INA181A4IDBVT

Overview

The INA181A4IDBVT is a single-channel current-sense amplifier from Texas Instruments, housed in a SOT-23-6 package. It operates on a supply voltage ranging from 2.7 V to 5.5 V with a typical quiescent current of 260 µA. The device features a gain bandwidth product of 105 kHz and a -3 dB bandwidth of 350 kHz. It supports bidirectional sensing with a common-mode voltage range of -200 mV to 26 V. Key electrical specifications include an input offset voltage of 100 µV, a CMRR of 100 dB, and a fixed gain of 200 V/V.

Feature Summary

• Supports bidirectional current sensing with a wide common-mode voltage range extending below ground.
• Provides high accuracy with low input offset voltage and high common-mode rejection ratio.
• Features rail-to-rail output capability for efficient signal interfacing.
• Delivers fast transient response suitable for dynamic load monitoring applications.

Applications

• Low-side current monitoring in battery-powered systems
• Overcurrent protection circuits in industrial equipment
• Load switching control in portable devices

Procurement Notes

Verify the specific suffix IDBVT indicates tape-and-reel packaging when ordering. Confirm the A-grade variant meets required precision standards for your design. Ensure the SOT-23-6 footprint matches your PCB layout constraints. Check for RoHS compliance status if environmental regulations apply to your region. Validate that the 26 V common-mode limit aligns with your system's maximum operating voltages.

Selection Notes

Select this component when bidirectional measurement is required within a compact SOT-23-6 form factor. The 200 V/V gain is optimal for detecting small voltage drops across low-value shunt resistors. Consider the 260 µA supply current for strict power budgeting in portable electronics. The 350 kHz bandwidth supports faster switching applications compared to lower-speed alternatives.

Part Context

This part belongs to the INA181 family of precision current-sense amplifiers designed for low-voltage, space-constrained applications. It shares architectural similarities with the INA180 but offers a six-pin package variant for enhanced pinout flexibility. The device integrates laser-trimmed resistors to ensure high gain accuracy without external components.

Replacement Considerations

The INA181A2IDBVT serves as a functional substitute with identical electrical characteristics but a different fixed gain setting. Designers must verify that the alternative gain value does not compromise the required measurement resolution or output swing in the existing circuit topology.