INA111BU

Overview

The INA111BU is a high-speed, FET-input instrumentation amplifier from Texas Instruments. It utilizes a current-feedback topology to deliver excellent performance with a slew rate of 17 V/µs and a 3dB bandwidth of 470 kHz. Key electrical specifications include a common-mode rejection ratio (CMRR) of 106 dB, an input bias current of 50 pA, and an input offset voltage of 250 µV. The device operates on a single supply voltage ranging from 12 V to 36 V, consuming 3 mA of quiescent current. It features a gain error of 0.01% and provides an output current capability of 25 mA per channel. The component is housed in a 16-SOIC package.

Feature Summary

• High-speed operation enabled by current-feedback topology for fast signal processing
• FET-input stage providing very low input bias current for minimal loading effects
• High accuracy with low gain error and high common-mode rejection ratio
• Single-supply compatibility supporting wide voltage ranges

Applications

• Medical instrumentation systems
• Test and measurement equipment
• Industrial automation control circuits

Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to ensure authenticity. Confirm that the 16-SOIC package matches your PCB footprint requirements. Check RoHS compliance status if environmental regulations apply to your manufacturing process. Ensure the operating temperature range meets your system's thermal design constraints before finalizing procurement.

Selection Notes

Select this component when high-speed signal amplification is required alongside low input bias current characteristics. The current-feedback architecture makes it suitable for applications demanding rapid settling times. Consider the 16-SOIC package size for space-constrained designs. Evaluate the single-supply operation capability if dual power rails are unavailable in the target system environment.

Part Context

The INA111BU belongs to the INA11x series of instrumentation amplifiers designed for precision applications. This series emphasizes speed and accuracy, distinguishing itself from standard op-amp based solutions. The BU suffix indicates the specific surface-mount packaging variant within the broader INA111 product family offered by Texas Instruments.

Replacement Considerations

Consult official Texas Instruments substitution guides for verified alternatives. Generic instrumentation amplifiers may not match the specific current-feedback performance or FET-input characteristics of the INA111BU.