Texas Instruments INA351ABSIRUGR

Overview

INA351ABSIRUGR from Texas Instruments is a selectable-gain instrumentation amplifier with integrated reference buffer, designed for bridge sensing and differential-to-single-ended conversion in space- and power-constrained systems. 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-speed 10-bit to 14-bit ADC interfacing in portable medical and industrial sensors.

For engineers reviewing the INA351ABSIRUGR datasheet, INA351ABSIRUGR pinout, INA351ABSIRUGR application, or INA351ABSIRUGR equivalent, key selection criteria include gain select logic compatibility, ultra-low quiescent current (110 µA typ), RUG package thermal performance (RθJB = 99.6 °C/W), and integrated reference buffer functionality for single-supply operation.

Technical Context

The INA351ABSIRUGR implements a three-amplifier instrumentation architecture with precision-matched on-die resistors to eliminate 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 reference output (REF pin) for level-shifting applications.

It features rail-to-rail input common-mode range (V– to V+), 500 pF capacitive load drive capability with <20% overshoot, and shutdown mode reducing quiescent current to 0.85 µA. Performance is specified across –40°C to +125°C, supporting industrial and automotive-grade deployments without derating.

Key Specifications

Pinout & Package

The INA351ABSIRUGR is housed in a 10-pin X2QFN (RUG) package measuring 1.5 mm × 2.0 mm (3 mm²), with exposed thermal pad connected to V– for enhanced thermal dissipation (RθJB = 99.6 °C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA350ABSIRUGR and AD8420ARMZ, the INA351ABSIRUGR uniquely balances programmable gain, ultra-low power, miniature packaging, and integrated reference buffering-making it optimal for cost-sensitive, space-constrained, battery-operated sensor nodes requiring flexible gain configuration without external components.

Availability

INA351ABSIRUGR is available at Aetrix Electronics and suitable for bridge sensing, analog input modules, and wearable health monitoring requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for INA351ABSIRUGR 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.

The INA351 product line delivers cost- and size-optimized instrumentation amplifiers for low-power, high-accuracy sensor signal conditioning in portable and industrial applications-designed to replace discrete op-amp + resistor solutions.

FAQ

What is the function of the REF pin on the INA351ABSIRUGR?

The REF pin on the INA351ABSIRUGR provides a buffered, unity-gain output of the internal reference voltage (typically V_S/2). It serves as a stable, low-impedance reference for ADCs or level-shifting circuits, eliminating the need for an external op-amp buffer. This feature simplifies single-supply designs and improves system accuracy in INA351ABSIRUGR-based sensor interfaces.

Can the INA351ABSIRUGR operate from a 1.8 V single supply?

Yes, the INA351ABSIRUGR is fully specified for 1.8 V to 5.5 V single-supply operation (or ±0.9 V to ±2.75 V dual-supply). At 1.8 V, it maintains 95 dB typical CMRR, 110 µA typical quiescent current, and rail-to-rail input common-mode range-enabling direct integration with low-voltage microcontrollers and energy-harvesting systems using the INA351ABSIRUGR.

How does gain selection work on the INA351ABSIRUGR?

Gain selection on the INA351ABSIRUGR is controlled by the GS pin: logic low selects G = 10, logic high selects G = 20. No connection defaults to G = 20. The GS pin accepts standard CMOS logic levels referenced to V–, with V_IL ≤ (V–) + 0.2 V and V_IH ≥ (V–) + 1 V. This hardware-selectable gain eliminates firmware overhead and supports static configuration in INA351ABSIRUGR-based systems.

What is the maximum capacitive load the INA351ABSIRUGR can drive?

The INA351ABSIRUGR drives up to 500 pF with less than 20% overshoot under typical conditions (G = 10, V_S = 5.5 V). For heavier loads, a series isolation resistor (e.g., 50 Ω) is recommended to maintain stability. This capability allows direct connection to ADC input capacitors or long PCB traces without external buffering-critical for minimizing component count in INA351ABSIRUGR implementations.

Does the INA351ABSIRUGR require external gain-setting resistors?

No, the INA351ABSIRUGR integrates precision-matched thin-film resistors for both gain and reference buffering, eliminating all external gain-setting components. This reduces BOM cost, PCB area, and assembly complexity versus discrete instrumentation amplifier designs-delivering verified performance and guaranteed matching without calibration, as confirmed in the INA351ABSIRUGR datasheet.