INA185A3QDCKRQ1

Overview

The INA185A3QDCKRQ1 is a bidirectional current-sense amplifier from Texas Instruments, designed for automotive applications with AEC-Q100 qualification. It features a fixed gain of 100 V/V and supports common-mode voltages ranging from -0.2V to 26V. The device operates on a single supply voltage between 2.7V and 5.5V, drawing a maximum quiescent current of 260µA. Key electrical specifications include a bandwidth of 150kHz, an offset voltage of ±55µV at 12V common-mode, and a maximum gain error of ±0.2%. It is housed in a compact SC-70 (DCK) package.

Feature Summary

• Bidirectional current sensing capability allows measurement of current flow in both directions through a shunt resistor.
• High precision performance with low offset voltage and high common-mode rejection ratio ensures accurate monitoring.
• Wide common-mode input range enables operation in both high-side and low-side configurations independent of supply voltage.
• Integrated matched resistor gain network minimizes gain error and reduces temperature drift.

Applications

• Body Control Modules
• Zonal Control Modules
• ADAS Domain Controllers
• ADAS Sensor Diagnostics

Procurement Notes

Verify the specific suffix 'A3' confirms the 100 V/V gain option during procurement. Ensure the component meets AEC-Q100 Grade 1 requirements for the specified temperature range. Confirm the SC-70 package type matches the design footprint. Validate that the functional safety documentation is available if required for the system design.

Selection Notes

Select this device when a fixed gain of 100 V/V is required for bidirectional current monitoring. Consider the 150kHz bandwidth for applications requiring moderate signal response speeds. Evaluate the 260µA quiescent current against power budget constraints. Ensure the 26V common-mode range aligns with the bus voltage levels of the target application.

Part Context

This component belongs to the INA185-Q1 family of high-precision, bidirectional current-sense amplifiers. The family offers various gain options (20, 50, 100, 200 V/V) denoted by suffixes A1 through A4. All variants share similar electrical characteristics regarding common-mode range, supply voltage, and package type, differing primarily in their internal fixed gain settings.

Replacement Considerations

INA185A1QDCKRQ1

FAQ

What is the maximum common-mode voltage supported by the INA185A3QDCKRQ1?

The device supports a common-mode voltage range from -0.2V to 26V.

How does the REF pin affect the output in bidirectional mode?

Applying a voltage to the REF pin offsets the output voltage, allowing the amplifier to measure positive and negative differential signals relative to this reference level.

Is the INA185A3QDCKRQ1 suitable for high-side current sensing?

Yes, the wide common-mode input range allows the device to be used in both high-side and low-side current-sensing applications.