INA101AM - Very High Accuracy Instrumentation Amplifier | Texas Instruments
MPN: INA101AM ✓ ActiveINA101AM Overview
An instrumentation amplifier is a specialized differential amplifier optimized for measuring small differential signals that are superimposed on a much larger common-mode voltage. Its internal resistor network and matched amplifiers provide predictable gain, high input impedance, and accurate rejection of common-mode interference. This makes the INA101AM suitable for sensor interfaces, strain gauges, thermocouples, RTDs, bridge transducers, and general instrumentation systems where signal integrity and measurement stability are important.
The INA101AM datasheet highlights very low drift of 0.25 mV/°C maximum, low offset voltage of 25 mV maximum as identified in the verified distributor result, low nonlinearity of 0.002%, low noise of 13 nV/√Hz, and high common-mode rejection of 106 dB at 60 Hz. The available technical reference also describes a bandwidth of approximately 300 kHz and a high input impedance of 10 GΩ. These specifications support precision amplification of low-level sensor signals while preserving fast transient response.
The monolithic three-op-amp architecture and laser-trimmed resistors reduce component count and simplify instrumentation-amplifier implementation. The INA101AM is intended for applications requiring accurate differential measurement, including industrial process control, test and measurement equipment, medical instrumentation, load-cell interfaces, and remote sensor acquisition. The TO-100-10 mechanical package supports through-hole assembly and provides a practical option for legacy and industrial equipment designs.
A key design consideration is ensuring that input common-mode voltage and supply voltage remain within the datasheet limits. The gain-setting resistor and external input and feedback components should be selected with suitable tolerance and stability. Input filtering, guarding, grounding, and keeping sensor wiring away from high-current conductors can further improve repeatability and rejection of unwanted interference.
This product page consolidates the verified Texas Instruments, DigiKey, Mouser, and distributor information with practical application guidance, package details, and engineering-oriented selection information for engineers evaluating the INA101AM.
Drop-in alternatives for INA101AM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with INA101AM (same form factor and footprint) — differing in Package, Mounting Type, Bandwidth, Input Impedance, Architecture.
INA101AG
✅ Drop-InContact for price
View Datasheet →INA101SM
✅ Drop-InContact for price
View Datasheet →INA101KU
✅ Drop-InContact for price
View Datasheet →INA101P
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
INA101U
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
INA101AM Maximum Ratings & Electrical Characteristics
| Product Type | Instrumentation Amplifier |
| Number of Channels | 1 channel |
| Architecture | Three precision operational amplifiers with laser-trimmed metal-film resistors |
| Input Type | Differential |
| Maximum Supply Voltage | ±20 V |
| Offset Voltage | 25 mV maximum |
| Input Drift | 0.25 mV/°C maximum |
| Nonlinearity | 0.002% |
| Noise Density | 13 nV/√Hz |
| Common-Mode Rejection Ratio | 106 dB at 60 Hz |
| Input Impedance | 10 GΩ |
| Bandwidth | Approximately 300 kHz |
| Package | TO-100-10 |
| Mounting Type | Through-hole |
| Application Areas | Strain gauges, thermocouples, RTDs, remote sensors, and general-purpose data acquisition |
INA101AM to-100-10 Pin Configuration Guide
Pin configuration for INA101AM (to-100-10 package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for INA101AM.
Refer to the datasheet for full pin configuration.
Typical Applications
INA101AM is suitable for 6 applications: Strain-Gauge Bridge Measurement, Thermocouple Signal Conditioning, RTD Temperature Measurement, Precision Data Acquisition, Medical and Diagnostic Instrumentation, Load-Cell and Force Measurement.
Strain-Gauge Bridge Measurement
The INA101AM fits strain-gauge front ends because its differential instrumentation-amplifier architecture rejects common-mode bridge excitation while presenting a verified 10 GΩ input impedance. Its 106 dB CMRR at 60 Hz and 13 nV/√Hz noise density help preserve the small millivolt-level changes produced by a resistive bridge. Place the device close to the bridge, use symmetric routing, and confirm the applicable gain equation and supply limits in the manufacturer datasheet before finalizing the resistor values.
Recommended
Thermocouple Signal Conditioning
INA101AM can condition the low-level differential output of a thermocouple while rejecting common-mode voltage present on industrial wiring. Its high input impedance limits sensor-loading error, and its verified 25 mV maximum offset and 0.25 mV/°C maximum drift are important considerations for temperature measurement. The circuit also needs cold-junction compensation, input protection, and carefully selected gain so that the usable thermocouple range is not saturated.
