Texas Instruments INA351CDSIDSGR

Overview

INA351CDSIDSGR from Texas Instruments is a selectable-gain instrumentation amplifier with integrated reference buffer, offering G = 30 or G = 50 gain options via the GS pin, 95 dB typical CMRR, 0.2 mV typical offset voltage, 110 µA typical quiescent current, and operation from 1.8 V to 5.5 V supply. It targets low-power bridge sensing and differential-to-single-ended conversion in wearable health monitors and industrial analog input modules.

For engineers reviewing the INA351CDSIDSGR datasheet, INA351CDSIDSGR pinout, INA351CDSIDSGR application, or INA351CDSIDSGR equivalent, key selection criteria include gain select logic compatibility (G = 30/50), WSON-8 (DSG) package footprint, integrated reference buffer functionality, and performance trade-offs between bandwidth (25 kHz at G = 50) and gain error (±0.015% typ. at G = 50).

Technical Context

The INA351CDSIDSGR implements a three-amplifier instrumentation architecture with precision-matched on-die resistors for fixed gain selection, eliminating external resistor matching requirements. Its internal reference buffer operates as a unity-gain follower referenced to V_REF, enabling direct interfacing to ADC reference inputs.

Gain selection is controlled by the GS pin: logic low selects G = 30, logic high selects G = 50. The shutdown (SHDN) pin enables full amplifier disable with 0.85 µA max quiescent current, supporting battery-powered applications requiring intermittent sensing.

Key Specifications

Pinout & Package

INA351CDSIDSGR is packaged in an 8-pin WSON (DSG) package measuring 2 mm × 2 mm with exposed thermal pad connected to V−. Pin count and layout match industry-standard SOT-23-8 footprints for layout reuse.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA351ABSIDSGR and AD8237ARMZ, the INA351CDSIDSGR uniquely delivers selectable high gain (30/50), integrated reference buffering, and ultra-low power in a 2 mm × 2 mm WSON package-making it optimal for space-constrained, battery-powered precision measurement where gain flexibility and system integration reduce component count.

Availability

INA351CDSIDSGR is available at Aetrix Electronics and suitable for bridge sensing, wearable health monitoring, and industrial analog input modules requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for INA351CDSIDSGR 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 battery-powered and space-constrained applications, emphasizing integrated functionality, low power, and simplified system design.

FAQ

What gain options does the INA351CDSIDSGR support, and how are they selected?

The INA351CDSIDSGR supports two gain options: G = 30 and G = 50. These are selected using the GS pin (Pin 1): applying logic low (≤0.2 V relative to V−) selects G = 30, while logic high (≥1 V relative to V−) selects G = 50. If the GS pin is left unconnected, the device defaults to G = 50. This configuration eliminates the need for external gain-setting resistors and simplifies PCB layout for the INA351CDSIDSGR.

Does the INA351CDSIDSGR include an integrated reference buffer, and what is its function?

Yes, the INA351CDSIDSGR includes an integrated reference buffer connected to the REF pin (Pin 5). This buffer operates as a unity-gain follower, providing a low-impedance, stable reference voltage derived from the internal bias network. It directly drives the reference input of SAR or delta-sigma ADCs, eliminating the need for an external op-amp buffer and reducing system component count and board area for the INA351CDSIDSGR.

What is the supply voltage range and quiescent current of the INA351CDSIDSGR?

The INA351CDSIDSGR operates from a single supply of 1.8 V to 5.5 V (or dual supplies of ±0.9 V to ±2.75 V) and draws 110 µA typical quiescent current at 25°C. In shutdown mode (SHDN = logic low), quiescent current drops to ≤1.5 µA. This ultra-low power profile makes the INA351CDSIDSGR ideal for battery-powered applications such as portable medical devices and wireless sensors.

How does the INA351CDSIDSGR handle capacitive loads, and what is its maximum drive capability?

The INA351CDSIDSGR is specified to drive up to 500 pF capacitive loads with less than 20% overshoot in small-signal step response. This capability allows direct connection to ADC input capacitors, filtering networks, or long PCB traces without requiring isolation resistors. For larger loads or improved stability, a series resistor (e.g., 50 Ω) can be added at the output-verified in characterization for the INA351CDSIDSGR across all gain settings.

What package type and thermal characteristics apply to the INA351CDSIDSGR?

The INA351CDSIDSGR uses the 8-pin WSON (DSG) package, measuring 2 mm × 2 mm with an exposed thermal pad connected to V−. Its junction-to-board thermal resistance (R_θJB) is 46.4°C/W, and junction-to-ambient (R_θJA) is 80.3°C/W under standard JEDEC conditions. This thermally efficient package supports reliable operation in compact, sealed enclosures typical of the INA351CDSIDSGR's target applications.