Texas Instruments INA351ABSIDSGR

Overview

INA351ABSIDSGR from Texas Instruments is a selectable-gain instrumentation amplifier with integrated reference buffer, designed for bridge sensing and differential-to-single-ended conversion. It offers G = 10 or G = 20 gain options, 95 dB typical CMRR, 0.2 mV typical offset voltage, 100 kHz bandwidth at G = 10, and operates from 1.8 V to 5.5 V supply. It targets low-power, space-constrained applications such as weigh scales and wearable health monitors.

For engineers reviewing the INA351ABSIDSGR datasheet, INA351ABSIDSGR pinout, INA351ABSIDSGR application, or INA351ABSIDSGR equivalent, key selection criteria include gain select logic behavior, shutdown current (≤1.5 µA), output drive capability into 500 pF, quiescent current (110 µA typical), and compatibility with 10-bit to 14-bit ADCs in battery-powered systems.

Technical Context

The INA351ABSIDSGR implements a three-amplifier instrumentation architecture with precision-matched on-die resistors, eliminating external gain-setting components. Its gain-select (GS) pin toggles between G = 10 (logic low) and G = 20 (logic high), while the integrated reference buffer provides a stable, unity-gain buffered REF output referenced to VS/2.

It features rail-to-rail input common-mode range (V– to V+), 86 dB minimum DC CMRR across all gains, and optimized stability driving capacitive loads up to 500 pF with <20% overshoot - critical for direct connection to ADC input networks without external isolation.

Key Specifications

Pinout & Package

INA351ABSIDSGR uses the 8-pin WSON (DSG) package: 2 mm × 2 mm body, exposed thermal pad connected to V–, 0.5 mm pitch. Pin 1 is GS (gain select), Pin 2 is IN–, Pin 3 is IN+, Pin 4 is V–, Pin 5 is NC, Pin 6 is REF, Pin 7 is OUT, Pin 8 is V+.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with INA333AIDGKR and AD8420ARMZ, the INA351ABSIDSGR uniquely combines dual-gain selectability, integrated REF buffer, and ultra-low IQ in a 2 mm × 2 mm WSON package - making it optimal for compact, battery-powered, multi-sensor systems requiring flexible front-end configuration.

Availability

INA351ABSIDSGR is available at Aetrix Electronics and suitable for weigh scale design, wearable health monitoring, industrial analog input modules, and bridge-based pressure transmitter development requiring stable component supply and long-term manufacturability.

Supply support for INA351ABSIDSGR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA351 product line delivers cost- and size-optimized instrumentation amplifiers with integrated reference buffers for low-power, high-accuracy sensor signal conditioning in space-constrained applications.

FAQ

What gain options does the INA351ABSIDSGR support, and how are they selected?

The INA351ABSIDSGR supports two gain options: G = 10 (when GS pin is logic low) and G = 20 (when GS pin is logic high). An unconnected GS pin defaults to G = 20. This selection is implemented via internal laser-trimmed resistor networks, ensuring 0.015% typical gain error at G = 10 and 0.020% at G = 20. The INA351ABSIDSGR does not support other gain values.

Does the INA351ABSIDSGR require external resistors to set gain?

No, the INA351ABSIDSGR does not require external resistors to set gain. It integrates precision-matched thin-film resistors on-die for both gain options (G = 10 and G = 20), eliminating external components, reducing PCB area, and avoiding resistor matching errors. This integration is confirmed in the device description and electrical characteristics tables of the INA351ABSIDSGR datasheet.

What is the function of the REF pin on the INA351ABSIDSGR?

REF pin on the INA351ABSIDSGR is an output that provides a buffered, unity-gain copy of the internal reference voltage (typically VS/2). It delivers low-impedance drive (100 GΩ || 5 pF input Z, 0.015% gain error), enabling direct use as an ADC reference or level-shift anchor. Unlike many instrumentation amplifiers, the INA351ABSIDSGR integrates this buffer - no external op-amp or divider is needed.

Can the INA351ABSIDSGR operate from a single 1.8 V supply?

Yes, the INA351ABSIDSGR is fully specified for operation from a single 1.8 V supply (±0.9 V dual-supply equivalent). At 1.8 V, it maintains 110 µA typical quiescent current, 95 dB CMRR, and rail-to-rail input common-mode range (V– to V+). Output swing is limited to within 15 mV of each rail, and bandwidth reduces to ~60 kHz at G = 10 - verified in the recommended operating conditions and electrical characteristics sections of the INA351ABSIDSGR datasheet.

How does the shutdown feature work on the INA351ABSIDSGR?

The SHDN pin (Pin 8 on DSG package) enables hardware-controlled shutdown: logic high enables the amplifier, logic low disables it, and an open connection defaults to enabled. In shutdown, quiescent current drops to 0.85 µA typical (IQSD), and output enters high-impedance state. Enable/disable times are 100 µs and 5 µs respectively - measured from 50% SHDN transition to 90%/10% output settling - as specified in the INA351ABSIDSGR electrical characteristics table.