Texas Instruments INA819IDRGR

Overview

INA819IDRGR from Texas Instruments is a precision instrumentation amplifier optimized for low-power, high-accuracy signal conditioning in harsh industrial and medical sensor interfaces. It delivers 35 µV max input offset voltage, 8 nV/√Hz input voltage noise, 2 MHz bandwidth at G = 1, ±60 V input overvoltage protection, and operates from ±2.25 V to ±18 V dual supply - enabling direct connection to strain gauges and ECG electrodes without external protection.

For engineers reviewing the INA819IDRGR datasheet, INA819IDRGR pinout, INA819IDRGR application, or INA819IDRGR equivalent, key selection criteria include its 385 µA max quiescent current, 110 dB min CMRR at G = 10, gain-setting via single external resistor (G = 1 to 10,000), stable operation with 1-nF capacitive loads, and WSON-8 package suitability for space-constrained analog front-ends.

Technical Context

The INA819IDRGR uses super-beta input transistors to achieve ultra-low input offset voltage drift (0.35 µV/°C max) and sub-nanoampere input bias current (0.5 nA max), enabling high-impedance sensor interfacing without significant error. Its three-op-amp architecture separates gain-setting (RG pins 2 & 3) from reference (REF pin 6) and output (OUT pin 7), allowing precise level-shifting and rail-to-rail compatible output swing.

Input stage common-mode rejection exceeds 90 dB across full input range at G = 1, while PSRR remains ≥110 dB across gains - critical for rejecting power-supply ripple in battery-powered portable diagnostics and process analyzers where supply regulation is limited.

Key Specifications

Pinout & Package

INA819IDRGR is housed in an 8-pin WSON package (3.0 mm × 3.0 mm, 0.75-mm height) with exposed thermal pad internally connected to –VS. The package supports reflow soldering and provides low thermal resistance (R_θJA = 55.6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA821IDRGR and INA828IDGKR, the INA819IDRGR uniquely balances ultra-low offset (35 µV), industry-leading low power (385 µA), and robust ±60 V input protection - making it optimal for portable medical devices and battery-operated field instruments where accuracy, longevity, and fault resilience are co-prioritized.

Availability

INA819IDRGR is available at Aetrix Electronics and suitable for analog input modules, electrocardiogram (ECG) monitors, battery test systems, process analytics instrumentation, and surgical equipment requiring stable component supply across extended production lifecycles.

Supply support for INA819IDRGR 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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain solutions.

The INA819 belongs to TI's high-precision instrumentation amplifier product line, engineered specifically for demanding sensor interface applications where low offset, low noise, and input ruggedness are non-negotiable - including medical diagnostics, industrial process control, and portable test equipment.

FAQ

What is the maximum gain achievable with INA819IDRGR?

The INA819IDRGR supports a gain range of 1 to 10,000, set by a single external resistor connected between pins 2 and 3 using the equation G = 1 + 50 kΩ/R_G. At G = 10,000, R_G = 5 Ω; however, practical layout considerations (parasitic resistance, thermal EMF) recommend limiting R_G ≥ 10 Ω for stable operation. The INA819IDRGR maintains specified performance across this full range under recommended operating conditions.

Does INA819IDRGR require external components for stability?

No, the INA819IDRGR is unity-gain stable and remains stable with capacitive loads up to 1 nF without external compensation. Its internal architecture eliminates the need for series isolation resistors or RC networks typically required with older instrumentation amplifiers. This simplifies PCB layout and improves reliability in high-EMI environments like motor drives or industrial automation cabinets where INA819IDRGR is commonly deployed.

Can INA819IDRGR operate from a single 5-V supply?

Yes, the INA819IDRGR operates from a single supply as low as +4.5 V. With a +5-V supply, its input common-mode range extends from +2 V to +3 V, and output swing reaches approximately +0.15 V to +4.85 V (with 10-kΩ load). For rail-to-rail input/output capability at 5 V, external level-shifting via the REF pin (pin 6) is required. The INA819IDRGR's design ensures full functionality across the entire specified temperature range (–40°C to +125°C) under single-supply conditions.

How does the thermal pad on the INA819IDRGR WSON package function?

The exposed thermal pad on the INA819IDRGR WSON-8 package is internally connected to the –VS pin (pin 5). To maximize thermal performance and ensure reliable operation at elevated ambient temperatures, the pad must be soldered to a PCB copper pour tied to the negative supply plane. This reduces junction-to-board thermal resistance to 28.6°C/W and prevents thermal shutdown during sustained high-output-current operation. Leaving the pad floating degrades thermal performance and may compromise long-term reliability.

Is INA819IDRGR pin-compatible with other members of the INA8xx family?

The INA819IDRGR shares identical pinout with the INA821IDRGR and INA828IDRGR in the WSON-8 package, including matching RG (pins 2 & 3), REF (pin 6), and OUT (pin 7) assignments. However, it is not pin-compatible with SOIC-8 or VSSOP-8 variants of the same family due to differing pin 1 and pin 4 placements. When substituting within WSON-8, verify gain equation constants (e.g., INA821 uses 49.4 kΩ instead of 50 kΩ) and consult respective datasheets for offset/noise trade-offs before redesign.