INA185A1QDCKRQ1

Overview

The INA185A1QDCKRQ1 is an AEC-Q100 qualified, bidirectional current sense amplifier designed for automotive applications. It features a fixed gain of 20V/V and supports common-mode voltages from -0.2V to 26V while operating on a single supply voltage between 2.7V and 5.5V. The device offers a bandwidth of 350kHz and a slew rate of 2V/µs. Electrical specifications include a maximum offset voltage of ±135µV at VCM=0V, a maximum quiescent current of 260µA, and a gain error of ±0.2%. It is housed in a SC-70-6 package.

Feature Summary

• Bidirectional current sensing capability with integrated matched resistor gain network
• High bandwidth and fast slew rate for rapid response to input current changes
• Wide common-mode voltage range independent of the power supply voltage
• Rail-to-rail output swing allowing linear operation close to supply rails

Applications

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

Procurement Notes

Verify the specific suffix 'A1' confirms the 20V/V gain option during procurement. Confirm the 'Q1' designation indicates AEC-Q100 qualification for automotive use. Ensure the 'DCK' suffix matches the required SC-70-6 package type. Cross-reference the full part number against the manufacturer's official ordering guide to validate availability and revision status.

Selection Notes

Select this component when a fixed 20V/V gain is required for high-side or low-side current monitoring. The wide common-mode range allows operation with bus voltages up to 26V regardless of the low supply voltage. Consider the 350kHz bandwidth for applications requiring fast fault detection or motor control. Verify that the maximum offset voltage meets the accuracy requirements for the minimum expected load current.

Part Context

This device belongs to the INA185-Q1 family of high-precision current sense amplifiers. It shares the same functional architecture as other gain variants (A2, A3, A4) within the series but is distinguished by its specific 20V/V internal gain setting. The family is designed for cost-sensitive, space-constrained automotive environments requiring robust performance under varying thermal conditions.

Replacement Considerations

Other gain options within the same package, such as INA185A2QDCKRQ1 (50V/V), INA185A3QDCKRQ1 (100V/V), and INA185A4QDCKRQ1 (200V/V), are pin-compatible replacements if the system gain can be adjusted externally or if the sensitivity requirement differs.