Texas Instruments INA280A5IDCKR

Overview

INA280A5IDCKR from Texas Instruments is a high-precision, unidirectional current sense amplifier optimized for high-side sensing in 48-V–120-V power rails. It delivers 500 V/V fixed gain, ±150 µV max input offset voltage, 120-dB min DC CMRR, and 800-kHz bandwidth (at 500 V/V), enabling accurate fast overcurrent detection in telecom and server power systems.

For engineers reviewing the INA280A5IDCKR datasheet, INA280A5IDCKR pinout, INA280A5IDCKR application, or INA280A5IDCKR equivalent, this device is selected for high-common-mode, low-drift current monitoring where output swing to rail, thermal stability across −40°C to +125°C, and minimal input bias current (20 µA typ) are critical design requirements.

Technical Context

The INA280A5IDCKR uses a transconductance architecture with current-feedback amplifier topology, enabling operation up to 120 V common-mode while maintaining 20 µA typical input bias current. Its fixed 500 V/V gain is set by an internal precision resistor network (2 kΩ/1000 kΩ), eliminating external gain-setting components and ensuring ±0.5% max gain error.

This variant supports unidirectional sensing only, with minimum common-mode voltage constrained by supply (e.g., ≥2.7 V at VS = 2.7 V). Its 2 V/µs slew rate and <9 µs settling time (to 0.5%) support rapid fault response-critical for protecting RF PAs and 48-V server VRMs against inrush currents.

Key Specifications

Pinout & Package

INA280A5IDCKR is housed in a 5-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm footprint and 0.65-mm lead pitch. The compact size supports high-density placement near shunt resistors in space-constrained RRU and AAS modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA280A5IDCKR, INA293A5IDCKR offers superior offset stability for long-duration measurements, while MAX40086AUB+T trades common-mode range for higher bandwidth in low-supply applications-neither is pin-compatible, and both require layout revision for 48-V+ use cases.

Availability

INA280A5IDCKR is available at Aetrix Electronics and suitable for active antenna systems, macro remote radio units, and 48-V rack servers requiring stable component supply, extended temperature operation, and high common-mode immunity.

Supply support for INA280A5IDCKR 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 signal chain and power management ICs.

The INA280 family was designed specifically for high-accuracy, high-common-mode current sensing in next-generation telecom infrastructure, enterprise servers, and industrial power systems-emphasizing low drift, fast response, and SC-70 space efficiency.

FAQ

What is the maximum common-mode voltage the INA280A5IDCKR can withstand during normal operation?

The INA280A5IDCKR operates with a common-mode input range of 2.7 V to 120 V under recommended conditions. Its absolute maximum survival rating extends to −20 V to +122 V, allowing robust handling of transient overvoltages in 48-V telecom systems without latch-up or damage. This specification is validated across the full −40°C to +125°C temperature range.

Does the INA280A5IDCKR support bidirectional current sensing?

No, the INA280A5IDCKR supports unidirectional current sensing only. Its internal architecture is optimized for high-side sensing where current flows from supply to load. The device cannot accurately measure reverse current or negative differential inputs; attempting to do so results in output saturation or non-linear behavior. For bidirectional applications, TI recommends the INA240 or INA229 families instead.

What is the output voltage swing capability of the INA280A5IDCKR at 5-V supply?

At VS = 5 V, the INA280A5IDCKR output swings from GND + 5 mV (min) to VS − 70 mV (max) into a 10-kΩ load across −40°C to +125°C. This rail-to-rail–capable output ensures >4.9 V usable dynamic range for 500 mV/A scaling, supporting direct interface with 12-bit SAR ADCs without external level-shifting or gain adjustment.

How does the bandwidth of the INA280A5IDCKR compare to lower-gain variants like the INA280A1?

The INA280A5IDCKR has an 800-kHz −3-dB bandwidth (measured at C_L = 5 pF, V_SENSE = 8 mV), which is lower than the 1.1-MHz bandwidth of the INA280A1 (20 V/V) due to gain-bandwidth trade-off inherent in its multistage transconductance design. However, its 800-kHz bandwidth remains sufficient for detecting sub-2-µs overcurrent events in 48-V server VRMs and macro RRUs.

Can the INA280A5IDCKR be used with a 20-V supply voltage?

Yes, the INA280A5IDCKR supports supply voltages from 2.7 V to 20 V per its recommended operating conditions. At VS = 20 V, the output swing extends to GND + 25 mV to VS − 200 mV, providing up to 19.75 V of linear output range-ideal for interfacing with high-voltage ADCs or driving optocoupler inputs in industrial isolation schemes.