Texas Instruments INA2290A5IDGKT

Overview

INA2290A5IDGKT from Texas Instruments is a dual-channel, ultra-precise current-sense amplifier optimized for high-side sensing in 48-V and 120-V systems. It delivers ±12 µV max offset voltage, ±0.15% max gain error, 500 V/V fixed gain, 1.1-MHz bandwidth at A5 gain, and operates from 2.7 V to 20 V supply - enabling accurate, high-speed current monitoring in telecom power supplies and mMIMO active antenna systems.

For engineers reviewing the INA2290A5IDGKT datasheet, INA2290A5IDGKT pinout, INA2290A5IDGKT application, or INA2290A5IDGKT equivalent, key selection criteria include its 500 V/V gain configuration, dual-channel isolation (≥140 dB channel separation), 160-dB DC CMRR, and VSSOP-8 package compatibility with space-constrained 48-V rack server and macro RRU designs.

Technical Context

The INA2290A5IDGKT employs 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 ±0.2 µV/°C offset drift and enables low-V_SENSE operation down to 8 mV full-scale at 500 V/V gain.

This dual-channel device is strictly high-side only - not suitable for low-side sensing - and features independent inputs (IN+1/IN−1, IN+2/IN−2) and outputs (OUT1/OUT2), with no internal cross-coupling. Channel separation exceeds 140 dB at DC and remains ≥85 dB at 100 kHz, supporting simultaneous, isolated current measurements in multi-rail power domains.

Key Specifications

Pinout & Package

The INA2290A5IDGKT 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 (R_θJB = 91.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, dual-channel current-sense amplifier applications.

Compared with INA2290A4IDGKT, the INA2290A5IDGKT provides 2.5× higher gain for improved SNR with ultra-low-resistance shunts, while INA240A2EDRGT trades precision for bidirectional capability and broader industrial operating margins - making the INA2290A5IDGKT optimal for telecom-grade 48-V/120-V unidirectional sensing where µV-level accuracy is mandatory.

Availability

INA2290A5IDGKT 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 production ramp.

Supply support for INA2290A5IDGKT 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 INA2290A5IDGKT belongs to TI's INAx290 family of ultra-precise current-sense amplifiers, designed specifically for high-side, wide common-mode (2.7–120 V), high-bandwidth current monitoring in next-generation telecom infrastructure and high-efficiency server power systems.

FAQ

What is the maximum common-mode voltage the INA2290A5IDGKT can withstand?

The INA2290A5IDGKT supports an operational common-mode input range from 2.7 V to 120 V and survives transient overvoltages up to +122 V and −20 V. This makes it suitable for direct connection to 48-V and 120-V bus lines in telecom and server applications without external level-shifting circuitry. The device's internal architecture restricts use to high-side sensing only - it cannot be used for low-side current measurement.

Does the INA2290A5IDGKT require external gain-setting resistors?

No, the INA2290A5IDGKT uses a precision internal resistor network to set its fixed 500 V/V gain - no external components are needed or recommended. TI explicitly advises against adding external resistors to modify gain, as internal resistor ratios are tightly matched but absolute values vary significantly across units. This monolithic gain architecture ensures consistent performance and eliminates layout sensitivity associated with external feedback networks.

How does the INA2290A5IDGKT handle high-frequency noise on the power bus?

The INA2290A5IDGKT achieves 85-dB AC CMRR at 50 kHz and maintains >85 dB up to 100 kHz, effectively rejecting high-frequency switching noise from DC/DC converters. Its transconductance architecture and current-feedback design minimize susceptibility to fast dv/dt transients. For optimal noise immunity, TI recommends short, symmetric PCB traces to the shunt resistor and local 100-nF ceramic decoupling at the VS pin - practices validated in TI's reference layouts for macro RRU designs.

Can the two channels of the INA2290A5IDGKT be used independently in different power domains?

Yes, the INA2290A5IDGKT's dual channels operate fully independently - each has dedicated IN+, IN−, and OUT pins with no shared signal path. Channel separation exceeds 140 dB at DC and remains ≥85 dB at 100 kHz, enabling simultaneous, isolated current measurements on separate 48-V rails (e.g., CPU and memory VRMs) without crosstalk. Both channels share only the VS and GND connections, which must be routed with low-inductance paths to preserve accuracy.

What is the minimum shunt voltage the INA2290A5IDGKT can accurately measure at full scale?

At its 500 V/V gain setting, the INA2290A5IDGKT achieves full-scale output (e.g., 4 V with 5-V supply) with just 8 mV across the shunt resistor. Combined with ±12 µV max offset and ±0.2 µV/°C drift, this enables accurate measurement of currents as low as ~8 mA through a 1-mΩ shunt - ideal for standby current monitoring in 48-V systems where minimizing I²R loss is critical to efficiency compliance.