INA280A3QDCKRQ1

Overview

The INA280A3QDCKRQ1 is a single-channel current sense amplifier from Texas Instruments, qualified under AEC-Q100 standards for automotive applications. It operates with 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 gain bandwidth product of 900 kHz and offers a fixed gain of 50 V/V. Key electrical specifications include a maximum input offset voltage of 15 µV, an input bias current of 20 µA, and a typical common-mode rejection ratio of 140 dB. It consumes 370 µA of operating supply current and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Supports high-side and low-side current sensing with a wide common-mode voltage range extending up to 120 V.
• Provides high accuracy with a fixed gain of 50 V/V and minimal input offset voltage.
• Features ultra-high common-mode rejection ratio for noise immunity in electrically noisy environments.
• Qualified for automotive use with robust performance across extended industrial temperature ranges.

Applications

• Automotive battery management systems
• Electric vehicle powertrain control units
• Industrial motor drives and inverters
• High-voltage DC-DC converter monitoring

Procurement Notes

Verify the complete part number including suffixes to ensure correct package type and tape-and-reel configuration. Confirm AEC-Q100 qualification status if automotive reliability is required. Check datasheet for specific gain error and drift characteristics relevant to your application precision needs. Ensure supply voltage limits are respected during system design to prevent device damage.

Selection Notes

Select this component when high common-mode voltage tolerance is required alongside precise current measurement. The fixed 50 V/V gain suits applications needing moderate signal amplification without external resistors. Consider the 900 kHz bandwidth for dynamic load monitoring. Compare against lower voltage variants if system constraints allow reduced common-mode ranges to optimize cost or performance.

Part Context

This device belongs to the INA280 family of precision current sense amplifiers designed for demanding automotive and industrial environments. It complements other Texas Instruments solutions like the INA185 and INA190 series by offering higher common-mode voltage capability. The SC-70-6 package provides a compact footprint suitable for space-constrained PCB layouts in modern electronic control units.

FAQ

What is the maximum common-mode voltage supported by the INA280A3QDCKRQ1?

The device supports a common-mode voltage range from 2.7 V up to 120 V, allowing it to monitor currents in high-side configurations on buses with significant voltage potential.

Does the INA280A3QDCKRQ1 support bidirectional current sensing?

No, the INA280 is designed for unidirectional current sensing. For bidirectional applications requiring negative current detection, consider devices from the INA181 or INA190 series.

What is the fixed internal gain of this amplifier?

The INA280A3QDCKRQ1 has a fixed internal gain of 50 V/V, which eliminates the need for external precision resistors and simplifies the circuit design.