INA2181A4IDGST

Overview

The INA2181A4IDGST is a dual-channel, bidirectional current sense amplifier manufactured by Texas Instruments. It operates within a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages up to 26 V. Key electrical specifications include a gain of 200 V/V, a gain error of 0.1%, and an input offset voltage (Vos) of 100 µV. The device features a gain-bandwidth product of 105 kHz, a common-mode rejection ratio (CMRR) of 100 dB, and an input bias current (Ib) of 75 µA. It consumes 500 µA of operating supply current and has an input voltage noise density of 40 nV/√Hz. The component functions across a temperature range of -40°C to +125°C and is housed in a 10-VSSOP package.

Feature Summary

• Dual-channel architecture providing independent signal processing for two separate current sensing paths
• Bidirectional measurement capability allowing detection of current flow in both directions
• High common-mode voltage tolerance supporting system monitoring at voltages up to 26 V

Applications

• Industrial process control systems requiring precise current monitoring
• Power distribution units for load management and protection
• Battery management systems for charge and discharge tracking

Procurement Notes

Verify the specific suffix IDGST against the manufacturer's official datasheet to confirm the MSOP-10 package variant and tape-and-reel orientation. Confirm RoHS compliance status through the latest regulatory documentation. Check for obsolescence notices as the component lifecycle status indicates potential discontinuation. Ensure the ordering part number matches the required gain accuracy and channel configuration before finalizing procurement orders.

Selection Notes

Select this component when dual-channel isolation is required within a single package footprint. The 200 V/V gain is suitable for detecting small voltage drops across low-value shunt resistors. Verify that the 26 V common-mode range aligns with the system bus voltage. Consider the 500 µA quiescent current if power efficiency is a critical design constraint compared to lower-power alternatives.

Part Context

This device belongs to the INA2181 series of current sense amplifiers from Texas Instruments. It shares architectural similarities with the INA2180 but offers dual-channel functionality instead of a single channel. The series is designed for high-accuracy applications requiring robust performance in noisy industrial environments. It complements other precision analog components in power management and signal conditioning circuits.

Replacement Considerations

The INA2180A4IDGKT is a related dual-channel variant within the same family, though it utilizes an 8-VSSOP package. Single-channel alternatives such as the INA181A4IDBVR exist but require additional board space for dual-sensing applications. Verify pin compatibility and thermal characteristics when substituting.