Texas Instruments INA350ABSIRUGR

Overview

INA350ABSIRUGR from Texas Instruments is a selectable-gain instrumentation amplifier optimized for low-power, space-constrained bridge-sensing applications. It delivers G = 10 or G = 20 gain options, 95 dB typical CMRR, 0.2 mV typical offset voltage, and 100 µA typical quiescent current in a 1.5 mm × 2.0 mm X2QFN-10 package.

For engineers reviewing the INA350ABSIRUGR datasheet, INA350ABSIRUGR pinout, INA350ABSIRUGR application, or INA350ABSIRUGR equivalent, key selection criteria include gain select logic compatibility, shutdown timing (100 µs enable), ultra-low power operation down to 1.8 V, and performance validation across –40°C to 125°C for industrial and wearable sensor front-ends.

Technical Context

The INA350ABSIRUGR uses a three-amplifier architecture with precision-matched on-chip resistors to eliminate external gain-setting components. Its gain-select (GS) pin toggles between G = 10 (logic low) and G = 20 (logic high), with no-connect defaulting to G = 20.

It integrates a reference input (REF) with 60 kΩ input impedance and 1 V/V gain, supports rail-to-rail output swing within 15 mV of supply rails, and features electro-magnetic interference rejection ratio (EMIRR) of 96 dB at 1 GHz - critical for noisy industrial environments.

Key Specifications

Pinout & Package

INA350ABSIRUGR is housed in a 10-pin X2QFN (RUG) package measuring 1.5 mm × 2.0 mm with exposed thermal pad connected to V–. Pin 1 is GS (gain select input), Pin 2 is IN–, Pin 3 is IN+, Pin 4 is V–, Pin 5 and Pin 10 are NC, Pin 6 is REF, Pin 7 is OUT, Pin 8 is V+, Pin 9 is SHDN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA350ABSIDR and INA350CDSIRUGR, the INA350ABSIRUGR uniquely balances minimal area (3 mm²), lowest gain options (10/20), and ultra-low IQ - making it optimal for size- and power-constrained bridge-sensing nodes where moderate gain suffices.

Availability

INA350ABSIRUGR is available at Aetrix Electronics and suitable for bridge network sensing, wearable fitness monitors, blood glucose meters, and analog input modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for INA350ABSIRUGR 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 INA350 product line was designed specifically for cost-sensitive, space-constrained sensor signal conditioning - integrating precision resistors and selectable gain to replace discrete op-amp + resistor implementations in 10–14-bit data acquisition systems.

FAQ

What gain options does the INA350ABSIRUGR support, and how are they selected?

The INA350ABSIRUGR supports two fixed gain options: G = 10 and G = 20. Gain is selected via the GS pin: logic low (≤0.2 V above V–) selects G = 10, logic high (≥1 V above V–) selects G = 20, and no connection defaults to G = 20. This eliminates external resistors while maintaining predictable, factory-trimmed performance - a key feature of the INA350ABSIRUGR design.

Does the INA350ABSIRUGR require external resistors for gain setting?

No, the INA350ABSIRUGR does not require external resistors for gain setting. It integrates precision-matched thin-film resistors internally, enabling G = 10 or G = 20 operation solely through the GS pin state. This reduces bill-of-materials cost, PCB area, and assembly complexity - a core advantage confirmed in the INA350ABSIRUGR datasheet and functional description.

What is the operating temperature range of the INA350ABSIRUGR?

The INA350ABSIRUGR is specified for operation from –40°C to 125°C. This extended range is validated across all electrical parameters including offset voltage, CMRR, and gain error, making the INA350ABSIRUGR suitable for automotive cabin modules, industrial process sensors, and medical devices exposed to wide ambient conditions.

How does the REF pin function in the INA350ABSIRUGR?

The REF pin on the INA350ABSIRUGR sets the output common-mode voltage. It has 60 kΩ input impedance and unity gain (1 V/V), meaning the output swings symmetrically around the REF voltage. The INA350ABSIRUGR datasheet specifies that REF must be driven by a low-impedance source - such as a buffered DAC or resistor divider - to maintain accuracy and stability in the INA350ABSIRUGR signal chain.

What shutdown current does the INA350ABSIRUGR draw when disabled?

When the SHDN pin is pulled low, the INA350ABSIRUGR enters shutdown mode and draws 0.70 µA typical quiescent current (IQSD) at 25°C, rising to 1.25 µA maximum across –40°C to 125°C. This ultra-low shutdown current enables aggressive power cycling in battery-powered systems - a verified specification for the INA350ABSIRUGR in its Electrical Characteristics table.