INA2141U - Dual 100V/µs Instrumentation Amplifier | Texas Instruments
部品番号: INA2141U ✓ 生産中INA2141U 概要
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.
ドロップイン代替品: INA2141U — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
INA2141UG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA2141UE4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA2141U 最大定格＆電気的特性
| 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 |
| パッケージ | 16-pin SOIC (DW) |
| 実装タイプ | Surface mount |
INA2141U 16-pin soic (dw) ピン配置ガイド
INA2141U (16-pin soic (dw) パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: INA2141U.
詳細は データシート をご参照ください。
主な用途
INA2141U の用途: 6 件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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: INA2141U — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Two precision channels in one 16-pin package （vs INA2141UG4)
- Selectable gain covers 10 and 100 in each channel （vs INA2141UE4)
- Low offset suitable for millivolt-level measurement （vs INA2141UG4)
設計ノート
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.
コンプライアンス情報
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.
