INA111AU

Overview

The INA111AU is a high-speed FET-input instrumentation amplifier manufactured by Texas Instruments. It features a single channel with a 3dB bandwidth of 2 MHz and a slew rate of 17 V/us. The device offers a common-mode rejection ratio (CMRR) of 106 dB, an input bias current of 20 pA, and an input offset voltage of 500 uV. It operates on a power supply voltage ranging from 12 V to 36 V, with a typical operating supply current of 3.3 mA. The component supports operation between -40 C and +85 C and is available in SMD/SMT packaging.

Feature Summary

• High-speed FET-input architecture for precision signal conditioning
• Low input bias current and low input offset voltage characteristics
• High common-mode rejection ratio for noise immunity

Applications

• Precision measurement systems requiring high bandwidth
• Industrial process control signal conditioning
• Medical instrumentation front-ends

Procurement Notes

Verify the specific package type and tape/reel specifications against the official datasheet before procurement. Ensure that the operating temperature range aligns with your system requirements. Confirm RoHS compliance status as indicated in the manufacturer's documentation. Cross-reference the manufacturer part number with distributor listings to ensure authenticity and correct revision level.

Selection Notes

Select this component when high-speed performance combined with low input bias current is required. The wide supply voltage range allows flexibility in power design. Consider the 2 MHz bandwidth limitation for higher frequency applications. Evaluate the need for external gain setting resistors if not integrated internally. Compare against other instrumentation amplifiers if lower power consumption or different package options are prioritized over speed.

Part Context

The INA111AU belongs to the INA111 series of instrumentation amplifiers from Texas Instruments. This series is designed for applications demanding high accuracy and speed. The AU suffix typically denotes a specific package variant within the family. It serves as a fundamental building block for analog signal processing chains where common-mode noise rejection is critical.

Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the Texas Instruments portfolio. Verify electrical parameter compatibility, including bandwidth, CMRR, and supply voltage ranges, before substituting. No public confirmed substitute part numbers are listed in the provided data.