INA199A3RSWR

Current Regulation/Management Overview

The INA199A3RSWR is a single-channel, bidirectional current sense amplifier from the Texas Instruments INA199 series. It features a fixed gain of 200 V/V and operates within a supply voltage range of 2.7 V to 26 V. The device supports a common-mode voltage up to 12 V and offers high precision with a maximum gain error of 0.03% and an input offset voltage of 5 µV. Key electrical parameters include a gain-bandwidth product of 14 kHz, a common-mode rejection ratio of 120 dB, and a quiescent current of 115 µA. It is housed in a 10-UQFN package and functions as a low-side/high-side current sense amplifier.

Current Regulation/Management Feature Summary

• Zero-drift architecture ensures minimal offset voltage drift over temperature variations
• Bidirectional sensing capability allows detection of current flow in both directions
• High accuracy with specified gain error of 0.03% for precise measurement applications

Current Regulation/Management Applications

• Battery management systems requiring high-precision current monitoring
• Industrial process control loops with bidirectional power flow
• Overcurrent protection circuits in portable devices

Current Regulation/Management Procurement Notes

Verify the specific suffix 'A3' confirms the 200 V/V gain setting, as other suffixes indicate different gains. Confirm the 'R' suffix corresponds to the reel packaging format required for automated assembly. Ensure the 'WR' designation matches the UQFN-10 package variant. Cross-reference the manufacturer part number against the latest datasheet revision to confirm pinout and electrical specifications remain unchanged.

Current Regulation/Management Selection Notes

Select this component when a fixed 200 V/V gain is required for high-resolution current sensing. The zero-drift technology makes it suitable for applications demanding stability across wide temperature ranges. Consider the 12 V common-mode limit when designing high-side configurations. The 115 µA quiescent current is appropriate for battery-powered systems where moderate power consumption is acceptable compared to lower-current alternatives.

Current Regulation/Management Part Context

This device belongs to the INA199 family of zero-drift current sense amplifiers. It shares the same package and basic topology with variants like the INA199A2RSWR (100 V/V gain) and INA199B3RSWR (different accuracy grade). The INA199 series is designed to replace traditional op-amp solutions by integrating precision resistors and zero-drift amplification in a compact form factor.

Current Regulation/Management Replacement Considerations

INA199A2RSWR provides similar functionality but with a 100 V/V gain. INA199B3RSWR offers the same 200 V/V gain but may differ in accuracy grading.