INA141P - Precision G=10/100 Low-Power Amplifier | Texas Instruments
部品番号: INA141P ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
INA141P 概要
An instrumentation amplifier is a differential-input analog IC that amplifies the voltage difference between two signals while rejecting signals common to both inputs. The INA141 uses a versatile three-op-amp architecture, placing it in the instrumentation-amplifier hierarchy within the broader amplifier and signal-conditioning categories. Its general-purpose design is suitable for industrial measurement, sensor interfaces, current sensing, and other circuits that require differential gain and accurate signal extraction.
Key features include a maximum offset voltage of 50 µV, maximum offset drift of 0.5 µV/°C, accurate gain settings of 10 and 100, and maximum input bias current of 5 nA. The input stage is protected against voltages up to ±40 V, while the wide ±18 V supply range supports higher-amplitude measurement systems. The current-feedback input circuitry maintains wide bandwidth at high gain, reaching 200 kHz at a gain of 100 V/V according to the manufacturer datasheet.
The INA141P is intended for precision analog front ends rather than high-speed signal processing. At gain 10 or 100, its differential amplification behavior helps reject common-mode interference from power systems, sensors, and long wiring. The low offset voltage and low thermal drift are especially useful when the amplified differential signal is small and system accuracy is determined by input-referred error rather than by the downstream converter resolution.
Typical applications include current-shunt measurement, bridge-sensor signal conditioning, differential pressure sensing, industrial instrumentation, and low-level analog measurement. In these systems, the INA141P can amplify the difference between two sensor nodes while rejecting shared supply or ground disturbances. The exact input common-mode range, output swing, bandwidth, noise, and supply-current values must be confirmed against the manufacturer datasheet for the complete operating envelope.
A key design consideration is to verify that the measured differential voltage, common-mode voltage, supply rails, and required output span remain within the device limits. Input protection helps manage overload conditions, but protection networks and external resistors should still be selected for the actual system. Decoupling capacitors should be placed close to the supply pins, and the source impedances should be balanced to preserve common-mode rejection and accuracy.
This page synthesizes the verified Texas Instruments product information, the manufacturer datasheet, distributor listings, and cross-reference search results. It emphasizes verified INA141P capabilities, practical instrumentation-amplifier usage, and the need to confirm unreported electrical details before final design release.
ドロップイン代替品: INA141P — 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。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: INA141P （同一形状・フットプリント） — 相違点: Package, Architecture, Supply Range, Minimum Common-Mode Rejection, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
INA141P
✅ ドロップイン✓ 在庫あり
価格はお問い合わせください
データシートを見る →INA141U
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$6.75 / 個
データシートを見る →INA141
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
INA126
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
INA128PA
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
価格はお問い合わせください
データシートを見る →INA141P 最大定格＆電気的特性
| Device Type | Precision, low-power instrumentation amplifier |
| Available Gain Settings | 10 and 100 V/V |
| Maximum Offset Voltage | 50 µV |
| Maximum Offset Drift | 0.5 µV/°C |
| Maximum Input Bias Current | 5 nA |
| Minimum Common-Mode Rejection | 117 dB |
| Input Protection | ±40 V |
| Supply Range | ±18 V |
| Architecture | Three-op-amp instrumentation-amplifier design |
| Bandwidth at Gain 100 | 200 kHz |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | 8-pin plastic DIP |
| Package Pin Count | 8 pins |
| 実装タイプ | Through-hole |
| RoHS ステータス | unknown |
| REACH Status | unknown |
INA141P 8 pins ピン配置ガイド
INA141P (8 pins 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: INA141P.
詳細は データシート をご参照ください。
主な用途
INA141P の用途: 6 件s: Precision Current-Shunt Measurement, Bridge-Sensor Signal Conditioning, Industrial Differential Voltage Acquisition, Low-Level Pressure Sensor Interface, Laboratory and Instrumentation Signal Conditioning, Battery-Powered Differential Sensing.
Precision Current-Shunt Measurement
The INA141P fits precision current-shunt measurement because it offers selectable gains of 10 and 100, maximum offset voltage of 50 µV, maximum drift of 0.5 µV/°C, and minimum CMR of 117 dB. The instrumentation amplifier measures the voltage difference across a shunt while rejecting common-mode voltage present on both shunt nodes. At gain 100, the verified bandwidth is 200 kHz, allowing the device to address moderate-speed current measurements. The shunt voltage, common-mode level, supply rails, and output swing must remain within the complete manufacturer operating limits. Kelvin-connected shunt traces and balanced input routing are recommended so that PCB resistance and mismatch do not become significant measurement errors.
