INA351ABSIRUGR

Instrumentation, Op Amps, Buffer Amps Overview

The INA351ABSIRUGR is a selectable-gain instrumentation amplifier from Texas Instruments, housed in a 10-pin X2QFN package measuring 1.5 mm by 2 mm. It operates on a single supply voltage ranging from 1.8 V to 5.5 V or dual supplies of ±0.9 V to ±2.75 V. The device features integrated gain selection via the GS pin, offering gains of 10 V/V (logic low) and 20 V/V (logic high). Key electrical specifications include a typical input offset voltage of 200 µV, a quiescent current of 110 µA, and a minimum common-mode rejection ratio of 86 dB at 5.5 V. The bandwidth is 100 kHz at G=10 and 50 kHz at G=20.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Selectable gain options of 10 V/V or 20 V/V configured via the Gain Select (GS) pin logic state.
• Integrated reference buffer amplifier operating in a unity gain follower configuration for precise output referencing.
• Ultra-small 10-pin X2QFN package design optimized for space-constrained applications.
• Shutdown capability allows power reduction when the device is idle.

Instrumentation, Op Amps, Buffer Amps Applications

• Bridge network sensing
• Differential to single-ended conversion
• Weigh scale systems
• Analog input modules

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix IRUGR corresponds to the X2QFN-10 package and tape-and-reel shipping format. Confirm that the ABS grade meets the required offset voltage and gain error tolerances for your application. Ensure the GS pin is properly terminated to select the desired gain level, as leaving it unconnected defaults to the higher gain setting.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when size and power efficiency are critical alongside moderate precision requirements. The fixed internal resistors eliminate the need for external gain-setting components, reducing bill of materials costs. Verify that the 100 kHz bandwidth at G=10 is sufficient for the signal frequency. Consider the shutdown feature if battery life is a primary constraint.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the INA351 family of cost and size-optimized instrumentation amplifiers. Unlike the INA351CDS variant which offers gains of 30 and 50, the INA351ABS provides lower gain options of 10 and 20. It shares the same physical footprint and pinout with other package variants like DSG and DDF, facilitating design flexibility across different board space constraints.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

INA351CDSIRUGR: Offers different gain options (30/50) but identical package and pinout.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the gain selected on the INA351ABS?

Gain is selected via the GS pin. A logic low selects G=10, while a logic high or no connection selects G=20.

What is the function of the REF pin?

The REF pin connects to an internal unity gain buffer amplifier, allowing the user to set the output reference voltage directly.