INA141P - Precision G=10/100 Low-Power Amplifier | Texas Instruments
MPN： INA141P ✗ 停產INA141P 概覽
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.
直接替換替代品，適用於 INA141P — 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： INA141P （相同外形與佔位） — 差異在於 Package, Operating Temperature, Architecture, Supply Range, Product Type.
INA141P
✅ 直接替換聯絡詢價
查看資料表 →INA141U
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →INA141
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
INA126
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
INA141P 最大額定值與電氣特性
| 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 |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 8-pin plastic DIP |
| Package Pin Count | 8 pins |
| 安裝類型 | Through-hole |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
INA141P 8 pins 腳位配置指南
INA141P（8 pins 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： INA141P.
請參閱 資料表 以查看完整腳位配置。
典型應用
INA141P 適用於 6 應用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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 INA141P — 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 | 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 |
主要差異化特點
- Low offset for precision differential measurements (對比INA126)
- Low thermal drift (對比INA128)
- High common-mode rejection (對比INA141U)
設計說明
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.
合規資訊
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.
