INA2141P - Dual G=10/100 Instrumentation Amplifier | Texas Instruments
部品番号: INA2141P ✓ 生産中INA2141P 概要
An instrumentation amplifier is a specialized analog amplifier optimized for measuring low-level differential signals, such as sensor outputs, while rejecting common-mode noise and voltage. Unlike a general-purpose operational amplifier, an instrumentation amplifier provides high input impedance, consistent gain accuracy, and strong common-mode rejection in a single integrated circuit. The INA2141 family is a dual instrumentation amplifier, so one package can process two independent channels.
The INA2141P supports two fixed gain settings, 10 and 100, and uses current-feedback input circuitry to maintain bandwidth at higher gain. The manufacturer datasheet states that bandwidth reaches 200 kHz at a gain of 100. Low offset voltage is specified at 50 µV maximum, with maximum drift of 0.5 µV/°C and gain accuracy of ±0.05%. Common-mode rejection reaches 117 dB minimum at a gain of 100.
The device accepts supply voltages as low as ±2.25 V and operates with supplies up to ±18 V. Input protection extends to ±40 V, helping the amplifier withstand overload conditions in sensor interfaces and industrial measurement systems. Quiescent current is approximately 750 µA per amplifier, making the device suitable for low-power and battery-operated instrumentation.
Typical uses include bridge-sensor and pressure-transducer interfaces, medical monitoring, industrial process measurement, current-loop sensing, and laboratory instrumentation. Because the INA2141P is a dual amplifier, it is especially useful for paired sensors or two-stage measurement systems where board area and power consumption are important.
Designers should verify the gain-setting resistor configuration, reference-voltage implementation, input common-mode range, and supply headroom against the datasheet before layout. Decoupling capacitors should be placed close to the supply pins, and the analog input traces should be routed away from switching nodes. The manufacturer datasheet also provides application guidance for gain selection, bandwidth, and input protection.
This page combines the verified manufacturer and distributor information for INA2141P with package-level guidance, application context, and design considerations that help engineers evaluate the device alongside alternative instrumentation-amplifier implementations.
ドロップイン代替品: INA2141P — 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。
INA2141PA
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA2141P 最大定格＆電気的特性
| Product Type | Dual instrumentation amplifier |
| Number of Amplifiers | 2 circuits |
| Gain Settings | 10 and 100 |
| Supply Voltage Range | ±2.25 V to ±18 V |
| Maximum Input Protection | ±40 V |
| Offset Voltage | 50 µV maximum |
| Offset Voltage Drift | 0.5 µV/°C maximum |
| Gain Accuracy | ±0.05% maximum |
| Input Bias Current | 5 nA maximum |
| Common-Mode Rejection Ratio | 117 dB minimum at G = 100 |
| Bandwidth | 200 kHz at G = 100 |
| 静止電流 | 750 µA per amplifier |
| Input Architecture | Current-feedback input circuitry |
| Internal Gain Configuration | Laser-trimmed |
| パッケージ | 16-pin plastic DIP (PDIP) |
| 実装タイプ | Through-hole |
INA2141P 16-pin plastic dip (pdip) ピン配置ガイド
INA2141P (16-pin plastic dip (pdip) 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: INA2141P.
詳細は データシート をご参照ください。
主な用途
INA2141P の用途: 6 件s: Bridge Sensor Signal Conditioning, Industrial Process Measurement, Medical Monitoring Front End, Battery-Powered Portable Instrument, Current and Voltage Loop Sensing, Laboratory and Test Equipment.
Bridge Sensor Signal Conditioning
The INA2141P fits strain-gauge, pressure-transducer, and resistive bridge interfaces because each channel provides a gain of 10 or 100, offset voltage of 50 µV maximum, and offset drift of 0.5 µV/°C maximum. Place the bridge excitation across the amplifier input network and use the amplifier output for excitation-level error rejection and low-level differential-signal amplification. The dual configuration also allows a second channel to monitor a reference bridge or temperature signal. Verify the common-mode range at the selected gain, because bridge excitation can move the input voltage close to the supply rails.
おすすめ
Industrial Process Measurement
The INA2141P supports low-level process signals when the source is differential and common-mode noise must be rejected. Its 117 dB minimum CMRR at G = 100 helps suppress shared interference on paired sensor wires, while the current-feedback input stage preserves 200 kHz bandwidth at the higher gain. Use the two internal amplifiers for redundant sensing or for measuring a differential signal plus a complementary channel. In industrial cabinets, check the actual common-mode voltage and keep input protection needs separate from signal-bandwidth requirements.
