Texas Instruments INA2290A2IDGKR

Overview

INA2290A2IDGKR from Texas Instruments is a dual-channel, ultra-precise current-sense amplifier designed 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 1.1-MHz bandwidth at 50 V/V gain-enabling accurate real-time current monitoring in telecom power supplies and server rack PDUs.

For engineers reviewing the INA2290A2IDGKR datasheet, INA2290A2IDGKR pinout, INA2290A2IDGKR application, or INA2290A2IDGKR equivalent, key selection criteria include its 50 V/V fixed gain, 2.7–20-V supply range, dual-channel isolation, and guaranteed operation from –40°C to +125°C in VSSOP-8 packaging.

Technical Context

The INA2290A2IDGKR uses a transconductance architecture with current-feedback amplifiers to achieve low input bias current (20 µA typ) and high common-mode rejection-160 dB DC CMRR and 85 dB AC CMRR at 50 kHz. Its zero-drift topology ensures stable offset performance across temperature.

As a dual-channel device, it supports independent high-side current sensing on two separate rails without crosstalk (channel separation >140 dB at 100 kHz), and operates with a minimum supply of 2.7 V while surviving common-mode voltages up to +122 V and down to –20 V.

Key Specifications

Pinout & Package

The INA2290A2IDGKR 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 performance in high-density power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2IDR and MAX40056AUB+, the INA2290A2IDGKR provides integrated dual-channel operation, superior 120-V common-mode capability, and lowest offset-making it optimal for space-constrained, high-reliability 48-V/120-V telecom and server power monitoring where channel count and accuracy are primary.

Availability

INA2290A2IDGKR is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, and active antenna systems requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and telecom deployments.

Supply support for INA2290A2IDGKR 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 INA2290 belongs to TI's INAx290 family of ultra-precise current-sense amplifiers, engineered specifically for high-side, wide common-mode current monitoring in next-generation 48-V and 120-V power infrastructure-including 5G base stations, AI servers, and industrial UPS systems.

FAQ

What is the maximum common-mode voltage the INA2290A2IDGKR can safely measure?

The INA2290A2IDGKR supports an operational common-mode input range of 2.7 V to 120 V and survives transient voltages from –20 V to +122 V. This makes it suitable for direct high-side sensing on 48-V and 120-V telecom rectifier outputs without external level-shifting circuitry. The device remains functional and accurate across this full range when powered from 2.7–20 V.

Does the INA2290A2IDGKR require external gain-setting resistors?

No. The INA2290A2IDGKR features a factory-trimmed, fixed 50 V/V gain implemented via an internal precision resistor network. External resistors are neither required nor recommended, as TI specifies that adding external components may degrade accuracy due to mismatch and parasitic effects. The A2 suffix explicitly denotes the 50 V/V variant.

Can the INA2290A2IDGKR be used for bidirectional current sensing?

No. The INA2290A2IDGKR is a high-side–only current-sense amplifier with unidirectional input architecture. Its input pins (IN+ and IN–) are not symmetrical: IN+ must connect to the higher-potential side of the shunt, and IN– to the lower-potential side. It cannot measure reverse current flow or operate in low-side configurations.

What is the thermal performance of the INA2290A2IDGKR in the DGK package?

In its 8-pin VSSOP (DGK) package, the INA2290A2IDGKR has a junction-to-ambient thermal resistance (RθJA) of 169.3°C/W and junction-to-board (RθJB) of 91.3°C/W. For reliable operation at full ambient (125°C), TI recommends connecting the exposed thermal pad to a solid GND plane and limiting power dissipation to ≤300 mW using the 680–900 µA quiescent current spec.

How does the INA2290A2IDGKR handle high-frequency noise from switching regulators?

The INA2290A2IDGKR achieves 85 dB AC CMRR at 50 kHz and maintains >140 dB channel separation up to 100 kHz, effectively rejecting common-mode noise from nearby DC-DC converters. Its zero-drift architecture also suppresses 1/f noise, and the 1.1-MHz bandwidth allows designers to pair it with simple RC filters without sacrificing response time for overcurrent protection.