Texas Instruments INA2290A4IDGKT

Overview

INA2290A4IDGKT 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 (max), ±12 µV input offset voltage (max), and 1.1-MHz bandwidth at 200 V/V gain - enabling accurate, high-speed current monitoring in telecom and server power systems.

For engineers reviewing the INA2290A4IDGKT datasheet, INA2290A4IDGKT pinout, INA2290A4IDGKT application, or INA2290A4IDGKT equivalent, key selection criteria include its 200 V/V fixed gain, 2.7–20-V supply range, −40°C to +125°C operation, and VSSOP-8 package compatibility with space-constrained 48-V rack server and macro RRU designs.

Technical Context

The INA2290A4IDGKT 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, 85 dB AC at 50 kHz) across 2.7 V to 120 V common-mode range. Its zero-drift topology ensures stable offset performance over temperature.

This dual-channel device operates exclusively in high-side configuration - IN+ and IN− inputs are referenced to bus voltage and load side of shunt, respectively - and supports independent channel operation with >140 dB channel separation up to 100 kHz.

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 INA2290A4IDGKT, INA240A4IDR offers bidirectional capability at the cost of bandwidth and voltage rating, while MAX40056ASA+ provides superior offset performance but lacks telecom-grade 120-V survivability - making INA2290A4IDGKT the only option qualified for 48-V rack server and macro RRU high-reliability deployments.

Availability

INA2290A4IDGKT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current supervision, and active antenna system (AAS) element-level sensing requiring stable component supply and long-term industrial lifecycle support.

Supply support for INA2290A4IDGKT 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 series belongs to TI's ultra-precise current-sense amplifier product line, engineered specifically for high-bandwidth, high-common-mode industrial and telecom power systems where accuracy, reliability, and thermal stability are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA2290A4IDGKT can withstand continuously?

The INA2290A4IDGKT supports continuous operation from 2.7 V to 120 V common-mode input voltage. Its survival rating extends to −20 V to +122 V, making it suitable for telecom power systems with transient surges. This 120-V rating is confirmed in Section 6.1 Absolute Maximum Ratings and applies directly to the INA2290A4IDGKT variant per SBOS961C datasheet revision C.

Does the INA2290A4IDGKT support bidirectional current sensing?

No, the INA2290A4IDGKT is a high-side-only current-sense amplifier with dedicated IN+ and IN− inputs referenced to the bus and load sides of the shunt, respectively. It does not support true bidirectional sensing - output polarity remains positive for current flow in the intended direction. Bidirectional capability requires devices like the INA240 series, which are explicitly designed for that function.

What is the recommended PCB layout practice for the IN+ and IN− pins of the INA2290A4IDGKT?

For optimal CMRR and accuracy, route IN+1/IN−1 and IN+2/IN−2 as matched-length, tightly coupled differential pairs with minimum loop area. Place the shunt resistor directly adjacent to the IC, using Kelvin connections - never share traces between channels. Ground the thermal pad to a solid analog ground plane, and isolate sensitive analog routing from noisy digital or power planes per TI's Layout Guidelines in Section 10 of SBOS961C.

Can the INA2290A4IDGKT operate from a 3.3-V supply?

Yes, the INA2290A4IDGKT operates from 2.7 V to 20 V supply voltage, fully specified down to 2.7 V. At 3.3 V, it maintains 200 V/V gain, ±0.15% gain error, and rail-to-rail output swing (0.005 V to 3.23 V). Quiescent current remains within 680–900 µA, and all electrical characteristics in Section 6.5 are guaranteed across this supply range per Recommended Operating Conditions.

How does the 200 V/V gain of the INA2290A4IDGKT affect shunt resistor selection?

With 200 V/V gain, a 5-mV full-scale shunt voltage produces a 1-V output - ideal for direct interface with 1-V FS ADCs. For a target full-scale current of 10 A, select a 0.5-mΩ shunt (10 A × 0.5 mΩ = 5 mV). Lower shunt values reduce I²R loss but require tighter layout control; higher values increase self-heating error. The INA2290A4IDGKT's ±12 µV offset allows accurate measurement down to ~60 mA with a 0.5-mΩ shunt.