INA280A4IDCKT

Overview

The INA280A4IDCKT is a high-precision, unidirectional current-sense amplifier manufactured by Texas Instruments. It features a fixed gain of 200 V/V and operates with a supply voltage range of 2.7 V to 20 V. The device supports a wide common-mode input voltage from 2.7 V to 120 V, with a survival voltage up to +122 V. Key electrical characteristics include a typical DC common-mode rejection ratio (CMRR) of 140 dB, an offset voltage of ±150 µV maximum, and a quiescent current of 370 µA. It offers a bandwidth of 850 kHz at the 200 V/V gain setting and a slew rate of 2 V/µs.

Feature Summary

• High precision measurement capability enabled by low offset voltage and drift specifications across extended temperature ranges.
• Wide common-mode voltage operation allows sensing on high-side rails up to 120 V while maintaining excellent CMRR.
• Fast transient response suitable for rapid overcurrent detection and protection in dynamic power systems.

Applications

• Active antenna system mMIMO
• Macro remote radio unit (RRU)
• 48-V rack server power supplies
• Test and measurement equipment

Procurement Notes

Verify the specific suffix IDCKT corresponds to the SC-70 package and tape-and-reel shipping configuration. Confirm that the A4 designation matches the required 200 V/V gain for your circuit design. Ensure the operating environment stays within the specified -40°C to +125°C temperature range for guaranteed accuracy parameters.

Selection Notes

Select this component when a fixed 200 V/V gain is optimal for maximizing ADC resolution from small shunt voltages. The high common-mode range makes it suitable for 48 V or higher bus architectures. Consider the 850 kHz bandwidth sufficient for most standard protection loops, but verify settling time requirements against your specific load dynamics.

Part Context

This part belongs to the INA280 family of high-precision current sense amplifiers. Unlike bidirectional variants, the INA280 is designed strictly for unidirectional current flow from supply to load. The A4 variant specifically provides a 200 V/V gain, distinguishing it from other family members like the A1 (20 V/V) or A5 (500 V/V).

Replacement Considerations

Direct functional replacements within the same family include INA280A1IDCKT, INA280A2IDCKT, INA280A3IDCKT, and INA280A5IDCKT, which share identical pinouts and packages but offer different fixed gains.

FAQ

Is the INA280A4IDCKT capable of bidirectional current sensing?

No, the INA280 series is designed exclusively for unidirectional current sensing, measuring current flowing from the power supply to the load.

What is the minimum differential input voltage required to keep the output in the linear region?

To ensure linear operation, the differential input voltage should be at least 25 mV divided by the gain. For the A4 variant (200 V/V), this is approximately 125 µV.