Texas Instruments INA290A2IDCKT

Overview

INA290A2IDCKT 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, and 1.1 MHz bandwidth at 50 V/V. It delivers ultra-precise DC and transient current measurement in 48-V server power rails and remote radio units.

For engineers reviewing the INA290A2IDCKT datasheet, INA290A2IDCKT pinout, INA290A2IDCKT application, or INA290A2IDCKT equivalent, this device supports fast overcurrent protection, low-shunt-resistor sensing down to millivolt-level VSENSE, and operation across –40°C to +125°C with <0.1% gain error and 160-dB DC CMRR.

Technical Context

The INA290A2IDCKT 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 ensures stable offset performance across temperature.

This A2 variant is optimized for 50 V/V gain, delivering 1.1 MHz bandwidth with 2 V/µs slew rate and 85-dB AC CMRR at 50 kHz - supporting both precision DC monitoring and high-speed fault detection in 48-V and 120-V systems.

Key Specifications

Pinout & Package

The INA290A2IDCKT is housed in a 5-pin SC-70 package (2.00 mm × 1.25 mm), optimized for space-constrained high-voltage PCB layouts. Thermal pad is optional and may be left floating or connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA282A2IDR and MAX4008AUA+, the INA290A2IDCKT uniquely combines 120-V common-mode capability, ±12 µV offset, and 1.1 MHz bandwidth in a 5-pin SC-70 package - making it the only option qualified for precision 48-V/120-V high-side sensing with sub-µV/°C drift.

Availability

INA290A2IDCKT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) protection, and active antenna system (mMIMO) current profiling requiring stable component supply and long-term production continuity.

Supply support for INA290A2IDCKT 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-voltage current sensing in next-generation telecom infrastructure, server power, and industrial power conversion - emphasizing zero-drift stability, wide common-mode operation, and fast transient response.

FAQ

What is the maximum common-mode voltage the INA290A2IDCKT can withstand?

The INA290A2IDCKT 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 high-side sensing on 48-V and 120-V bus rails without external level-shifting circuitry, and provides robustness against voltage transients in telecom and industrial environments. The INA290A2IDCKT maintains specified performance across its full 2.7–120 V operating range.

Does the INA290A2IDCKT support bidirectional current sensing?

No, the INA290A2IDCKT is a high-side-only current-sense amplifier with unidirectional output polarity. Its architecture is optimized for sensing current flowing from supply to load, and the output voltage increases with positive differential input (IN+ > IN−). For bidirectional applications, TI recommends the INA229 or INA240 families. The INA290A2IDCKT does not support negative VSENSE or reverse-current indication.

What is the recommended shunt resistor value for use with the INA290A2IDCKT at 50 V/V gain?

For optimal SNR and headroom, a 5-mΩ shunt yields 250 mV output at 5 A - well within the 1.1 MHz bandwidth and rail-to-rail output swing (GND + 25 mV to VS − 200 mV). At 50 V/V gain, the INA290A2IDCKT supports full-scale VSENSE up to 20 mV (i.e., 4 A through 5-mΩ), preserving accuracy while minimizing I²R loss. The ±12 µV offset allows resolution down to ~240 mA with this shunt.

Can the INA290A2IDCKT drive a 10-kΩ load directly?

Yes, the INA290A2IDCKT is fully specified to drive a 10-kΩ resistive load across –40°C to +125°C, with guaranteed output swing of VS − 0.2 V and GND + 0.025 V. Its output stage delivers sufficient current (≥20 mA short-circuit) and maintains 1.1 MHz bandwidth into this load. No external buffer is required for standard ADC interfacing or microcontroller inputs with ≥10-kΩ impedance.

Is the INA290A2IDCKT pin-compatible with other variants in the INAx290 family?

Yes, all single-channel INAx290 devices - including INA290A1, INA290A2, INA290A3, INA290A4, and INA290A5 - share identical SC-70 (DCK) 5-pin pinout and footprint. Gain is set internally and cannot be modified externally; swapping variants requires only a bill-of-materials update, with no PCB layout change needed. The INA290A2IDCKT retains full functional compatibility with other A# variants in the same package.