Recommended
RTD Temperature Measurement
The INA101AM is suitable for resistive temperature detector bridges because differential measurement reduces sensitivity to supply and ground disturbances encountered along remote sensor wiring. Its verified 106 dB common-mode rejection at 60 Hz supports stable operation in electrically noisy environments, while the approximately 300 kHz bandwidth provides ample response for typical thermal systems. Use a precision excitation source and calculate lead-wire compensation and self-heating before applying the available gain.
Recommended
Precision Data Acquisition
INA101AM provides a compact single-channel instrumentation front end for laboratory and industrial data-acquisition systems. Differential input handling, 10 GΩ input impedance, and 106 dB common-mode rejection are useful when the source is small and a substantial offset voltage exists between the two input nodes. The approximately 300 kHz bandwidth supports general-purpose acquisition rather than ultra-high-speed sensing, making system-level aliasing and reference accuracy central design considerations.
Recommended
Medical and Diagnostic Instrumentation
The INA101AM can amplify small differential physiological or diagnostic sensor signals where high input impedance and common-mode rejection improve measurement integrity. Its verified 13 nV/√Hz noise density and 0.002% nonlinearity make it relevant to high-resolution front ends, although actual signal-chain suitability depends on the sensor bandwidth, electrode impedance, and safety isolation architecture. A medical design should separately validate patient protection, isolation, leakage current, and applicable regulatory requirements.
Recommended
Load-Cell and Force Measurement
INA101AM is appropriate for load-cell bridges that generate small differential voltages under excitation. The high common-mode rejection reduces errors from supply variation and cable-coupled interference, while high input impedance avoids significant bridge-loading error. For practical force systems, verify excitation voltage, full-scale output, amplifier gain, and input common-mode range against the load-cell manufacturer's specifications. Keep high-current motor wiring separate from the bridge leads to prevent unwanted thermal offsets.
Recommended
Recommended Products Summary
Engineering reference data for INA101AM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | INA101AG | INA101SM | INA101KU | INA101P | INA101U |
|---|---|---|---|---|---|---|
| Package | TO-100-10 | 14-pin ceramic DIP | SOIC-16 | SOIC-16 | DIP-14 | SOIC-16 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Instrumentation Amplifier | Instrumentation Amplifier | Instrumentation Amplifier | Instrumentation Amplifier | Instrumentation Amplifier | Instrumentation Amplifier |
| Number of Channels | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel |
Key Differentiators
- Verified high common-mode rejection (vs INA101AG)
- High input impedance for low-level sensing (vs INA101SM)
- Low-noise instrumentation amplification (vs INA101KU)
Design Notes
Route the two differential inputs as a closely matched pair and keep them away from switching nodes, relay contacts, and high-current return paths. A grounded guard or shield can reduce capacitive pickup on long sensor cables. Check the complete Texas Instruments datasheet for the recommended input and gain-resistor layout before manufacturing, because the internal resistor network is sensitive to parasitic resistance and leakage.
Do not assume that a family member with the same INA101 designation is mechanically interchangeable. The verified INA101AM ordering uses TO-100-10, while INA101AG, INA101SM, INA101KU, INA101P, and INA101U use other package options identified in the comparison results. Confirm the physical dimensions, lead pitch, exposed connections, and complete electrical tables in each manufacturer datasheet before treating any candidate as a replacement.
Use clean, independently decoupled supply rails and follow the manufacturer's recommended bypass-capacitor arrangement. The INA101AM operates with bipolar supply voltages up to ±20 V according to the verified reference, but the usable input common-mode range must remain valid at the selected gain and supply voltage. Decoupling close to the device helps prevent supply ripple from converting into measurement error.
For sensor inputs below the millivolt range, input bias current, resistor leakage, thermoelectric effects, and connector contact resistance can be more important than the nominal 13 nV/√Hz noise density. Use low-leakage gain-setting resistors, stable low-noise references where applicable, and clean connector contacts. Evaluate drift and offset at the actual temperature range rather than relying only on the 25 mV and 0.25 mV/°C maximum ratings.
Compliance Information
The supplied verified web data contains technical specifications, manufacturer links, and distributor listings but does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than inferred.
