Texas Instruments INA290A5IDCKR

Overview

INA290A5IDCKR from Texas Instruments is a single-channel, high-side current-sense amplifier with 500 V/V fixed gain, 2.7–120 V common-mode input range, ±12 µV max offset voltage, and 800 kHz bandwidth (at 500 V/V). It enables ultra-precise low-V_SENSE current measurement in 48-V server power rails and fast overcurrent protection circuits.

For engineers reviewing the INA290A5IDCKR datasheet, INA290A5IDCKR pinout, INA290A5IDCKR application, or INA290A5IDCKR equivalent, this page delivers verified specifications, SC-70 package layout, real-world use cases in telecom and data center power systems, and two validated alternative parts with documented technical differences.

Technical Context

The INA290A5IDCKR uses a transconductance architecture with current-feedback amplification to achieve 20 µA typical input bias current at 120 V common-mode voltage and supports only high-side sensing due to internal topology constraints. Its zero-drift design ensures ±0.2 µV/°C offset drift and 160 dB DC CMRR for stable DC accuracy across –40°C to +125°C.

Bandwidth is gain-dependent: 800 kHz at 500 V/V (with 8 mV V_SENSE), 2 V/µs slew rate, and 9 µs settling time to 0.5%. It operates from 2.7 V to 20 V supply, draws 370–600 µA quiescent current, and features rail-to-rail output swing (VS – 0.2 V min, 25 mV above GND).

Key Specifications

Pinout & Package

INA290A5IDCKR is housed in a 5-pin SC-70 package (2.00 mm × 1.25 mm body size) with exposed pad option not specified in datasheet; thermal pad may be left floating or connected to GND per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA290A5IDCKR, INA240A5IDR trades 120-V survivability and 800-kHz bandwidth for SOIC-8 manufacturability, while MAX40056ASA+T sacrifices ±12 µV offset for +400 kHz bandwidth-making INA290A5IDCKR optimal for high-accuracy, high-CM, high-speed 48-V infrastructure monitoring.

Availability

INA290A5IDCKR is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) protection, and active antenna system (AAS) calibration requiring stable component supply and long-term production continuity.

Supply support for INA290A5IDCKR 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 INA290 family was designed specifically for ultra-precise, high-common-mode current sensing in next-generation 48-V data center, telecom, and industrial power systems-emphasizing DC accuracy, AC noise rejection, and thermal stability.

FAQ

What is the maximum common-mode voltage the INA290A5IDCKR can withstand continuously?

The INA290A5IDCKR supports continuous operation from 2.7 V to 120 V common-mode input voltage, with survival rating up to +122 V and –20 V. This allows direct connection to 48-V and 12-V bus rails without external protection components, and accommodates transient overvoltage events in telecom power systems. The device remains functional within its recommended operating conditions across the full –40°C to +125°C temperature range.

Does the INA290A5IDCKR support low-side current sensing configurations?

No, the INA290A5IDCKR is explicitly designed for high-side-only current sensing due to its internal transconductance architecture and current-feedback amplifier topology. The datasheet confirms it cannot be used in low-side configurations. Attempting low-side connection violates the minimum common-mode voltage constraint relative to VS and may cause inaccurate output or damage. For low-side sensing, TI recommends alternatives like the INA199 or INA210 families.

What is the typical quiescent current of the INA290A5IDCKR at 5 V supply and 25°C?

The INA290A5IDCKR draws 370 µA typical quiescent current at 5 V supply and 25°C, with a maximum of 500 µA under those conditions. At full temperature range (–40°C to +125°C), quiescent current rises to 600 µA maximum. This ultra-low power consumption enables integration into always-on telemetry circuits in energy-sensitive 48-V server and RRU applications without impacting system efficiency.

How does the 500 V/V gain of the INA290A5IDCKR affect minimum detectable current with a 2 mΩ shunt resistor?

With a 2 mΩ shunt resistor, the INA290A5IDCKR's 500 V/V gain yields 1 V output per 1 A sensed current. Given its ±12 µV max input offset, the minimum resolvable current is ~24 mA (12 µV ÷ 500 V/V ÷ 0.002 Ω), enabling precise monitoring of standby and light-load conditions in 48-V server VRMs. This resolution holds across –40°C to +125°C due to ±0.2 µV/°C offset drift.

Is the SC-70 package of the INA290A5IDCKR compatible with reflow soldering per J-STD-020?

Yes, the INA290A5IDCKR in SC-70 (DCK) package is qualified for standard Pb-free reflow soldering per J-STD-020 Rev E, with peak temperature rating of 260°C for 30 seconds maximum. Thermal resistance data (R_θJA = 191.6°C/W) and layout guidance in the datasheet confirm suitability for automated assembly in high-density server and telecom PCBs using standard IR or vapor-phase reflow profiles.