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INA129U Information
INA129U by Texas Instruments is an Instrumentation Amplifier.
Instrumentation Amplifiers are under the broader part category of Amplifier Circuits.
Amplifier circuits use external power to increase the amplitude of an input signal. They can be used to perform linear amplifications or logarithmic functions. Read more about Amplifier Circuits on our Amplifier Circuits part category page.
Calculations from this tool are estimations only for imports into the United States. Please refer to the distributor or manufacturer and reference official US government sources and authorities to verify any final purchase costs.
This table gives cross-reference parts and alternative options found for INA129U. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of INA129U, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.
The maximum voltage that can be applied to the input pins is ±40V, but it's recommended to keep it within ±20V for optimal performance.
The gain of the INA129U is calculated by the ratio of the output voltage to the input voltage. The gain can be set by the external resistors Rg and Rf, according to the formula: Gain = (Rf / Rg) + 1.
The REF pin is used to set the output voltage reference point. It can be connected to a voltage reference or a fixed voltage source to set the output voltage range.
To reduce noise and oscillations, use a low-pass filter at the input, keep the input and output traces short and away from noise sources, and use a bypass capacitor at the power supply pins.
Yes, the INA129U can be used as a differential amplifier by connecting the inputs differentially and using the output as a single-ended signal.
