INA101SM - High Accuracy Instrumentation Amplifier | TI
料号： INA101SM ✗ 停产INA101SM 概述
An instrumentation amplifier is a specialized differential amplifier optimized for measuring small signals superimposed on a large common-mode voltage. Its internal gain-setting network and three-op-amp architecture provide high input impedance, controlled gain, and strong common-mode rejection. In the broader semiconductor hierarchy, an instrumentation amplifier is an analog signal-conditioning amplifier, a linear amplifier, and ultimately an integrated circuit used within data-acquisition and measurement systems. The INA101 is intended to preserve signal integrity from sensor excitation through differential amplification.
Key features include a 13 nV/√Hz noise density, 25 uV maximum offset voltage, 0.25 uV/°C maximum drift, and 0.002% low nonlinearity. Its integrated precision resistors reduce external gain-setting components and help establish repeatable performance between assemblies. The high input impedance prevents the amplifier from significantly loading the source, while common-mode rejection is important when the wanted differential signal is much smaller than the voltage shared by both input terminals.
The verified data describes the INA101 as a monolithic integrated circuit combining three precision op amps with laser-trimmed metal-film resistors. The design is suited to precision amplification of differential inputs rather than single-ended audio or general logic signals. Comparison information identifies a typical dual-supply condition of ±15 V, with an indicated minimum of ±5 V and maximum of ±20 V; maximum power dissipation is listed as 600 mW. These operating details must be checked against the complete manufacturer datasheet for design limits and test conditions.
Typical applications include strain-gauge bridge excitation and measurement, low-level sensor acquisition, biomedical instrumentation, and general-purpose differential data acquisition. In a bridge circuit, the small millivolt-level differential output can be amplified while the instrumentation amplifier rejects common-mode excitation and prevents source loading. In biomedical or industrial measurement systems, the combination of low offset, low drift, and high input impedance helps preserve measurements over time and across varying source impedances.
Designers should confirm the exact pin assignments, gain configuration, supply sequencing, common-mode range, and output-swing limits in the manufacturer datasheet before layout. Because this through-hole TO-100 device can dissipate up to 600 mW according to the verified comparison data, adequate PCB copper and thermal spacing should be provided. Input and reference-ground connections should be kept short, and the gain-setting method should follow the datasheet's recommended resistor topology.
This page combines verified manufacturer and distributor information, source traceability, application guidance, and a disciplined alternative assessment. The available cross-reference results did not establish five verified, pin-compatible drop-in parts in the same package, so no unsupported replacements are presented as drop-in equivalents.
直接替换替代料： INA101SM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA101SM （相同外形与封装尺寸） ——差异在于 Package, Product Type.
该产品暂无直接替换替代料。
请求替代料INA101SM 最大额定值与电气特性
| Product Type | Very high accuracy instrumentation amplifier |
| Number of Circuits | 1 circuit |
| Internal Architecture | 3 precision operational amplifiers with laser-trimmed metal-film resistors |
| Maximum Input Offset Voltage | 25 uV max |
| Maximum Input Drift | 0.25 uV/°C max |
| Low Nonlinearity | 0.002% |
| Input Noise Density | 13 nV/√Hz |
| High Common-Mode Rejection | Specified at 60 Hz |
| High Input Impedance | 10^10 ohm |
| Minimum Dual Supply Voltage | ±5 V |
| Typical Dual Supply Voltage | ±15 V |
| Maximum Dual Supply Voltage | ±20 V |
| Maximum Power Dissipation | 600 mW |
| 封装 | TO-100-10, through-hole |
| Process Technology | Monolithic integrated circuit |
| 安装类型 | Through-hole |
INA101SM to-100-10, through-hole 引脚配置指南
INA101SM（to-100-10, through-hole 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： INA101SM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA101SM 适用于 6 应用s: Strain-Gauge Bridge Measurement, Precision Sensor Signal Conditioning, Biomedical Instrumentation, General-Purpose Data Acquisition, Industrial Process Monitoring, Precision Low-Noise Analog Front End.
Strain-Gauge Bridge Measurement
The INA101SM fits strain-gauge bridge measurement because its 25 uV maximum offset voltage, 0.25 uV/°C maximum drift, and 13 nV/√Hz noise density help preserve the small differential signal produced by a resistive bridge. Its high input impedance also reduces loading of the bridge and sensor network. The device is placed between the bridge output and the next stage of the measurement chain, with gain and common-mode limits selected from the official datasheet. Practical accuracy depends on bridge excitation stability, source impedance matching, clean reference grounding, and keeping sensitive input routing short.
