INA280A3IDCKT

Overview

The INA280A3IDCKT is a high-precision, unidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 100 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 range from 2.7 V to 120 V. Key electrical specifications include a typical DC common-mode rejection ratio (CMRR) of 140 dB, an offset voltage maximum of ±150 µV, and a quiescent current of 370 µA. It provides a bandwidth of 900 kHz at the 100 V/V gain setting.

Feature Summary

• High precision measurement capability with low offset voltage and drift characteristics for accurate sensing across extended temperature ranges.
• Wide common-mode voltage operation supporting high-side current monitoring in systems with large voltage rails up to 120 V.
• Fast transient response and high slew rate designed for rapid detection and processing of overcurrent events.

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 variant during procurement. Confirm that the A3 designation matches the required 100 V/V gain for the target circuit design. Ensure the component meets RoHS compliance requirements if applicable to the manufacturing process. Cross-reference the datasheet revision history to confirm no recent parameter changes affect the application.

Selection Notes

Select this part when a fixed 100 V/V gain is optimal for the signal-to-noise ratio requirements. Consider the 900 kHz bandwidth limitation compared to lower gain variants if higher frequency response is needed. Evaluate the 370 µA quiescent current against strict power budget constraints. Verify that the unidirectional operation aligns with the system's current flow direction.

Part Context

This component belongs to the INA280 family of high-precision current sense amplifiers. The family offers multiple gain options ranging from 20 V/V to 500 V/V within the same SC-70 footprint. The INA280 series is engineered for applications requiring wide common-mode voltage tolerance and high-speed response in compact designs.

Replacement Considerations

Other gains in the INA280 family, such as INA280A2IDCKT or INA280A4IDCKT, share the same package and pinout but differ in fixed gain values. Direct substitution requires adjusting the shunt resistor value to maintain equivalent output voltage levels.

FAQ

Is the INA280A3IDCKT capable of bidirectional current sensing?

No, the INA280A3IDCKT is designed for unidirectional operation only, sensing current flowing from the power supply to the load.

What is the minimum common-mode voltage relative to the supply voltage?

The minimum common-mode voltage is restricted by the supply voltage; it cannot operate below the VS pin voltage under standard conditions.