Texas Instruments INA4290A3IRGVR

Overview

INA4290A3IRGVR from Texas Instruments is a quad-channel, ultra-precise current-sense amplifier designed for high-side sensing in 48-V and 120-V power rails. It delivers ±12 µV max offset voltage, ±0.1% max gain error, and 100 V/V fixed gain with 900 kHz bandwidth (at 100 V/V) across −40°C to +125°C, enabling accurate real-time current monitoring in telecom power supplies and server rack PDUs.

For engineers reviewing the INA4290A3IRGVR datasheet, INA4290A3IRGVR pinout, INA4290A3IRGVR application, or INA4290A3IRGVR equivalent, this page provides verified specifications, validated quad-channel pin mapping, confirmed high-side-only topology constraints, and two rigorously cross-checked alternative parts for precision current sensing in high-common-mode industrial and communications systems.

Technical Context

The INA4290A3IRGVR uses a transconductance architecture with current-feedback amplification to achieve 20 µA typical input bias current and 120-V operational common-mode range. Its zero-drift topology ensures ±0.2 µV/°C offset drift and supports low VSENSE operation down to 40 mV full-scale at 100 V/V gain.

This device is strictly high-side only - it cannot operate in low-side configurations due to internal topology limitations. Channel separation exceeds 140 dB up to 100 kHz, and AC CMRR remains 85 dB at 50 kHz, making it suitable for multichannel simultaneous sensing in dense power-conversion systems.

Key Specifications

Pinout & Package

INA4290A3IRGVR is housed in a 4 mm × 4 mm, 16-pin QFN package (RGV) with exposed thermal pad. The package supports high-density PCB layouts and efficient heat dissipation in multi-rail power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA4290A2IRGVR and INA4290A4IRGVR, the INA4290A3IRGVR strikes a balanced trade-off: its 100 V/V gain maximizes resolution for 40–100 mV shunt drops while retaining 900 kHz bandwidth - ideal for 1–10 A monitoring in 48-V telecom and server power where both accuracy and speed are critical.

Availability

INA4290A3IRGVR 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 guaranteed traceable sourcing.

Supply support for INA4290A3IRGVR 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 family was engineered specifically for ultra-precise, high-common-mode current sensing in next-generation telecom infrastructure, enterprise computing, and industrial power systems - emphasizing zero-drift stability, multichannel isolation, and rugged 120-V operation.

FAQ

What is the maximum common-mode voltage the INA4290A3IRGVR can withstand continuously?

The INA4290A3IRGVR operates continuously from 2.7 V to 120 V common-mode voltage. Its survival rating extends to −20 V to +122 V, allowing tolerance of brief transients such as load dumps or hot-swap events without damage. This makes the INA4290A3IRGVR suitable for 48-V and 120-V DC distribution systems where voltage spikes are common.

Does the INA4290A3IRGVR support low-side current sensing configurations?

No - the INA4290A3IRGVR is strictly a high-side-only current-sense amplifier due to its internal transconductance architecture and current-feedback topology. Attempting low-side sensing violates the minimum common-mode voltage constraint relative to VS and will result in invalid output behavior. For low-side applications, consider TI's INA199 or similar dedicated low-side amplifiers.

What is the output voltage swing capability of the INA4290A3IRGVR at 5-V supply?

At VS = 5 V, the INA4290A3IRGVR delivers a minimum output swing of GND + 5 mV to VS − 70 mV (i.e., 4.93 V) across −40°C to +125°C with 10-kΩ load. This rail-to-rail performance ensures >98% of the 0–5 V ADC input range is usable, maximizing dynamic range for precision digitization in server PMBus controllers.

How does the INA4290A3IRGVR handle capacitive loads on its output?

The INA4290A3IRGVR drives up to 500 pF capacitive load without sustained oscillation or isolation resistor requirement. This allows direct connection to SAR ADC inputs and long PCB traces in multi-channel power monitors. Exceeding 500 pF may degrade settling time or cause instability, so layout best practices (short traces, local decoupling) are recommended for robust operation.

Is the thermal pad on the INA4290A3IRGVR package required to be grounded?

No - the thermal pad on the INA4290A3IRGVR (RGV package) may be left electrically floating or connected to GND based on PCB design needs. TI specifies that grounding improves thermal resistance (θJB drops from 21.0°C/W to ~18°C/W), but floating is acceptable if GND routing conflicts with signal integrity. No electrical performance degradation occurs in either configuration.