Texas Instruments INA280A4IDCKR

Overview

INA280A4IDCKR from Texas Instruments is a unidirectional, high-side current sense amplifier in SC-70 (5-pin) package, delivering 200 V/V fixed gain, ±0.5% max gain error, ±150 µV max input offset voltage, and 850 kHz bandwidth at 20 mV input signal - enabling precise, fast overcurrent detection in 48-V server power rails and RF power amplifiers.

For engineers reviewing the INA280A4IDCKR datasheet, INA280A4IDCKR pinout, INA280A4IDCKR application, or INA280A4IDCKR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.

Technical Context

The INA280A4IDCKR uses a transconductance architecture with current-feedback amplifier topology, supporting only high-side sensing with common-mode input range from 2.7 V to 120 V and survival up to −20 V to +122 V. Its 120 dB minimum DC CMRR and 85 dB AC CMRR at 50 kHz ensure accuracy under noisy rail conditions.

It operates from a single 2.7–20 V supply, draws 370 µA typical quiescent current, and delivers 2 V/µs slew rate with output swing to within 70 mV of VS and 5 mV of GND at 10 kΩ load - critical for fast transient response in 48-V telecom and server protection circuits.

Key Specifications

Pinout & Package

INA280A4IDCKR is housed in a space-constrained SC-70 (DCK) 5-pin package with 2.0 mm × 1.25 mm body size and 0.65 mm pitch - optimized for high-density 48-V server PCB layouts and mmWave AAS modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sensing applications.

Compared with INA293A4IDBVR and MAX40056AUB+T, the INA280A4IDCKR offers superior DC accuracy (±150 µV vs ±500 µV offset), lower power (370 µA vs 700 µA), and smaller SC-70 footprint - making it optimal for space- and power-constrained 48-V telecom and server applications demanding <0.5% gain error.

Availability

INA280A4IDCKR is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, active antenna systems, test equipment, and high-speed overcurrent protection circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA280A4IDCKR 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 and power management ICs.

The INA280 product line was designed specifically for high-accuracy, high-bandwidth current sensing in next-generation 48-V datacenter, telecom, and industrial power systems - emphasizing small footprint, wide common-mode range, and minimal calibration burden.

FAQ

What is the maximum common-mode voltage the INA280A4IDCKR can handle during normal operation?

The INA280A4IDCKR supports an operational common-mode input voltage range of 2.7 V to 120 V. It also withstands survival voltages from −20 V to +122 V without damage. This allows direct high-side sensing on 48-V, 54-V, and 110-V rails in telecom and server applications without external level-shifting circuitry. The device remains functional across its full temperature range of −40°C to +125°C within these limits.

Does the INA280A4IDCKR support bidirectional current sensing?

No, the INA280A4IDCKR is strictly a unidirectional current sense amplifier designed for high-side sensing only. Its internal transconductance architecture and pin configuration (IN+ and IN− referenced to load-side and supply-side of shunt, respectively) do not support reverse current flow detection. For bidirectional applications, TI recommends the INA229 or similar devices explicitly specified for bidirectional operation.

What is the bandwidth of the INA280A4IDCKR at full-scale output?

The INA280A4IDCKR has a bandwidth of 850 kHz when driven with a 20 mV differential input signal (corresponding to 10-A current on a 2-mΩ shunt at 200 V/V gain). Bandwidth decreases slightly with lower input amplitudes due to gain-dependent frequency response - e.g., it drops to ~700 kHz at 10 mV input. This performance is verified per TI's SBOSA19 datasheet Figure 6-3 and Table 6-5.

Can the INA280A4IDCKR be used with a 3.3-V supply?

Yes, the INA280A4IDCKR operates from a single supply ranging from 2.7 V to 20 V, fully including 3.3 V. At 3.3 V, its output swings to within 70 mV of VS (i.e., up to 3.23 V) and to within 5 mV of GND. This allows direct interfacing with 3.3-V SAR ADCs or microcontrollers. Quiescent current remains stable at ~370 µA, and all key specs - including gain error and offset - are guaranteed across the full supply range.

Is external filtering required or recommended on the IN+ and IN− pins of the INA280A4IDCKR?

No - external filtering on the IN+ and IN− pins is not required and is actively discouraged in the TI datasheet. Adding series resistance degrades CMRR and introduces gain error via mismatched voltage drops; even 10 Ω adds measurable error (e.g., −0.5% for INA280A4). If filtering is needed, TI recommends placing it at the OUT pin instead, where it does not affect accuracy or common-mode rejection. Input RC filters should only be used if absolutely necessary and carefully modeled using Equation 4 and Table 8-2 from SBOSA19.