INA2191A4IYBJR

Overview

The INA2191A4IYBJR is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It features a gain of 200 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. Key electrical specifications include a maximum gain error of ±0.25%, a typical input bias current of 100 pA, and a maximum offset voltage of ±12 μV. Quiescent current is 96 μA (typical) at 1.8 V supply. It is housed in a 12-pin DSBGA package.

Feature Summary

• Bidirectional current sensing capability enabled by external reference pins for each channel
• Ultra-low input bias current allows accurate measurement of microamp-level currents
• High accuracy with low gain error and minimal offset voltage drift over temperature
• Integrated enable function reduces supply current to nanoamp levels when disabled

Applications

• Battery-powered devices
• Notebook computers
• Power management systems
• Telecom equipment

Procurement Notes

Verify the complete part number against the manufacturer's official ordering information to ensure correct gain, package, and tape-and-reel specifications. Confirm that the A4 suffix corresponds to the required 200 V/V gain. Check for any specific environmental or reliability certifications required for your application before finalizing procurement.

Selection Notes

Select this component when bidirectional current monitoring is required alongside high precision. The 200 V/V gain suits applications with small sense resistor voltage drops. Ensure the system can provide an appropriate reference voltage on the REF pins for bidirectional operation. Verify that the 40 V common-mode range meets the bus voltage requirements of the target circuit.

Part Context

This device belongs to the INAx191 family of ultra-precise current sense amplifiers. The INA2191 variant specifically adds a second channel and bidirectional sensing capabilities compared to the single-channel INA191. Both share the same low-power architecture and high-accuracy specifications, making them suitable for space-constrained portable electronics.

Replacement Considerations

Direct substitutes within the same family include other gain options of the INA2191 (e.g., INA2191A2, INA2191A3, INA2191A5) if different sensitivity is needed. For unidirectional applications, the INA191 series may be considered. Always verify pin compatibility and functional equivalence with the manufacturer's cross-reference tools.