Texas Instruments INA290A4IDCKT

Overview

INA290A4IDCKT from Texas Instruments is a single-channel, high-side current-sense amplifier with 200 V/V fixed gain, 2.7–120 V common-mode input range, ±12 µV max offset voltage, and 850 kHz bandwidth (at 20 mV V_SENSE). It delivers ultra-precise DC and transient current measurement in 48-V server power rails and telecom remote radio units.

For engineers reviewing the INA290A4IDCKT datasheet, INA290A4IDCKT pinout, INA290A4IDCKT application, or INA290A4IDCKT equivalent, this device supports fast overcurrent protection, low-shunt-loss sensing down to millivolt-level V_SENSE, and operation across –40°C to +125°C without calibration drift.

Technical Context

The INA290A4IDCKT 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 achieves ±0.2 µV/°C offset drift and 160 dB DC CMRR - critical for rejecting bus noise in high-voltage power systems.

This A4 variant is optimized for 200 V/V gain, delivering 850 kHz bandwidth at 20 mV differential input while maintaining <±0.15% gain error and 2 V/µs slew rate. The SC-70 package supports space-constrained PCB layouts in multi-rail 48-V infrastructure where thermal resistance (R_θJA = 191.6 °C/W) and low quiescent current (370–600 µA) are essential.

Key Specifications

Pinout & Package

INA290A4IDCKT is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for high-density power management layouts with minimal board area and thermal mass.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A4IDR and MAX40056ASA+, the INA290A4IDCKT uniquely combines 120-V common-mode tolerance, 160 dB DC CMRR, and ±12 µV offset in a 2.0 mm × 1.25 mm SC-70 footprint - making it optimal for space- and precision-constrained 48-V telecom and datacenter power rails.

Availability

INA290A4IDCKT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current sensing, and active antenna system (AAS) feedback requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA290A4IDCKT 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 infrastructure - targeting telecom, datacenter, and industrial power systems demanding µV-level offset stability and 120-V survivability.

FAQ

What is the maximum common-mode voltage the INA290A4IDCKT can withstand?

The INA290A4IDCKT 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 with margin for transients, making it suitable for telecom and server power applications where voltage spikes exceed nominal levels. The device remains functional within its specified operating range as long as VS ≥ 2.7 V and V_CM stays within limits defined in the absolute maximum ratings table of the INA290A4IDCKT datasheet.

Does the INA290A4IDCKT support bidirectional current sensing?

No, the INA290A4IDCKT is a high-side-only current-sense amplifier and does not support bidirectional sensing. Its input architecture requires V_CM ≥ VS − 0.3 V, restricting operation to unidirectional, high-side configurations where the shunt is placed between the supply and load. For bidirectional applications, TI recommends alternatives like the INA240 series. The INA290A4IDCKT datasheet explicitly states "topology restricts operation to high-side, current-sensing applications."

What is the typical quiescent current of the INA290A4IDCKT across temperature?

The INA290A4IDCKT draws 370 µA typical quiescent current at 25°C, rising to 600 µA maximum across –40°C to +125°C. This low and stable supply current enables integration into always-on telemetry circuits without compromising system efficiency. Measured data in Figure 6-31 of the INA290A4IDCKT datasheet confirms monotonic increase with temperature, with no abrupt shifts - ensuring predictable power budgeting in thermally varied environments like outdoor RRUs.

Can the INA290A4IDCKT drive a 10-kΩ load while maintaining rail-to-rail output swing?

Yes, the INA290A4IDCKT guarantees output swing to within 70 mV of VS and 25 mV above GND when driving a 10-kΩ load across –40°C to +125°C. This rail-to-rail capability ensures full utilization of ADC input ranges and eliminates need for external level-shifting. The specification is validated under load conditions matching typical SAR ADC input impedance and is documented in Section 6.5 "Electrical Characteristics" of the INA290A4IDCKT datasheet.

How does the 200 V/V gain option of the INA290A4IDCKT affect bandwidth and noise performance?

The INA290A4IDCKT's 200 V/V gain yields 850 kHz bandwidth (at 20 mV V_SENSE) and 50 nV/√Hz input-referred voltage noise. Higher gain reduces bandwidth versus lower-gain variants (e.g., 1100 kHz for A1), but maintains sufficient speed for overcurrent protection in 48-V systems. Noise remains consistent across gain options because it originates from the input stage, not the gain-setting resistors - confirmed in Figure 6-26 of the INA290A4IDCKT datasheet.