Texas Instruments INA290A4IDCKR

Overview

INA290A4IDCKR from Texas Instruments is a single-channel, high-side current-sense amplifier with 200 V/V fixed gain, 2.7 V to 120 V common-mode input range, ±12 µV max offset voltage, and 850 kHz bandwidth (at 20 mV V_SENSE). It enables precision shunt-based current monitoring in 48-V server power rails and telecom RRU systems where low drift and high CMRR are critical.

For engineers reviewing the INA290A4IDCKR datasheet, INA290A4IDCKR pinout, INA290A4IDCKR application, or INA290A4IDCKR equivalent, this page delivers verified specifications, SC-70 package layout, real-world use cases in 48-V infrastructure, and two validated alternative parts with documented functional trade-offs.

Technical Context

The INA290A4IDCKR uses a transconductance architecture with current-feedback amplification to achieve 20 µA typical input bias current and operation up to 120 V common-mode - strictly limited to high-side sensing. Its zero-drift topology ensures ±0.2 µV/°C offset drift and ±5 ppm/°C gain drift across −40°C to +125°C.

It delivers 850 kHz small-signal bandwidth at 200 V/V gain with 2 V/µs slew rate and supports output swing within 70 mV of VS and 25 mV of GND under 10-kΩ load. The device draws only 370 µA quiescent current per channel from a 2.7–20 V supply.

Key Specifications

Pinout & Package

INA290A4IDCKR is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained 48-V power modules and remote radio units.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA290A4IDCKR, INA240A4DR trades 120-V survivability and 850-kHz bandwidth for bidirectional sensing and higher fault tolerance at negative voltages, while MAX40088ASA+T offers comparable voltage range at reduced precision and CMRR - making INA290A4IDCKR optimal for high-fidelity 48-V infrastructure monitoring where accuracy and speed are non-negotiable.

Availability

INA290A4IDCKR 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) bias control requiring stable component supply across multi-year production cycles.

Supply support for INA290A4IDCKR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The INA290 family was designed specifically for ultra-precise, high-voltage, high-bandwidth current sensing in next-generation 48-V power architectures - targeting telecom infrastructure, data center servers, and active antenna systems.

FAQ

What is the maximum common-mode voltage the INA290A4IDCKR can survive?

The INA290A4IDCKR has a survival rating of −20 V to +122 V, meaning it withstands transient overvoltages up to +122 V without damage. Its operational common-mode range is 2.7 V to 120 V, enabling reliable use in 48-V and 54-V telecom power systems where bus overshoots occur. This rating is confirmed in Section 6.1 Absolute Maximum Ratings of the SBOS961C datasheet.

Does the INA290A4IDCKR support bidirectional current sensing?

No, the INA290A4IDCKR is a high-side-only current-sense amplifier with unidirectional topology. Its input structure requires V_IN+ ≥ V_IN− and cannot accurately measure reverse current flow. For bidirectional applications, TI recommends the INA240 series. The INA290A4IDCKR datasheet explicitly states "topology restricts operation to high-side, current-sensing applications" in Section 7.1 Overview.

What is the minimum shunt resistance usable with INA290A4IDCKR at full accuracy?

With ±12 µV max offset and 200 V/V gain, the INA290A4IDCKR resolves down to 60 nV of differential input - supporting accurate measurement across a 0.3-mΩ shunt at 200 mA. At 125°C, offset drift adds ±0.2 µV/°C × 165°C = ±33 µV worst-case, limiting practical minimum shunt to ~0.5 mΩ for <1% error in industrial environments.

Can INA290A4IDCKR drive a 100-pF capacitive load directly?

No - the INA290A4IDCKR specifies a maximum stable capacitive load of 500 pF *only when no isolation resistor is used*, but recommends limiting C_LOAD to ≤5 pF for full bandwidth (850 kHz) performance. Driving 100-pF loads directly causes peaking and potential instability; a 10-Ω series resistor between OUT and the load is required per Section 8.2 Typical Application guidance.

Is the gain of INA290A4IDCKR adjustable via external resistors?

No - the INA290A4IDCKR uses a precision internal resistor network to set its fixed 200 V/V gain. TI explicitly warns against adding external resistors to modify gain because "the absolute values [of internal resistors] can vary significantly," which would degrade accuracy. Gain selection is done at manufacture; A4 denotes the 200 V/V variant per Table 1 in the SBOS961C datasheet.