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Precision Sensor Signal Conditioning
The INA101SM is suitable for conditioning low-level differential outputs from precision sensors when measurement integrity is more important than compactness. Its verified high input impedance of 10^10 ohm limits source loading, while low offset and drift reduce errors that could dominate a slow or high-resolution measurement. The instrumentation amplifier sits at the sensor interface and amplifies the differential signal before conversion or processing. Designers should verify the allowable input common-mode range and output swing against the selected gain, because those operating limits were not included in the supplied excerpts.
推荐
Biomedical Instrumentation
The INA101SM can support biomedical instrumentation front ends where small physiological or diagnostic signals must be amplified without excessive input loading. Its 25 uV maximum offset, 0.25 uV/°C maximum drift, and 13 nV/√Hz noise density provide a useful accuracy baseline for low-level amplifier stages. In an ECG, bridge, or sensor interface, the INA101SM would amplify the differential input while rejecting common-mode voltage. Actual suitability for a medical product also depends on patient protection, isolation, leakage, regulatory validation, and application-specific safety requirements.
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General-Purpose Data Acquisition
The INA101SM is appropriate for general-purpose data acquisition systems that need accurate differential amplification rather than a single-ended amplifier. Its monolithic integration of three precision operational amplifiers and laser-trimmed metal-film resistors provides a consistent signal-conditioning core for multiplexed or dedicated analog channels. The device can sit close to the sensor or connector to minimize interference and reduce cable-induced errors. System designers should still implement suitable input filtering, reference grounding, supply decoupling, and gain selection based on the full manufacturer application guidance.
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Industrial Process Monitoring
The INA101SM is suitable for industrial process monitoring when the measured differential signal is small and rides on a substantial common-mode voltage. The specified high common-mode rejection at 60 Hz helps distinguish the wanted bridge or sensor output from shared industrial noise, while the high input impedance reduces interaction with field-mounted transducers. The amplifier can condition a low-level process signal ahead of an ADC or control input. Its ±5 V to ±20 V indicated dual-supply span should be reconciled with field power availability and grounded-versus-bipolar input architecture before deployment.
推荐
Precision Low-Noise Analog Front End
The INA101SM can serve as the precision gain stage in a low-noise analog front end when a 13 nV/√Hz input noise density and 25 uV maximum offset are useful starting points. Its high input impedance allows the source to remain lightly loaded, while the differential architecture is suited to signals that require common-mode rejection. The component should be placed near the source, with short inputs, a stable reference, and grounding arranged to prevent injected current from becoming differential error. Bandwidth, settling behavior, and gain-programming details must be obtained from the manufacturer datasheet.
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推荐产品汇总
工程参考数据： INA101SM ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | INA104SMQ |
|---|---|---|
| Product Type | Very high accuracy instrumentation amplifier | Instrumentation amplifier |
| Brand | Texas Instruments | Texas Instruments |
关键差异点
- Verified precision offset specification （对比 INA104SMQ)
- Low-drift monolithic implementation （对比 INA101HP)
- High-impedance differential input stage （对比 INA101CM)
设计说明
Place the INA101SM close to the sensor or bridge output and keep the two input traces short, symmetric, and away from switching nodes. The verified high input impedance of 10^10 ohm reduces DC loading, but it does not eliminate AC or capacitive loading. Use a continuous ground plane where practical, keep input returns away from high-current paths, and avoid adding unnecessary copper or test-point capacitance around sensitive inputs.
Use the official datasheet to confirm the required supply arrangement, gain-dependent common-mode limits, and output swing before connecting the device. The supplied comparison data indicates operation from ±5 V to ±20 V with ±15 V typical. Decouple supply pins close to the component using the manufacturer-recommended network, and ensure that input common-mode voltage and output voltage remain within limits for the selected gain rather than relying only on the absolute supply ratings.
The verified comparison information lists maximum power dissipation as 600 mW. At elevated ambient temperature, provide copper area around the TO-100-10 package and avoid placing heat sources directly beneath it. Confirm the official maximum junction and case temperatures before calculating copper requirements. Because the exact thermal resistance depends on the PCB and manufacturer test conditions, use the datasheet value rather than an assumed thermal model.
Do not infer pin functions, gain equations, or the relation between INA101SM and INA101CM from their similar names. The verified excerpts identify INA101SM as TO-100-10 while INA101CM uses a different ordering suffix, so a footprint-compatible replacement has not been established. Similarly, INA104SMQ is only a related comparison candidate until its pinout, gain network, supply limits, and accuracy parameters are verified from its datasheet.
合规信息
The supplied verified web data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for INA101SM. These fields remain unknown rather than being inferred from the package or manufacturer.
