Texas Instruments INA823DGKR

Overview

INA823DGKR from Texas Instruments is a precision instrumentation amplifier optimized for low-power, wide-supply (2.7 V to 36 V single or ±1.35 V to ±18 V dual) operation in battery-powered and industrial signal-conditioning systems. It delivers 20 µV typical input offset voltage, 180 µA quiescent current, 1.9 MHz bandwidth at G = 1, ±60 V input overvoltage protection, and operates across –40°C to +125°C - enabling use in ECG front-ends and portable infusion pumps.

For engineers reviewing the INA823DGKR datasheet, INA823DGKR pinout, INA823DGKR application, or INA823DGKR equivalent, key selection considerations include its rail-to-rail output capability, gain-setting via external resistor (G = 1 to 10,000), stable operation with 1-nF capacitive loads, and guaranteed CMRR ≥120 dB at G ≥ 100 - critical for high-accuracy bridge sensor interfaces and medical analog front-ends.

Technical Context

The INA823DGKR employs a three-op-amp architecture with integrated overvoltage protection circuitry on both inputs, allowing safe operation with input voltages up to ±60 V beyond supply rails. Its input stage extends 150 mV below negative supply, supporting true single-supply operation down to 2.7 V.

Gain is set by a single external resistor between pins 1 and 8 (RG), following G = 1 + 100 kΩ / RG. The device maintains precision performance across temperature: input offset drift ≤0.2 ppm/°C at G = 1 and ≤35 ppm/°C at G > 1, with PSRR ≥100 dB (G = 1) and CMRR ≥120 dB (G ≥ 100) over full common-mode range.

Key Specifications

Pinout & Package

INA823DGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm), optimized for space-constrained PCB layouts in portable medical devices and sensor modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA826IDGKR and INA819IDGKR, the INA823DGKR uniquely balances ultra-low power, robust ±60 V input protection, and 120 dB CMRR at high gain - making it optimal for cost-sensitive, safety-critical medical and industrial sensor nodes where reliability and supply flexibility outweigh marginal noise or output swing advantages.

Availability

INA823DGKR is available at Aetrix Electronics and suitable for ECG front-ends, portable infusion pumps, and industrial analog input modules requiring stable component supply, long-term lifecycle support, and traceable sourcing for FDA-regulated or IEC 61508-compliant designs.

Supply support for INA823DGKR 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 INA823 belongs to TI's precision instrumentation amplifier product line, designed specifically for low-power, wide-supply, high-CMRR signal conditioning in medical diagnostics, portable instrumentation, and harsh-environment industrial sensing.

FAQ

What is the maximum gain achievable with the INA823DGKR?

The INA823DGKR supports gains from 1 to 10,000, set by a single external resistor between pins 1 and 8 using the equation G = 1 + 100 kΩ / RG. At G = 10,000, the required RG is 10 Ω; layout parasitics and resistor tolerance must be considered for precision applications. The INA823DGKR maintains ≥120 dB CMRR only at G ≥ 100.

Does the INA823DGKR require external protection diodes for ±60 V input overvoltage?

No - the INA823DGKR integrates internal overvoltage protection circuitry on both inputs, rated for continuous operation at ±60 V beyond the supply rails. This eliminates the need for external clamping diodes or series resistors in field-connected sensor interfaces, reducing board area and component count in designs such as industrial flow transmitters.

Can the INA823DGKR operate from a 3.3-V single supply?

Yes - the INA823DGKR is fully specified from 2.7 V to 36 V single supply (or ±1.35 V to ±18 V dual). At 3.3 V, it delivers 180 µA quiescent current, 20 µV offset, and retains input common-mode range extending 150 mV below ground, enabling true single-supply operation in battery-powered IoT sensor nodes without level-shifting circuitry.

What is the output voltage swing specification for the INA823DGKR?

The INA823DGKR provides rail-to-rail output swing, specified as (–VS) + 0.15 V to (+VS) – 0.15 V under load. For example, with ±15 V supplies, output swings from –14.85 V to +14.85 V into 10 kΩ. This 150-mV headroom ensures stability and linearity across temperature and supply variations, unlike true rail-to-rail amplifiers that may degrade near supply rails.

How does the INA823DGKR handle capacitive loads?

The INA823DGKR is internally compensated for stable operation with up to 1000 pF capacitive loads at the output, as confirmed in the datasheet's "Stable operation" specification. This allows direct connection to anti-aliasing RC filters or ADC input capacitors without external isolation resistors or phase-compensation networks - simplifying layout and improving signal integrity in high-precision data acquisition systems.