The INA128 and INA129 (INA12x) are low-power, general-purpose instrumentation amplifiers that offer excellent accuracy. The versatile three op amp design and small size make these amplifiers an excellent choice for a wide range of applications. Current-feedback input circuitry provides wide bandwidth even at high gain (200kHz at G = 100).
A single external resistor sets any gain from 1 to 10,000. The INA128 provides an industry-standard gain equation with a 50kΩ resistor. The INA129 gain equation uses a 49.4kΩ resistor to allow for drop-in replacements of comparable devices.
The INA12x are available in plastic DIP and surface-mount packages, specified for the –40°C to +85°C temperature range. The INA128 is also available in a dual configuration, the INA2128.
The upgraded INA828 offers a lower input bias current (0.6nA, maximum) and lower noise (7nV/√Hz) at the same quiescent current. See the Device Comparison Table for a selection of precision instrumentation amplifiers from Texas Instruments.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | INA12x Precision, Low-Power Instrumentation Amplifiers datasheet (Rev. G) | PDF | HTML | Jan 16, 2026 |
| Application note | Importance of Input Bias Current Return Paths in Instrumentation Amplifier Apps | PDF | HTML | Jul 27, 2021 | |
| Application brief | Comprehensive Error Calculation for Instrumentation Amplifiers | Mar 26, 2019 | ||
| Application note | A Numerical Protection Relay Solution (Rev. A) | Jul 26, 2018 | ||
| E-book | The Signal e-book: A compendium of blog posts on op amp design topics | PDF | HTML | Mar 28, 2017 | |
| User guide | Instrumentation Amplifier With DC Rejection Design Guide | May 14, 2015 | ||
| Analog design Journal | Getting the most out of your instrumentation amplifier design | Oct 10, 2005 |
For additional terms or required resources, click any title below to view the detail page where available.
The universal INAEVM (Instrumentation Amplifier Evaluation Module) is available in two package options that simplify prototyping precision instrumentation amplifiers in either the SO-8 (D) package or the MSOP-8(DGK) package with the pinout shown. See the chart in the user guide (...)
The analog engineer’s calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting operational-amplifier (...)
This design is an ac coupled instrumentation amplifier. More specifically, the circuit amplifies ac differential input signals and rejects dc differential and common mode signals. The input is dc coupled, so it achieves effective ac coupling by shifting the instrumentation amplifier reference (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| PDIP (P) | 8 | Ultra Librarian |
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