Texas Instruments INA290A2IDCKR

Overview

INA290A2IDCKR from Texas Instruments is a single-channel, high-side current-sense amplifier with 50 V/V fixed gain, 2.7 V to 120 V common-mode input range, ±12 µV max offset voltage, ±0.1% max gain error, and 1.1 MHz bandwidth at 50 V/V. It enables ultra-precise DC and transient current monitoring in 48-V server power rails and remote radio units.

For engineers reviewing the INA290A2IDCKR datasheet, INA290A2IDCKR pinout, INA290A2IDCKR application, or INA290A2IDCKR equivalent, this page delivers verified electrical specs, SC-70 package details, functional pin roles, real-world use cases in telecom and datacenter power systems, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA290A2IDCKR uses a transconductance architecture with current-feedback amplifier topology to achieve 20 µA typical input bias current and 120 V common-mode operation while maintaining high AC CMRR (85 dB at 50 kHz) and DC CMRR (160 dB). Its zero-drift design ensures stable offset performance across −40°C to +125°C.

It operates from a single 2.7 V to 20 V supply, draws 370 µA quiescent current per channel, and delivers rail-to-rail output swing (VS − 0.2 V min, GND + 25 mV max) into 10 kΩ loads - enabling direct interface with SAR ADCs without external buffering in precision power monitoring systems.

Key Specifications

Pinout & Package

INA290A2IDCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained power rail monitoring on server motherboards and macro RRU PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA290A2IDCKR, INA282AIDR trades precision for cost and package familiarity, while MAX40056ASA+ delivers better offset performance but sacrifices 55 V of common-mode headroom - making INA290A2IDCKR the optimal balance of 120 V operation, 50 V/V gain, and ±0.1% accuracy in compact SC-70.

Availability

INA290A2IDCKR 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) current sensing requiring stable component supply and long-term production continuity.

Supply support for INA290A2IDCKR 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 chain and power management ICs.

The INA290 family was designed specifically for ultra-precise, high-common-mode current sensing in next-generation datacenter, telecom, and industrial power systems - emphasizing zero-drift stability, wide voltage range, and minimal layout sensitivity.

FAQ

What is the maximum common-mode voltage supported by the INA290A2IDCKR?

The INA290A2IDCKR supports an operational common-mode input voltage range of 2.7 V to 120 V, with survival capability up to −20 V to +122 V. This allows direct high-side sensing on 48-V and 12-V bus rails without external level-shifting circuitry, and is validated across the full −40°C to +125°C temperature range. The INA290A2IDCKR maintains 160 dB DC CMRR even at 120 V common-mode.

Does the INA290A2IDCKR require external gain-setting resistors?

No, the INA290A2IDCKR features a factory-trimmed, fixed 50 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 between units - only the ratio is matched. The INA290A2IDCKR delivers ±0.1% max gain error and ±5 ppm/°C drift without user adjustment.

Can the INA290A2IDCKR operate from a 3.3-V supply?

Yes, the INA290A2IDCKR operates from a single supply ranging from 2.7 V to 20 V, including standard 3.3-V rails. At 3.3 V, it maintains full functionality: 50 V/V gain, 1.1 MHz bandwidth, and rail-to-rail output swing (GND + 25 mV to 3.1 V). Quiescent current remains 370 µA typical, making it suitable for low-voltage portable test equipment using the INA290A2IDCKR.

What is the output voltage swing specification for the INA290A2IDCKR?

The INA290A2IDCKR provides rail-to-rail output swing: minimum high-level output is VS − 0.2 V, and minimum low-level output is GND + 25 mV (at −40°C to +125°C, RL = 10 kΩ). This allows direct interfacing with 12-bit SAR ADCs having 0–5 V or 0–3.3 V input ranges without external level-shifting. The INA290A2IDCKR achieves this while maintaining <0.1% gain error across the full output range.

Is the INA290A2IDCKR suitable for bidirectional current sensing?

No, the INA290A2IDCKR is a high-side-only, unidirectional current-sense amplifier. Its internal topology restricts operation to sensing current flowing from IN+ to IN− (i.e., from supply to load), and it cannot measure reverse current or support bipolar output swing. For bidirectional applications, TI recommends the INA229 or INA240 families - the INA290A2IDCKR is optimized exclusively for precision unidirectional high-side monitoring.