INA186A3IYFDR

Overview

The INA186A3IYFDR is a bidirectional, low-power, zero-drift current-sense amplifier manufactured by Texas Instruments. It features a fixed gain of 100 V/V and operates with a supply voltage range of 1.7 V to 5.5 V. The device supports common-mode voltages from -0.2 V to +40 V independent of the supply. Key electrical specifications include a maximum offset voltage of ±50 µV, a minimum common-mode rejection ratio of 120 dB, and a typical quiescent current of 48 µA. It is housed in a DSBGA-6 package.

Feature Summary

• Bidirectional current sensing capability enabled by an external reference pin for precise measurement across both positive and negative differential input voltages.
• Zero-drift architecture providing low offset voltage and drift to extend dynamic range and allow use of smaller sense resistors.
• Low input bias current design that minimizes power consumption and enables accurate microamp-level current measurements.
• Integrated enable pin that reduces supply current to less than 0.1 µA when disabled, placing the output in a high-impedance state.

Applications

• Standard notebook PC
• Smartphone
• Consumer battery charger
• Baseband unit (BBU)
• Merchant network and server PSU

Procurement Notes

Verify the specific suffix 'YFD' corresponds to the DSBGA-6 package configuration as documented in the datasheet. Confirm the 'A3' designation indicates the fixed 100 V/V gain option. Ensure the component meets RoHS compliance requirements if specified for your manufacturing process. Cross-reference the manufacturer part number with official Texas Instruments documentation to validate authenticity and revision status before procurement.

Selection Notes

Select this component when bidirectional sensing is required within a 40-V common-mode range. The 100 V/V gain suits applications needing higher resolution for small shunt voltages. Consider the DSBGA-6 package for compact board space. Verify that the 35 kHz bandwidth meets system signal frequency requirements. Ensure the enable pin functionality aligns with power management strategies for low-quiescent-current operation.

Part Context

This device belongs to the INA186 family of current-sense amplifiers designed for high-precision, low-power monitoring. The family offers various gain options and packages, including SC70 and SOT-23. The A3 variant specifically provides a 100 V/V gain. The YFD suffix denotes the DSBGA package type which includes an enable pin but lacks a dedicated reference pin, requiring internal grounding of the reference node.

Replacement Considerations

INA186A3IDCKR

FAQ

Does the INA186A3IYFDR support bidirectional current sensing?

Yes, the device supports bidirectional current sensing. However, the YFD package does not have an external REF pin; the reference node is internally connected to ground, which typically configures it for unidirectional sensing unless modified by external circuitry or if the datasheet specifies internal biasing for bidirectional use in this specific package variant.

What is the function of the ENABLE pin on the YFD package?

The ENABLE pin allows the user to turn the device off. When driven to GND, the supply current drops to less than 0.1 µA, and the output enters a high-impedance state. When driven to VS, the device operates normally.

How does the zero-drift architecture benefit current measurement?

The zero-drift architecture provides very low offset voltage and offset drift. This extends the dynamic range of the measurement, allowing for the use of smaller sense resistors with lower power loss while maintaining accuracy, particularly at light loads.