おすすめ
Medical Monitoring Front End
The INA2141P can condition low-amplitude differential sensor signals in medical monitoring equipment where offset and common-mode rejection are important. A gain of 10 suits relatively large physiological signals, while gain 100 provides additional amplification for smaller transducers with a suitable common-mode range. The dual-channel architecture can process two sensing inputs without using separate amplifier packages. Medical designs still require application-specific safety analysis, input limiting, isolation strategy, and compliance review; the amplifier's specified input protection should not be treated as complete patient protection.
おすすめ
Battery-Powered Portable Instrument
The INA2141P is appropriate for portable, battery-powered instrumentation because the manufacturer specifies approximately 750 µA of quiescent current per amplifier and operation from ±2.25 V supplies. Its two amplifiers can handle two channels in one through-hole package, reducing component count where acceptable. The 50 µV maximum offset also limits the error introduced into small sensor outputs at low signal levels. For a compact battery design, verify whether a surface-mount orderable variant or a lower-power instrumentation amplifier is required after accounting for board-area constraints.
おすすめ
Current and Voltage Loop Sensing
The INA2141P can amplify the small differential voltage developed across a current-sense element when the common-mode voltage remains within the device's allowed range. Gain 100 increases the measurement resolution for low-value shunt drops, and the 117 dB minimum CMRR at that gain helps reject noise common to both shunt terminals. The input-protection capability reaches ±40 V, but it should not be relied upon as the primary surge-protection element. Carefully analyze headroom, shunt placement, Kelvin routing, and the amplifier's output-swing limits.
おすすめ
Laboratory and Test Equipment
The INA2141P is useful in laboratory front ends that measure weak differential outputs while rejecting shared noise on test fixtures. Its two gain settings allow the same circuit architecture to cover both moderate and small signals, and laser trimming supports repeatability across channels. The 200 kHz bandwidth at G = 100 permits measurement of signals beyond static DC only, so higher-frequency applications still require attention to settling time and gain-bandwidth behavior. A 16-pin plastic DIP package also simplifies prototyping and socketed laboratory assemblies.
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: INA2141P — 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 | INA2141PA |
|---|---|---|
| Package | 16-PDIP | 16-PDIP (candidate; verify manufacturer ordering table) |
| Brand | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Dual instrumentation amplifier | Dual instrumentation amplifier |
| Gain Settings | 10 and 100 | 10 and 100 |
主な差別化要因
- Two precision channels in one through-hole package （vs INA2141PA)
- Low offset supports small-signal measurement （vs INA2141PA)
- High common-mode rejection at the higher gain （vs INA2141PA)
設計ノート
The verified operating range begins at ±2.25 V, so power-supply headroom must be checked before assuming that either fixed gain can be used with a low-voltage sensor. Place the supply bypass capacitors close to the positive and negative pins and keep return-current paths away from sensitive input traces. The datasheet specifies approximately 750 µA of quiescent current per amplifier, but total supply current also depends on output current, load impedance, and the application reference network.
Route the differential inputs as a closely coupled pair and avoid routing them parallel to switching-node edges or the high-current return path of the system. Gain accuracy and CMRR can be degraded by unequal input impedance, leakage, and unmatched traces even when the amplifier itself is accurate. Keep the gain-setting and reference components close to their associated pins where the manufacturer layout permits, and provide a quiet ground reference for the analog return current.
Do not treat the ±40 V input-protection rating as a substitute for external surge protection. Verify the absolute maximum input voltage under the actual fault condition, account for input clamp current, and add series resistance or dedicated clamps where needed. Also confirm that the signal's common-mode voltage remains valid at the selected gain of 10 or 100; a low offset specification cannot compensate for an input operating outside the linear common-mode range.
The current-feedback architecture maintains 200 kHz bandwidth at G = 100, but practical settling performance still depends on source impedance, feedback-network implementation, output loading, and the complete signal path. Do not infer small-signal bandwidth as the usable settling frequency for a step response. Validate the full gain-and-filter network with the selected sensor source impedance and include the amplifier's offset and drift in the end-to-end error budget.
コンプライアンス情報
The supplied manufacturer and distributor snippets do not explicitly state RoHS, REACH, halogen-free, lead-free, conflict-minerals, or automotive qualification information. AEC-Q100 is treated as not applicable because no automotive qualification is stated for this orderable variant.
