INA101CM - 25uV Instrumentation Amplifier | Texas Instruments
料号： INA101CM ✓ 量产中INA101CM 概述
An instrumentation amplifier is a specialized analog amplifier optimized for measuring small signals embedded in larger common-mode voltages. It typically combines three precision operational amplifiers with laser-trimmed metal-film resistors to provide high differential input impedance, accurate gain, and strong rejection of common-mode interference. Within the analog IC hierarchy, an instrumentation amplifier is a precision amplifier used for sensor conditioning, data acquisition, and industrial measurement systems.
The INA101CM combines three precision operational amplifiers and laser-trimmed metal-film resistors on one monolithic integrated circuit. Its maximum input offset voltage is 25 uV, while maximum input drift is 0.25 uV/°C. Low nonlinearity of 0.002% supports predictable signal transfer, and the 13 nV/√Hz noise specification makes the amplifier suitable for low-level bridge, thermocouple, and resistance-temperature-detector signals.
A common-mode rejection ratio of 106 dB at 60 Hz helps suppress mains-related interference and other signals shared equally by both inputs. The differential input resistance is approximately 10 GΩ, reducing loading on high-impedance sources. The listed operating supply range is ±5 V to ±20 V, and the typical slew rate is 0.4 V/µs. Listed bandwidth figures range from 25 kHz to 300 kHz across source descriptions, so the manufacturer datasheet should be consulted for gain-specific bandwidth limits.
Typical uses include strain-gauge bridge conditioning, thermocouple and RTD signal acquisition, industrial process measurement, medical instrumentation, and remote sensor interfaces. The device is particularly useful when a millivolt-level differential signal must be amplified while rejecting substantial common-mode voltage present in industrial wiring environments.
When designing around the INA101CM, verify the gain-set resistor values against the manufacturer gain equation and check bandwidth at the selected gain. Keep input and reference-pin traces short, use a low-noise reference when gain adjustment is required, and provide stable bypass capacitance close to the supply pins. The 10-pin TO-100 package also requires adequate lead clearance and appropriate thermal consideration at elevated ambient temperatures.
This product page combines the manufacturer electrical characteristics, package information, replacement guidance, application fit, and design considerations to support faster engineering evaluation. The INA101CM datasheet remains the controlling document for pin assignments, gain curves, absolute maximum ratings, and orderable option details.
直接替换替代料： INA101CM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
INA101CM1
✅ 直接替换📋 参考替代料（不在目录中）
INA101CM-BSS4
✅ 直接替换📋 参考替代料（不在目录中）
INA101CM 最大额定值与电气特性
| Product Type | Very-high-accuracy instrumentation amplifier |
| Number of Channels | 1 amplifier circuit |
| Maximum Input Offset Voltage | 25 uV |
| Maximum Input Offset Drift | 0.25 uV/°C |
| Maximum Nonlinearity | 0.002% |
| Input Noise | 13 nV/√Hz |
| Common-Mode Rejection Ratio | 106 dB at 60 Hz |
| Differential Input Resistance | Approximately 10 GOhm |
| Supply Voltage Range | ±5 V to ±20 V |
| Typical Slew Rate | 0.4 V/µs |
| Listed Gain-Bandwidth Product | 25 kHz |
| Listed Bandwidth | 300 kHz |
| Maximum Power Dissipation | 600 mW |
| Integrated Amplifier Count | 3 precision operational amplifiers |
| Internal Resistance Type | Laser-trimmed metal-film resistors |
| 封装 | 10-pin TO-100 |
| 安装类型 | Through-hole |
| Supported Package Family | 14-pin plastic DIP, 16-pin ceramic DIP, and TO-100 family options |
INA101CM 14-pin plastic dip, 16-pin ceramic dip, and to-100 family options 引脚配置指南
INA101CM（14-pin plastic dip, 16-pin ceramic dip, and to-100 family options 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： INA101CM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
INA101CM 适用于 6 应用s: Strain-Gauge Bridge Conditioning, Thermocouple Measurement, RTD Sensor Interface, Remote Sensor Data Acquisition, Medical Instrumentation, Precision Laboratory Instrumentation.
Strain-Gauge Bridge Conditioning
The INA101CM fits strain-gauge bridge front ends that produce millivolt-level differential signals while the bridge common-mode voltage remains much larger. Its 25 uV maximum offset, 0.25 uV/°C maximum drift, and 106 dB common-mode rejection at 60 Hz help reduce gain error and interference from the excitation environment. Place the amplifier close to the bridge and use short, shielded differential traces to minimize pickup. The 10-pin TO-100 package requires adequate board spacing, while the ±5 V to ±20 V supply range supports common laboratory and industrial bridge excitations with appropriate headroom.
