Texas Instruments INA280A1IDCKT

Overview

INA280A1IDCKT from Texas Instruments is a unidirectional, high-side current sense amplifier in SC-70 package, delivering 20 V/V fixed gain, ±0.5% max gain error, ±150 µV max input offset voltage, and 1.1 MHz bandwidth at 20 V/V. It operates from 2.7 V to 20 V supply and supports common-mode voltages up to 120 V - ideal for precision 48-V server power rail monitoring.

For engineers reviewing the INA280A1IDCKT datasheet, INA280A1IDCKT pinout, INA280A1IDCKT application, or INA280A1IDCKT equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in telecom and server power, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The INA280A1IDCKT uses a transconductance architecture with current-feedback amplifier topology, enabling low input bias current (20 µA typical) and high common-mode rejection (120 dB DC min, 85 dB AC at 50 kHz). Its internal precision resistor network fixes gain at 20 V/V without external components.

It is strictly high-side only and unidirectional - designed to measure current sourced from supply to load - with output swing limited to GND + 25 mV (min) and VS – 0.2 V (max) under full temperature range (–40°C to +125°C).

Key Specifications

Pinout & Package

INA280A1IDCKT is housed in a 5-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size and 0.65-mm pin pitch. The compact footprint (2.0 mm × 2.1 mm PCB area) suits space-constrained RF PA and server VRM layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA280A1IDCKT, INA282A1IDCKT offers tighter offset at minor IQ cost and identical form factor, while MAX40056ASA+T provides higher speed but demands dual supply and larger board area - making INA280A1IDCKT optimal for space- and supply-constrained 48-V high-side monitoring.

Availability

INA280A1IDCKT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current protection, and active antenna system (AAS) per-channel sensing requiring stable component supply across multi-year production cycles.

Supply support for INA280A1IDCKT 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 company specializing in analog and embedded processing solutions, with leadership in precision amplifiers, power management, and signal chain ICs.

The INA280 family was designed specifically for high-accuracy, high-bandwidth current sensing in telecom infrastructure and enterprise power systems - targeting 48-V and higher bus architectures where space, accuracy, and transient response are critical.

FAQ

What is the maximum common-mode voltage the INA280A1IDCKT can withstand?

The INA280A1IDCKT 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, 54-V, and even 110-V industrial rails without external attenuation or level-shifting circuitry. The device remains functional across its full −40°C to +125°C temperature range within these limits.

Does the INA280A1IDCKT support bidirectional current sensing?

No, the INA280A1IDCKT is strictly unidirectional and optimized for high-side current sensing only. It measures current flowing from supply to load and cannot accurately resolve reverse current flow. Its internal architecture does not support negative differential input voltages beyond ±30 V, and the output does not swing below GND + 25 mV - confirming its design for one-quadrant operation.

What is the output voltage swing capability of the INA280A1IDCKT?

The INA280A1IDCKT output swings from GND + 0.005 V (typical) to VS − 0.07 V (typical) at room temperature with 10-kΩ load, degrading to GND + 0.025 V and VS − 0.2 V across −40°C to +125°C. This rail-to-rail output capability ensures full utilization of ADC input range when paired with 5-V or 3.3-V microcontrollers in server and RRU applications.

Can the INA280A1IDCKT be used with a 3.3-V supply?

Yes, the INA280A1IDCKT operates from 2.7 V to 20 V supply, so 3.3 V is fully supported. At 3.3 V, the output swing is limited to approximately GND + 25 mV to 3.23 V, and bandwidth remains 1.1 MHz. Quiescent current stays near 370 µA, making it suitable for low-voltage, low-power monitoring nodes in distributed AAS architectures.

How does the INA280A1IDCKT handle input filtering requirements?

The INA280A1IDCKT does not require input filtering for basic operation and TI explicitly advises against adding series resistance on IN+ or IN− pins - as even 10 Ω introduces measurable gain error (−0.34% for A1 variant). If filtering is needed, TI recommends placing RC networks at the OUT pin instead, preserving accuracy while maintaining low output impedance for downstream stages.