INA2181A2IDGST

Overview

The INA2181A2IDGST is a dual-channel, bidirectional current-sense amplifier from Texas Instruments. It operates with a supply voltage range of 2.7 V to 5.5 V and supports common-mode voltages up to 26 V. The device features a fixed gain of 200 V/V, a gain-bandwidth product of 105 kHz, and a typical CMRR of 100 dB. Input offset voltage is 100 µV, with an operating supply current of 500 µA per channel. It functions within a temperature range of -40°C to +125°C and is housed in a 10-pin VSSOP package.

Feature Summary

• Dual-channel architecture for simultaneous high-side or low-side current monitoring
• Bidirectional sensing capability independent of the supply voltage
• Integrated matched resistor network ensuring stable gain performance

Applications

• Industrial process control systems requiring multi-rail monitoring
• Battery management systems for electric vehicles and energy storage
• Power distribution units and load switches
• Automotive electronics and infotainment power rails

Procurement Notes

Verify the specific suffix IDGST corresponds to the 10-VSSOP package when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the design accounts for the specified thermal characteristics given the small form factor. Cross-reference the exact part number against the latest datasheet revision to confirm pinout and electrical specifications match the intended application requirements.

Selection Notes

Select this component when dual-channel precision is required within a compact footprint. The 200 V/V gain suits applications detecting small voltage drops across low-value shunt resistors. Consider the 26 V common-mode range for high-voltage bus monitoring. Evaluate the 500 µA quiescent current against system power budgets compared to single-channel alternatives if only one channel is needed.

Part Context

This device belongs to the INA2181 family of current-sense amplifiers designed for cost-sensitive, high-volume applications. It shares core architectural similarities with the single-channel INA181 but provides two isolated channels in one package. The series emphasizes low noise and high common-mode rejection for accurate measurements in noisy environments.

Replacement Considerations

Check for direct pin-compatible substitutes within the same family, such as other gain variants like INA2181A1IDGST or INA2181A3IDGST. Verify that alternative packages meet the physical space constraints of the existing PCB layout.