在目錄中）
INA2141U 最大額定值與電氣特性
| Number of Channels | 2 channels |
| Device Type | Dual instrumentation amplifier |
| Selectable Gain | 10 or 100 |
| Gain-Bandwidth Product | 1 MHz |
| Slew Rate | 4 V/µs |
| Input Offset Voltage | 50 µV maximum |
| Input Offset Voltage Drift | 0.5 µV/°C maximum |
| Gain Error | ±0.05% maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection Ratio | 117 dB minimum |
| Input Protection Range | ±40 V |
| Supply Voltage Range | ±2.25 V to ±18 V |
| 封裝 | 16-pin SOIC (DW) |
| 安裝類型 | Surface mount |
INA2141U 16-pin soic (dw) 腳位配置指南
INA2141U（16-pin soic (dw) 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： INA2141U.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA2141U 適用於 6 應用s: Strain-Gauge Bridge Amplification, Battery-Powered Sensor Interface, Medical Biopotential Signal Conditioning, Industrial Pressure Transducer Readout, Precision Current-Shunt Measurement, Laboratory Data-Acquisition Front End.
Strain-Gauge Bridge Amplification
The INA2141U suits low-level differential bridge measurements because each channel supports gains of 10 or 100, with maximum input offset voltage of 50 µV and maximum offset drift of 0.5 µV/°C. Place the amplifier across the bridge output and use the reference input for midpoint scaling when the ADC requires a bipolar signal around a common operating voltage. The 5 nA maximum input bias current limits loading of high-impedance bridge arms, while common-mode rejection of at least 117 dB helps preserve small differential outputs in the presence of supply or ground variation.
推薦
Battery-Powered Sensor Interface
The low-power dual INA2141U is useful for portable sensor modules that measure small differential voltages without adding excessive bias-current error. Its maximum input bias current of 5 nA is particularly useful when the sensor source impedance is high, and the selectable gains of 10 and 100 provide flexibility across different signal ranges. Because two channels are integrated in one 16-pin SOIC, a battery-powered condition-monitoring device can condition two sensor inputs while conserving board area. The supply range of ±2.25 V to ±18 V supports both compact low-voltage systems and conventional bipolar industrial rails.
推薦
Medical Biopotential Signal Conditioning
The INA2141U can amplify low-amplitude differential biopotential signals in diagnostic and monitoring equipment when the design requires gains of 10 or 100. The 117 dB minimum common-mode rejection ratio helps suppress signals common to both electrodes, while the 50 µV maximum offset specification limits DC uncertainty at the amplifier input. A 1 MHz gain-bandwidth product accommodates a useful range of physiological bandwidth, and the 4 V/µs slew rate supports larger transient signals. Patient protection networks remain essential; the specified ±40 V input protection rating is not a substitute for dedicated clinical isolation and protection circuitry.
推薦
Industrial Pressure Transducer Readout
The INA2141U fits industrial pressure and force transducers that produce small differential outputs and may experience substantial common-mode voltage. Gain 10 can condition moderate sensor outputs, while gain 100 increases sensitivity for low-level millivolt-range signals. Common-mode rejection of at least 117 dB helps reject process-related interference, and the dual-channel arrangement allows a pressure channel and a temperature or calibration channel to share one package. The 16-pin SOIC is readily assembled in industrial control equipment, although protection, isolation, and surge-current requirements must be handled separately according to the installation environment.
推薦
Precision Current-Shunt Measurement
The INA2141U can measure the voltage generated across a precision current shunt when low offset, drift, and common-mode rejection are important. A gain of 10 or 100 scales the shunt differential voltage without requiring an external gain network, while the 5 nA maximum input bias current is generally small compared with the shunt impedance. The 1 MHz bandwidth and 4 V/µs slew rate provide useful response for many power-conversion and laboratory current measurements. For high-side shunt systems, verify common-mode limits and input protection because the actual operating voltage must remain inside the amplifier's supported electrical limits.
推薦
Laboratory Data-Acquisition Front End
The INA2141U provides a compact precision front end for laboratory instruments that acquire small differential signals. Its maximum offset voltage of 50 µV and maximum gain error of ±0.05% make it appropriate for gain-sensitive measurements, while 1 MHz bandwidth covers many general-purpose waveform and sensor channels. Two independent channels in one 16-pin SOIC can simplify multi-channel acquisition boards, while selectable gain reduces the need for multiple amplifier packages. The reference and feedback connections should follow the manufacturer application guidance, and input filtering should be designed carefully to preserve the intended bandwidth.
推薦
推薦產品摘要
工程參考資料，適用於 INA2141U — 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 | INA2141UG4 | INA2141UE4 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-16 (DW) | SOIC-16 (DW) - same | SOIC-16 (DW) - same |
| Number of Channels | 2 channels | 2 channels | 2 channels |
| Selectable Gain | 10 or 100 | 10 or 100 | 10 or 100 |
| Gain-Bandwidth Product | 1 MHz | 1 MHz | 1 MHz |
| Slew Rate | 4 V/µs | 4 V/µs | 4 V/µs |
| Maximum Input Offset Voltage | 50 µV | 50 µV | 50 µV |
| Maximum Input Bias Current | 5 nA | 5 nA | 5 nA |
| Minimum Common-Mode Rejection Ratio | 117 dB | 117 dB | 117 dB |
| Supply Voltage Range | ±2.25 V to ±18 V | ±2.25 V to ±18 V | ±2.25 V to ±18 V |
| Input Protection Range | ±40 V | ±40 V | ±40 V |
| Orderable Grade | INA2141U standard grade | G4 grade | E4 grade |
主要差異化特點
- Two precision channels in one 16-pin package (對比INA2141UG4)
- Selectable gain covers 10 and 100 in each channel (對比INA2141UE4)
- Low offset suitable for millivolt-level measurement (對比INA2141UG4)
設計說明
Place the input, feedback, reference, and bypass connections directly to their associated package pins. Keep input traces short and symmetrical to reduce parasitic capacitance and conversion of common-mode noise into differential error. Connect the supply bypass capacitor close to the supply pins and follow the reference configuration shown in the manufacturer application guidance. The exposed relationships between gain-setting pins and feedback links must be checked against the datasheet pin table before layout release.
The INA2141U's 117 dB minimum common-mode rejection ratio is valuable only if the PCB does not introduce additional asymmetry. Use matched input routing, clean grounding, and symmetrical filtering for differential signals. Avoid long parallel runs near switching nodes, and place the analog ground return near the amplifier rather than routing it through high-current return paths. These practices reduce leakage imbalance, thermoelectric offsets, and noise that would otherwise consume the device's common-mode and offset performance.
The supported supply range is ±2.25 V to ±18 V, so verify that startup, transients, and fault conditions remain within the absolute-maximum limits. Add local supply bypassing and use controlled power sequencing when the amplifier shares a rail with sensitive converters. The stated ±40 V input protection capability must not be treated as permission to exceed the normal operating voltage; external series impedance or dedicated protection may be required for sustained overvoltage events.
Do not select the gain only from nominal signal amplitude. Include sensor output error, ADC input range, reference voltage, offset drift, and common-mode headroom in the calculation. A gain of 100 may amplify offset and noise as well as the intended differential signal. Verify the selected operating mode against the manufacturer gain-setting table, and avoid treating the related INA2142, INA2143, or INA2144 devices as direct replacements when their gain options do not match the INA2141U.
合規資訊
The available product information does not state the complete compliance profile for INA2141U. Check the current Texas Instruments declarations and ordering documentation for the exact orderable part before making a compliance claim.
