INA2191A3IYBJR

Overview

The INA2191A3IYBJR is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 100 V/V and operates with a supply voltage between 1.7 V and 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%, an input bias current of 3 nA, and a quiescent current of 96 µA. It utilizes a DSBGA-12 package.

Feature Summary

• Dual-channel architecture enabling independent bidirectional current sensing for two separate circuits within a single component.
• Ultra-low input bias current capability allows for the use of larger sense resistors while maintaining microamp-level measurement accuracy.
• Zero-drift architecture provides high precision through low offset voltage and minimal drift over temperature variations.
• Integrated enable pins allow for individual channel control, reducing power consumption when channels are not in use.

Applications

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

Procurement Notes

Verify the specific suffix 'A3' confirms the 100 V/V gain option and 'YBJR' indicates the DSBGA-12 package with reel packaging. Confirm the manufacturer is Texas Instruments. Ensure the datasheet revision matches production data requirements. Check RoHS compliance status if required by your manufacturing standards.

Selection Notes

Select this component when dual-channel bidirectional monitoring is required in space-constrained designs. The 100 V/V gain suits applications requiring moderate amplification of shunt voltages. The wide common-mode range up to 40 V allows high-side sensing on standard bus voltages. Consider the DSBGA-12 footprint constraints during PCB layout.

Part Context

This part belongs to the INAx191 family of ultra-precise current sense amplifiers. Unlike the single-channel INA191, the INA2191 integrates two independent channels in a compact 12-pin DSBGA package. The A3 designation specifically sets the internal gain to 100 V/V, distinguishing it from other variants offering gains of 25, 50, 200, or 500 V/V.

Replacement Considerations

INA2191A2IYBJR (50 V/V gain), INA2191A4IYBJR (200 V/V gain). Verify pin compatibility and gain requirements before substitution.

FAQ

How does the INA2191 achieve bidirectional sensing?

It uses external reference pins (REF1 and REF2) where applying a voltage allows the output to swing above or below that reference level, indicating current direction.

What is the maximum common-mode voltage supported?

The device can sense currents at common-mode voltages ranging from -0.2 V to +40 V, independent of the supply voltage.