Texas Instruments INA2290A3IDGKR

Overview

INA2290A3IDGKR from Texas Instruments is a dual-channel, ultra-precise current-sense amplifier optimized for high-side sensing in 48-V and 120-V power rails. It delivers ±12 µV max input offset voltage, ±0.1% max gain error, 100 V/V fixed gain, and 1.1-MHz bandwidth at A3 gain-enabling accurate, high-speed current monitoring in telecom power supplies and server PDUs.

For engineers reviewing the INA2290A3IDGKR datasheet, INA2290A3IDGKR pinout, INA2290A3IDGKR application, or INA2290A3IDGKR equivalent, key selection criteria include its 120-V common-mode range, dual-channel isolation, 160-dB DC CMRR, and compatibility with low-ohmic shunts in high-density, thermally constrained systems.

Technical Context

The INA2290A3IDGKR uses a transconductance architecture with current-feedback amplifiers to achieve 20 µA typical input bias current and support operation up to 120 V common-mode while maintaining high precision. Its zero-drift topology ensures stable offset performance across −40°C to +125°C.

This dual-channel device implements independent, matched signal paths with 85-dB AC CMRR at 50 kHz and channel separation >140 dB at 100 kHz-critical for simultaneous multi-rail monitoring without crosstalk in macro RRUs and active antenna systems.

Key Specifications

Pinout & Package

The INA2290A3IDGKR is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, with exposed thermal pad recommended for GND connection to optimize thermal resistance (R_θJA = 169.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA240A3IDR and MAX40086AUA+, the INA2290A3IDGKR uniquely combines dual-channel 120-V sensing, 900-kHz bandwidth, and ±12 µV offset in a space-constrained VSSOP package-making it the only option for compact, high-precision, multi-rail monitoring in next-gen telecom and server hardware.

Availability

INA2290A3IDGKR is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current telemetry, and active antenna system (AAS) element-level sensing requiring stable component supply and long-term production continuity.

Supply support for INA2290A3IDGKR 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 conditioning and power management ICs.

The INAx290 family-including INA2290A3IDGKR-is designed specifically for ultra-precise, high-common-mode current sensing in telecom infrastructure, enterprise servers, and industrial power systems where accuracy, speed, and reliability are non-negotiable.

FAQ

What is the maximum common-mode voltage supported by the INA2290A3IDGKR?

The INA2290A3IDGKR supports an operational common-mode input voltage range of 2.7 V to 120 V, with survival capability up to −20 V and +122 V. This allows direct high-side sensing on 48-V, 54-V, and 120-V power rails without external level-shifting circuitry-critical for telecom and server applications where bus voltage exceeds standard op-amp limits.

Does the INA2290A3IDGKR require external gain-setting resistors?

No. The INA2290A3IDGKR features a factory-trimmed, fixed 100 V/V gain implemented via an internal precision resistor network. External resistors are not supported or recommended, as TI specifies that gain accuracy and drift performance rely entirely on the monolithic internal structure-adding external components degrades specified ±0.1% gain error and ±5 ppm/°C drift.

How does the dual-channel architecture of the INA2290A3IDGKR improve system design?

The INA2290A3IDGKR integrates two fully independent current-sense amplifiers in one VSSOP package, eliminating inter-channel crosstalk (≥140 dB at 100 kHz) and reducing PCB area versus discrete solutions. This enables simultaneous monitoring of primary and backup power rails or input/output currents in a single footprint-streamlining layout and improving measurement correlation in time-critical protection schemes.

What is the guaranteed input offset voltage specification for the INA2290A3IDGKR over temperature?

The INA2290A3IDGKR guarantees a maximum input offset voltage of ±12 µV at room temperature, with a worst-case drift of ±0.2 µV/°C over −40°C to +125°C. This results in ≤±2.6 µV total offset variation across the full operating range-enabling sub-milliamp current resolution with standard 10 mΩ shunts in uncalibrated industrial deployments.

Can the INA2290A3IDGKR operate from a 3.3-V supply?

Yes. The INA2290A3IDGKR operates from a single supply ranging from 2.7 V to 20 V, including standard 3.3-V logic rails. At 3.3 V, its output swing remains functional (GND + 5 mV to VS − 200 mV), and quiescent current stays within 680–900 µA-making it compatible with mixed-voltage systems where analog sensing coexists with low-power digital controllers.