Texas Instruments INA2290A4IDGKR

Overview

INA2290A4IDGKR 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 200 V/V fixed gain, ±12 µV max input offset voltage, 160-dB DC CMRR, and 850-kHz bandwidth at A4 gain-enabling accurate, high-speed current monitoring in telecom power supplies and server rack PDUs.

For engineers reviewing the INA2290A4IDGKR datasheet, INA2290A4IDGKR pinout, INA2290A4IDGKR application, or INA2290A4IDGKR equivalent, key selection criteria include its 2.7–20-V supply range, −40°C to +125°C operation, dual-channel isolation, and compatibility with low-ohmic shunts in high-common-mode industrial and communications infrastructure.

Technical Context

The INA2290A4IDGKR uses a transconductance architecture with current-feedback amplifiers to achieve 20 µA typical input bias current and support common-mode voltages up to 120 V while maintaining high precision. Its zero-drift topology ensures stable offset performance across temperature, critical for long-term accuracy in unattended systems.

As a dual-channel device in an 8-pin VSSOP (DGK) package, it provides independent IN+1/IN−1 and IN+2/IN−2 inputs with separate OUT1/OUT2 outputs-enabling simultaneous monitoring of two high-side current paths without crosstalk (channel separation >120 dB at 10 kHz).

Key Specifications

Pinout & Package

The INA2290A4IDGKR 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 enhance thermal performance in high-power density designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA2290A4IDGKR, INA240A4IDR trades 120-V operation and 850-kHz bandwidth for broader bidirectional sensing and lower cost, while MAX40056AUB+ sacrifices common-mode range and temperature grade to achieve smaller 10-pin µMAX packaging-making INA2290A4IDGKR optimal for high-reliability 48–120-V telecom infrastructure.

Availability

INA2290A4IDGKR is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, and active antenna systems requiring stable component supply across multi-year production cycles.

Supply support for INA2290A4IDGKR 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 product line was engineered specifically for ultra-precise, high-common-mode current sensing in next-generation telecom, datacenter, and industrial power systems-prioritizing offset stability, CMRR, and bandwidth over general-purpose flexibility.

FAQ

What is the maximum common-mode voltage supported by the INA2290A4IDGKR?

The INA2290A4IDGKR supports an operational common-mode input range of 2.7 V to 120 V and a survival voltage of −20 V to +122 V. This allows direct high-side sensing on 48-V and 120-V power rails without external level-shifting circuitry. The device's internal architecture restricts use to high-side configurations only-low-side or bidirectional sensing is not supported. All specifications, including CMRR and offset, are guaranteed across this full range.

Does the INA2290A4IDGKR require external gain-setting resistors?

No, the INA2290A4IDGKR features factory-trimmed, fixed 200 V/V gain implemented via an internal precision resistor network. External resistors must not be added to modify gain, as TI explicitly warns that absolute resistor values vary significantly-even though ratios are tightly matched. Adding external components degrades accuracy, increases temperature drift, and voids specified gain error (±0.15% max) and drift (5 ppm/°C) guarantees.

How does the INA2290A4IDGKR handle fast transient events in power systems?

The INA2290A4IDGKR responds to fast transients with 850-kHz bandwidth and 2 V/µs slew rate, achieving 5-µs 1% settling time for 4-V output steps. Its zero-drift architecture maintains offset stability during thermal transients, and the 85-dB AC CMRR at 50 kHz suppresses switching noise from adjacent DC-DC converters. For overcurrent protection, the combination enables reliable detection of sub-5-µs current spikes in server VRMs and telecom RRUs without false triggering.

Can the INA2290A4IDGKR operate from a 3.3-V supply while monitoring a 48-V rail?

Yes, the INA2290A4IDGKR operates from a single 2.7–20-V supply and fully supports monitoring 48-V (or higher) common-mode rails regardless of VS level. With VS = 3.3 V, the output swings from 5 mV to 3.23 V (VS − 0.07 V), delivering a full-scale 200× amplified signal compatible with 3.3-V ADCs. Input bias current remains stable at ~20 µA, and CMRR performance is preserved-enabling low-power, high-voltage sensing in space-constrained designs.

What thermal considerations apply to the INA2290A4IDGKR in continuous operation?

The INA2290A4IDGKR in DGK package has RθJA = 169.3°C/W and RθJB = 91.3°C/W. At 900 µA quiescent current and 5-V supply, power dissipation is ~4.5 mW-resulting in <0.8°C junction rise above ambient with proper PCB copper area. TI recommends connecting the exposed thermal pad to a solid GND plane; omitting this increases junction temperature by >25°C under sustained load. Derating is unnecessary below +105°C ambient when layout guidelines are followed.