INA186A4QDCKRQ1

Overview

The INA186A4QDCKRQ1 is a bidirectional, low-power, voltage-output current sense amplifier from Texas Instruments. It operates with a supply voltage range of 1.7 V to 5.5 V and consumes only 90 µA of quiescent current. The device features a fixed gain of 200 V/V and supports common-mode voltages from -200 mV to +40 V, independent of the supply voltage. Key electrical specifications include a maximum input offset voltage of 3 µV, an input bias current of 500 pA, and a gain error of 0.04%. It provides a common-mode rejection ratio (CMRR) of 150 dB and has a bandwidth of 33 kHz. The component is packaged in a five-pin SOT-23 case and is qualified under AEC-Q100 standards for automotive applications.

Feature Summary

• Zero-drift architecture ensures high precision by minimizing offset voltage drift over temperature variations.
• Bidirectional operation allows accurate detection of both sourcing and sinking currents across the shunt resistor.
• High common-mode voltage tolerance enables direct monitoring of high-side or low-side loads without level shifting.

Applications

• Overcurrent protection circuits in automotive systems
• Precision current measurement for battery management systems
• Closed-loop feedback control in motor drivers

Procurement Notes

Verify that the specific suffix QDCKRQ1 corresponds to the SOT-23-5 package and AEC-Q100 automotive qualification. Confirm the fixed gain setting matches the design requirement for 200 V/V amplification. Ensure the operating environment stays within the specified -40°C to +125°C temperature range. Check datasheet limits for common-mode voltage excursions relative to the supply rail.

Selection Notes

Select this component when ultra-low input bias current is critical for minimizing errors with high-value shunt resistors. The zero-drift technology makes it suitable for applications requiring high accuracy over wide temperature ranges. Compare power consumption against other series if battery life is a primary constraint. Verify that the 33 kHz bandwidth meets the signal frequency requirements of the target application.

Part Context

This part belongs to the INA186 family of current sense amplifiers designed for high-precision measurements. The 'Q1' suffix indicates compliance with automotive reliability standards. It serves as a specialized solution for detecting small voltage drops across shunt resistors in demanding industrial and automotive environments where stability and low power are essential.

Replacement Considerations

Consider the INA186A3QDCKRQ1 for a gain of 100 V/V or the INA186A5QDCKRQ1 for a gain of 500 V/V while maintaining identical pinouts and performance characteristics. Other members of the INA186 series offer different gain options but share similar architectural features.