INA280A3IDCKR

Overview

The INA280A3IDCKR 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, enabling high-side sensing in demanding environments. Key electrical characteristics include a typical DC common-mode rejection ratio (CMRR) of 140 dB, an input offset voltage of ±150 µV maximum, and a quiescent current of 370 µA. It offers a bandwidth of 900 kHz at the 100 V/V gain setting and a slew rate of 2 V/µs.

Feature Summary

• Supports high-side current sensing with a wide common-mode voltage range up to 120 V.
• Provides high accuracy with low offset voltage and minimal gain drift over temperature.
• Features a compact SC-70 package footprint for space-constrained designs.

Applications

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

Procurement Notes

Verify the specific suffix IDCKR corresponds to the SC-70-5 package and tape-and-reel delivery format. Confirm the A3 designation matches the required 100 V/V gain for your circuit design. Ensure the operating environment stays within the specified -40°C to +125°C temperature range for guaranteed performance parameters.

Selection Notes

Select this component when a fixed 100 V/V gain is optimal for the signal-to-noise ratio requirements. Consider the 900 kHz bandwidth if fast transient response is needed. Evaluate the 370 µA quiescent current against system power budgets. Verify that the 120 V common-mode range exceeds the maximum bus voltage in the application.

Part Context

This part belongs to the INA280 family of high-precision current sense amplifiers. The family includes variants with gains of 20, 50, 200, and 500 V/V. The INA280 series is designed for applications requiring wide common-mode voltage ranges and high bandwidth, distinguishing it from lower-speed or lower-voltage alternatives in the TI portfolio.

Replacement Considerations

Other members of the INA280 family such as INA280A1IDCKR, INA280A2IDCKR, INA280A4IDCKR, and INA280A5IDCKR share the same package and pinout but offer different fixed gains. Substitution requires adjusting the shunt resistor value to maintain equivalent output voltage levels.

FAQ

Is the INA280A3IDCKR capable of bidirectional current sensing?

No, the INA280 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 go below VS under normal operating conditions as defined in the datasheet.