推荐
Thermocouple Measurement
The INA101CM is appropriate for low-level thermocouple acquisition because the 13 nV/√Hz input noise and 25 uV maximum offset reduce errors relative to small temperature-dependent voltages. Its 106 dB CMRR at 60 Hz is valuable when long thermocouple wires pick up power-frequency interference. Use a cold-junction compensation reference, input filtering with the correct differential resistance, and protection suitable for the measured voltage range. The ±5 V to ±20 V supply operation gives adequate output swing for many industrial thermocouple transmitters while preserving a conventional through-hole footprint.
推荐
RTD Sensor Interface
The INA101CM can amplify resistance-temperature-detector signals where excitation current creates a small differential voltage across the sensor. Low offset drift of 0.25 uV/°C helps maintain accuracy as ambient temperature changes, while approximately 10 GOhm differential input resistance limits source loading. Choose a precision excitation source and ratio-reference the measurement when greater stability is required. Keep the amplifier inputs away from switching nodes and use guarded traces to reduce leakage and thermoelectric errors in precision installations.
推荐
Remote Sensor Data Acquisition
The INA101CM is useful in remote-sensor front ends where long cable runs expose the measurement to substantial common-mode noise. Its 106 dB common-mode rejection at 60 Hz attenuates shared interference, while the 10 GOhm input resistance reduces loading from high-impedance sensors. The device can amplify low-level signals before an ADC or transmitter stage, reducing the need to recover those signals digitally after substantial cable corruption. Add input protection, filtering, and a solid analog ground reference based on the installation's surge and grounding requirements.
推荐
Medical Instrumentation
The INA101CM supports precision bioinstrumentation and laboratory measurement circuits that operate with small differential signals superimposed on larger common-mode voltages. Its 13 nV/√Hz noise, 25 uV maximum offset, and 0.002% maximum nonlinearity improve signal fidelity before digitization. Medical equipment designs must add the required patient protection, isolation, leakage-current control, and safety verification at the system level. The TO-100 package is useful where a through-hole, inspectable layout is preferred and the board area permits a 10-pin metal-package footprint.
推荐
Precision Laboratory Instrumentation
The INA101CM fits laboratory instruments that amplify small differential signals while rejecting common-mode noise from oscillators, transducers, or long test leads. Its 25 uV offset limit and 0.25 uV/°C drift support stable measurements over changing bench temperatures, and the 106 dB CMRR at 60 Hz improves rejection of mains-related pickup. The conventional 10-pin TO-100 package simplifies construction of modular analog front-end boards. Select the external gain resistor and bypass capacitors according to the Texas Instruments INA101 datasheet, and validate noise and settling performance for the intended measurement bandwidth.
推荐
推荐产品汇总
工程参考数据： INA101CM ——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 | INA101CM1 | INA101CM-BSS4 |
|---|---|---|---|
| Package | TO-100-10 | TO-100-10 | TO-100-10 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Instrumentation amplifier | Instrumentation amplifier | Instrumentation amplifier |
关键差异点
- Low offset and drift suit precision sensor measurements （对比 INA101CM-BSS4)
- High rejection of 60 Hz common-mode interference （对比 INA101CM1)
- Legacy-compatible through-hole footprint （对比 INA101CM1)
设计说明
Keep the INA101 input, reference, and gain-resistor connections short and away from clocks, relays, and high-current switching paths. Place input filtering capacitors at the connector or sensor side when they are required for EMI control, and use symmetric input routing to minimize conversion of common-mode interference into differential error. The approximately 10 GOhm input resistance reduces sensor loading but does not eliminate leakage caused by contaminated boards or conformal coating.
Design the supply rails so every pin remains within the manufacturer's absolute maximum limits under startup, shutdown, and fault conditions. Although the listed operating range is ±5 V to ±20 V, the usable input and output range is narrower. Place stable bypass capacitors close to the supply pins, provide adequate energy storage for transient loads, and account for the ±20 V maximum condition when selecting protection and isolation components.
Calculate INA101CM dissipation from the actual output voltage, load current, and supply configuration rather than using the 600 mW published maximum as an operating target. For a resistive load, estimated dissipation is the quiescent power plus the voltage dropped across the amplifier multiplied by load current. Use that estimate with the manufacturer thermal information and the PCB copper area to confirm that junction temperature remains below its allowed limit.
Gain accuracy depends on the external gain-setting resistor and the accuracy of the reference arrangement. Use the manufacturer gain equation to select the resistor network, avoid unnecessarily high gain when bandwidth is insufficient, and verify settling behavior for the selected gain. When using the reference input, keep it low impedance and bypass it close to the device to prevent injected noise from increasing output error.
Do not treat all INA101 package options as interchangeable: the family includes plastic and ceramic DIP variants as well as TO-100 packages. Confirm the exact INA101CM orderable suffix, lead numbering, temperature grade, and pin functions before changing an existing design. Also check whether the source material's bandwidth description applies to a different gain condition rather than comparing a broad family figure directly with a required small-signal bandwidth.
合规信息
Use the manufacturer product page and datasheet for current environmental, material, and automotive qualification statements.
