Texas Instruments INA290A3IDCKR

Overview

INA290A3IDCKR from Texas Instruments is a single-channel, high-side current-sense amplifier with 100 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 100 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 INA290A3IDCKR datasheet, INA290A3IDCKR pinout, INA290A3IDCKR application, or INA290A3IDCKR equivalent, key selection criteria include its 100 V/V gain accuracy over −40°C to +125°C, 160-dB DC CMRR, SC-70 package footprint, and suitability for high-voltage, low-drift shunt-based sensing where output swing to rail and low quiescent current (370 µA) are critical.

Technical Context

The INA290A3IDCKR uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current even at 120 V common-mode voltage. Its zero-drift input stage delivers ±0.2 µV/°C offset drift and supports accurate low-V_SENSE operation down to millivolt-level shunt drops.

This device operates exclusively in high-side sensing configurations due to internal topology constraints. It achieves 900 kHz −3 dB bandwidth at 100 V/V gain (C_LOAD = 5 pF), with 2 V/µs slew rate and 0.5% settling in 9 µs - optimized for fast overcurrent detection in telecom and server power systems.

Key Specifications

Pinout & Package

INA290A3IDCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in dense power modules and RRU front-end boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA282A3IDR and MAX40056ASA+T, the INA290A3IDCKR provides superior 120-V common-mode capability and lower offset (±12 µV), making it uniquely suitable for unattenuated 48-V and 12-V server rail monitoring without external components - a key advantage in space-constrained RRU and AAS designs.

Availability

INA290A3IDCKR 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 feedback requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA290A3IDCKR 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 designed specifically for ultra-precise, high-common-mode current sensing in next-generation telecom infrastructure, datacenter power systems, and industrial automation - emphasizing zero-drift stability, wide voltage range, and minimal PCB footprint.

FAQ

What is the maximum common-mode voltage the INA290A3IDCKR can withstand?

The INA290A3IDCKR supports an operational common-mode input range of 2.7 V to 120 V and a survival rating of −20 V to +122 V. This allows direct connection to 48-V and 12-V bus rails in servers and RRUs without external attenuation or level-shifting circuitry. The device's internal topology restricts use to high-side sensing only, and minimum common-mode voltage depends on supply voltage per Figure 7-1 in the datasheet.

Does the INA290A3IDCKR require external gain-setting resistors?

No, the INA290A3IDCKR features a factory-trimmed, fixed 100 V/V gain implemented via precision internal resistor networks. 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 gain error remains ≤±0.1% across −40°C to +125°C, eliminating calibration overhead in production.

What is the bandwidth of the INA290A3IDCKR at its specified 100 V/V gain?

The INA290A3IDCKR delivers a −3 dB bandwidth of 900 kHz at 100 V/V gain with a 5-pF load capacitance. Bandwidth decreases slightly at higher gains (e.g., 850 kHz at 200 V/V) and increases with larger differential input signals. This 900-kHz bandwidth supports reliable detection of sub-microsecond overcurrent events in telecom power stages, with 9 µs settling to 0.5% for a 4-V step.

Can the INA290A3IDCKR operate from a 3.3-V supply?

Yes, the INA290A3IDCKR operates from a supply voltage range of 2.7 V to 20 V, fully supporting 3.3-V systems. At 3.3 V, the output swing is guaranteed to reach within 70 mV of VS and 25 mV above GND across −40°C to +125°C. Quiescent current remains 370 µA (typ), making it suitable for low-power always-on monitoring in battery-backed or standby subsystems.

How does the zero-drift architecture of the INA290A3IDCKR improve measurement accuracy?

Zero-drift architecture in the INA290A3IDCKR actively corrects input offset voltage and its temperature drift, delivering ±12 µV maximum offset and ±0.2 µV/°C maximum drift over −40°C to +125°C. This eliminates baseline drift errors in long-duration measurements and enables accurate low-current sensing (e.g., <100 mA with 10 mΩ shunt) without periodic recalibration - essential for field-deployed telecom and server equipment.