Texas Instruments INA2290A3IDGKT

Overview

INA2290A3IDGKT 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 ±0.1% gain error, ±12 µV max input offset voltage, and 100 V/V fixed gain with 900 kHz bandwidth (at 100 V/V) across –40°C to +125°C. Used in macro remote radio units and 48-V server power supplies for real-time overcurrent protection and precision telemetry.

For engineers reviewing the INA2290A3IDGKT datasheet, INA2290A3IDGKT pinout, INA2290A3IDGKT application, or INA2290A3IDGKT equivalent, key selection criteria include common-mode range (2.7 V to 120 V), dual-channel channel separation (>140 dB at DC), low quiescent current (680–900 µA), and guaranteed A3-gain accuracy under extended temperature operation.

Technical Context

The INA2290A3IDGKT employs a transconductance architecture with current-feedback amplifiers, enabling 20 µA typical input bias current even at 120 V common-mode voltage. Its zero-drift topology ensures stable offset performance (±0.2 µV/°C drift) and supports low-V_SENSE operation down to 40 mV full-scale for accurate low-current sensing.

It operates exclusively in high-side configuration due to internal topology constraints, with minimum common-mode voltage tied to supply voltage (V_CM(min) ≈ V_S). Channel separation exceeds 140 dB at DC and remains >100 dB up to 100 kHz, critical for dual-rail monitoring in dense RF power systems.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2290A3IDGKT, INA240A3IDR trades dual-channel integration for programmable gain and bidirectional sensing, while MAX40056AUB+ offers higher bandwidth at the cost of reduced gain accuracy and added external component count - making INA2290A3IDGKT optimal for space-constrained, high-precision dual-rail telecom and server monitoring.

Availability

INA2290A3IDGKT is available at Aetrix Electronics and suitable for active antenna systems, macro remote radio units, and 48-V rack server power supplies requiring stable component supply, long-term production continuity, and guaranteed TI original packaging.

Supply support for INA2290A3IDGKT 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 INA2290A3IDGKT belongs to TI's INAx290 ultra-precise current-sense amplifier family, engineered specifically for high-reliability, high-bandwidth current monitoring in telecom infrastructure, enterprise power systems, and industrial 48-V/120-V applications.

FAQ

What is the maximum common-mode voltage the INA2290A3IDGKT can withstand continuously?

The INA2290A3IDGKT supports continuous operation from 2.7 V to 120 V common-mode input voltage. Its survival rating extends to –20 V to +122 V, allowing it to endure transient overvoltage events such as load dumps in 48-V systems without damage. This rating is validated per TI's absolute maximum specifications and applies to both IN+ and IN− pins simultaneously.

Does the INA2290A3IDGKT support bidirectional current sensing?

No, the INA2290A3IDGKT is designed exclusively for unidirectional, high-side current sensing. Its internal topology restricts operation to positive V_SENSE (IN+ > IN−), and it does not support negative differential inputs or bidirectional measurement. For bidirectional applications, TI recommends the INA240 series or similar devices explicitly rated for ±V_SENSE operation.

What is the thermal performance of the INA2290A3IDGKT in its VSSOP-8 package?

The INA2290A3IDGKT in DGK (VSSOP-8) package has a junction-to-ambient thermal resistance (R_θJA) of 169.3°C/W under standard JEDEC test conditions. With its exposed thermal pad optionally connected to PCB ground, thermal performance improves significantly - R_θJB is 91.3°C/W, enabling reliable operation at full specification across –40°C to +125°C ambient when mounted on 2-oz copper with ≥4 thermal vias.

How does the INA2290A3IDGKT achieve 900 kHz bandwidth at 100 V/V gain?

The INA2290A3IDGKT achieves 900 kHz bandwidth at 100 V/V through a multistage transconductance architecture with current-feedback amplifiers. Unlike conventional op-amp-based current-sense amplifiers, this design decouples gain-setting from dominant-pole frequency limitations, maintaining high slew rate (2 V/µs) and stable phase margin across all five factory-set gains - verified in Figure 6-10 of the SBOS961C datasheet.

Can the INA2290A3IDGKT be used with a 3.3-V supply?

Yes, the INA2290A3IDGKT operates with a supply voltage from 2.7 V to 20 V, fully supporting 3.3-V systems. At 3.3 V, its output swing is specified from GND + 5 mV to V_S – 70 mV (i.e., 3.23 V max), and quiescent current remains within 680–900 µA. However, common-mode input range is limited to ≥2.7 V under 3.3-V supply per Figure 7-1, making it unsuitable for sub-2.7-V rail monitoring.