INA280A2QDCKRQ1

Overview

The INA280A2QDCKRQ1 is an automotive-grade, high-precision current sense amplifier manufactured by Texas Instruments. It operates within a supply voltage range of 2.7 V to 20 V and supports common-mode voltages from 2.7 V up to 120 V. The device features a fixed gain of 50 V/V, a bandwidth of 900 kHz, and a maximum gain error of 0.1%. Key electrical specifications include a maximum input offset voltage of 15 µV, a typical quiescent current of 370 µA, and a CMRR of 140 dB. It is housed in a SC-70-5 package and is qualified under AEC-Q100 standards for operation between -40°C and +125°C.

Feature Summary

• Supports bidirectional current sensing with a wide common-mode voltage range extending up to 120 V.
• Delivers high precision with a low maximum gain error of 0.1% and minimal input offset voltage.
• Features a high common-mode rejection ratio (CMRR) of 140 dB for accurate measurements in noisy environments.
• Includes integrated output short-circuit protection to safeguard the device during fault conditions.

Applications

• Automotive battery management systems
• Motor control circuits
• High-side current monitoring in power distribution units

Procurement Notes

Verify that the specific suffix QDCKRQ1 corresponds to the AEC-Q100 qualified automotive grade variant. Confirm the fixed gain setting matches the required application design, as this model provides a fixed 50 V/V gain. Ensure the SC-70-5 package footprint aligns with the PCB layout requirements. Cross-reference the datasheet revision date to ensure compatibility with latest thermal and electrical specifications.

Selection Notes

Select this component when a fixed 50 V/V gain is sufficient for the target signal amplitude. It is suitable for applications requiring high accuracy and wide common-mode voltage support without the need for external gain-setting resistors. Consider the 370 µA quiescent current against system power budgets. Verify that the 900 kHz bandwidth meets the dynamic response requirements of the monitored circuit.

Part Context

This part belongs to the INA280 family of high-voltage, bidirectional current sense amplifiers. It shares the same core architecture and packaging as other variants in the series but differs in its fixed internal gain configuration. The 'Q' suffix indicates automotive qualification, while 'A2' specifies the 50 V/V gain option. It complements higher-gain models like the INA280A3 and INA280A4 within the same product line.

Replacement Considerations

Direct substitutes within the same family include the INA280A2IDCKR for industrial grade applications. For different gain requirements, consider the INA280A3QDCKRQ1 (200 V/V) or INA280A4QDCKRQ1 (100 V/V). Ensure any replacement maintains the SC-70-5 package and AEC-Q100 qualification if automotive reliability is required.