おすすめ
Bridge-Sensor Signal Conditioning
The INA141P is suitable for low-level bridge-sensor signal conditioning because its low input-referred offset and drift help preserve accuracy while its differential architecture rejects common-mode excitation and ground-related disturbances. The verified gain settings of 10 and 100 allow the designer to select a useful amplification factor for a resistive bridge output. The instrumentation amplifier can sit near the bridge and drive an ADC or measurement front end, but the bridge excitation voltage, common-mode range, input bias current of 5 nA maximum, and output swing must be verified from the manufacturer datasheet. Balanced traces and stable reference grounding are essential.
おすすめ
Industrial Differential Voltage Acquisition
The INA141P supports industrial differential-voltage acquisition where a small difference between two larger signals must be measured accurately. Its verified minimum common-mode rejection of 117 dB helps separate the desired differential component from shared noise, while the three-op-amp architecture provides a straightforward instrumentation-amplifier function. The device can be used near an analog-to-digital converter or an analog measurement chain, provided the input common-mode voltage, supply rails, and output range are checked. Industrial systems should also account for temperature drift, source-impedance balance, protection-network leakage, and grounding. The manufacturer datasheet remains the controlling source for electrical limits and application examples.
おすすめ
Low-Level Pressure Sensor Interface
The INA141P can interface with low-level pressure sensors that produce a small differential output riding on a larger common-mode voltage. Its low offset voltage of 50 µV maximum and low drift of 0.5 µV/°C maximum help reduce errors relative to the sensor signal, while the verified gain choices of 10 and 100 provide useful scaling options. The device should be selected only after checking the sensor excitation, common-mode range, input bias current, supply voltage, and output swing. Place the amplifier close to the sensor, use guarded or balanced routing, and avoid adding leakage paths between the protected input nodes and the measurement reference.
おすすめ
Laboratory and Instrumentation Signal Conditioning
The INA141P is appropriate for laboratory and instrumentation signal conditioning when a low-level differential signal must be amplified before measurement or conversion. Its precision-focused specifications include 50 µV maximum offset, 0.5 µV/°C maximum drift, 5 nA maximum input bias current, and 117 dB minimum CMR. The 200 kHz bandwidth at gain 100 provides useful response for many general-purpose measurement paths, although the complete frequency-response curve must be checked for the required signal amplitude and gain. Use a stable reference, decouple the supply pins, and keep input traces short and symmetric. The part is an amplifier, not a complete anti-aliasing or conversion solution.
おすすめ
Battery-Powered Differential Sensing
The INA141P may be used in battery-powered differential-sensing systems where low quiescent power is important and the measured signal requires common-mode rejection. The verified source describes the INA141 as a low-power instrumentation amplifier, while the INA141P package is identified as an 8-pin plastic DIP. Before selecting it for a battery application, confirm the exact quiescent current, supply-voltage combination, input common-mode range, output swing, and shutdown behavior from the manufacturer datasheet. Low offset and low drift can improve measurement resolution, but they do not eliminate sensor noise, ADC quantization error, or thermal effects. Keep the analog path away from switching converters and provide local supply bypassing.
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: INA141P — 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 | INA141U | INA141 | INA126 | INA128 |
|---|---|---|---|---|---|
| Package | 8-pin plastic DIP | 8-pin plastic DIP - package match requires official verification | 8-pin SOIC - verified family listing, not DIP | 8-pin plastic DIP - candidate requires official verification | 8-pin plastic DIP - candidate requires official verification |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
主な差別化要因
- Low offset for precision differential measurements （vs INA126)
- Low thermal drift （vs INA128)
- High common-mode rejection （vs INA141U)
設計ノート
Use short, symmetric input traces and matched source impedances to preserve the INA141P differential measurement accuracy. The verified minimum CMR of 117 dB is a device specification under defined test conditions; PCB resistance, connector mismatch, unequal input impedance, and external leakage can materially degrade real-system rejection. Place input protection components close to the pins and avoid shared copper paths that allow input current to alter the differential measurement.
Place supply-decoupling capacitors close to the INA141P supply pins and provide a low-impedance ground reference for the analog signal path. The INA141P is identified as an 8-pin plastic DIP, so verify the physical footprint and pin numbering against the official manufacturer datasheet before fabrication. Keep the analog input traces away from switching-node copper and high-current return paths.
Do not select the gain or supply rails from the INA141 feature summary alone. Confirm the input common-mode range, output swing, operating voltage, quiescent current, and temperature limits from the manufacturer datasheet. Although the inputs are protected to ±40 V, protection capability does not remove the need to constrain external fault energy or verify that the operating point remains within the specified electrical envelope.
コンプライアンス情報
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was included in the supplied verified data. Obtain current manufacturer or authorized-distributor documentation before making a compliance claim.
