Texas Instruments INA280A3IDCKT

Overview

INA280A3IDCKT from Texas Instruments is a unidirectional, high-side current sense amplifier with 100 V/V fixed gain, 2.7–120 V common-mode input range, ±150 µV max offset voltage, ±0.5% max gain error, and 900 kHz bandwidth (at 100 V/V). It enables precision DC and fast transient current monitoring in 48-V server power rails and RF power amplifier bias control.

For engineers reviewing the INA280A3IDCKT datasheet, INA280A3IDCKT pinout, INA280A3IDCKT application, or INA280A3IDCKT equivalent, this page delivers verified specifications, SC-70 package layout, real-world use cases in telecom and datacenter power systems, and two validated alternative parts for design flexibility.

Technical Context

The INA280A3IDCKT uses a transconductance architecture with current-feedback amplifier topology to achieve 20 µA typical input bias current and 120 dB minimum DC CMRR - critical for rejecting noise in high-voltage, high-noise environments like macro RRUs. Its unidirectional operation restricts sensing to current flow from supply to load only.

It operates from a single 2.7–20 V supply, draws 370 µA quiescent current, and delivers rail-to-rail output swing (VS – 0.2 V min, GND + 25 mV max) across −40°C to +125°C. Bandwidth drops to 900 kHz at 100 V/V gain due to internal compensation, supporting sub-2 µs overcurrent response on 2-mΩ shunts.

Key Specifications

Pinout & Package

INA280A3IDCKT is housed in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm, optimized for space-constrained PCB layouts in telecom and server applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA280A3IDCKT, INA293A3IDCKT offers tighter offset performance in the same footprint for precision DC monitoring, while MAX40056ATA+T trades offset for higher bandwidth and requires layout revision - making the INA280A3IDCKT optimal for balanced speed, accuracy, and drop-in manufacturability in telecom and server power.

Availability

INA280A3IDCKT 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 traceable sourcing.

Supply support for INA280A3IDCKT 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, embedded processing, and connectivity technologies, with decades of expertise in precision signal conditioning.

The INA280 family was designed specifically for high-voltage, high-accuracy current sensing in next-generation telecom infrastructure and datacenter power systems - emphasizing low drift, high CMRR, and SC-70 miniaturization.

FAQ

What is the maximum common-mode voltage the INA280A3IDCKT can withstand during normal operation?

The INA280A3IDCKT supports a recommended operating common-mode input range of 2.7 V to 120 V. Its survival rating extends to −20 V to +122 V, but continuous operation above 120 V or below 2.7 V is outside specification limits and may impair accuracy or reliability. Always maintain VS ≥ 2.7 V and ensure V_CM stays within the 2.7–120 V window for guaranteed performance in INA280A3IDCKT designs.

Does the INA280A3IDCKT support bidirectional current sensing?

No, the INA280A3IDCKT is strictly unidirectional and designed only for high-side current sensing - it measures current flowing from supply to load. The internal architecture does not support negative differential inputs or reverse current detection. For bidirectional applications, consider TI's INA229 or similar devices; the INA280A3IDCKT must be used with polarity-aware system design.

What is the output voltage swing capability of the INA280A3IDCKT at 125°C ambient temperature?

At 125°C, the INA280A3IDCKT output swings from a minimum of GND + 25 mV to a maximum of VS − 0.2 V (with 10-kΩ load), as specified across the full −40°C to +125°C operating range. This rail-to-rail behavior remains stable over temperature, enabling consistent interface with 12-bit or higher ADCs without external level-shifting in INA280A3IDCKT-based monitoring circuits.

Can the INA280A3IDCKT be used with a 3.3-V supply voltage?

Yes, the INA280A3IDCKT operates with a supply voltage from 2.7 V to 20 V, so 3.3 V is fully supported. At 3.3 V, its output swing is limited to GND + 25 mV to 3.1 V, and bandwidth remains 900 kHz. Ensure the shunt-derived signal scaled by 100× stays within this window - e.g., max V_SENSE = 30.5 mV - to avoid clipping in INA280A3IDCKT implementations.

How does the 900 kHz bandwidth of the INA280A3IDCKT compare to the 1.1 MHz bandwidth of the INA280A1 variant?

The INA280A3IDCKT's 900 kHz bandwidth reflects gain-dependent compensation: higher gain (100 V/V) reduces bandwidth versus lower-gain variants (e.g., 1.1 MHz at 20 V/V). This trade-off preserves stability and settling time while still enabling <2 µs overcurrent response on typical shunts. The bandwidth is measured at C_LOAD = 5 pF and V_SENSE = 40 mV, per INA280A3IDCKT's electrical characteristics table.