INA2181A3IDSQT

Overview

The INA2181A3IDSQT 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 range of 2.7 V to 5.5 V. The device supports a common-mode input voltage range from –0.2 V to +26 V, enabling high-side and low-side sensing. Key electrical specifications include a maximum quiescent current of 500 µA, a bandwidth of 150 kHz, and an offset voltage of ±500 µV at 12 V common-mode voltage. It is housed in a 10-pin WSON package.

Feature Summary

• Bidirectional current monitoring capability for detecting flow in both directions
• Integrated matched resistor network for minimized gain error and temperature drift
• Wide common-mode voltage range independent of the power supply voltage
• Rail-to-rail output swing allowing linear operation near ground and supply rails

Applications

• Motor control systems
• Battery monitors and balancers
• Power management circuits
• Lighting control applications
• Solar inverters

Procurement Notes

Verify the specific suffix 'DSQ' corresponds to the 10-pin WSON (2x2 mm) package configuration. Confirm that the 'A3' designation matches the required 100 V/V gain option for your circuit design. Ensure compatibility with the extended operating temperature range of –40°C to +125°C. Cross-reference the datasheet revision history for any recent documentation updates or pinout changes before finalizing procurement.

Selection Notes

Select this component when a dual-channel solution is required for precise current monitoring in space-constrained designs. The 100 V/V gain is suitable for applications requiring higher resolution from small shunt voltages. Consider the 150 kHz bandwidth for fast transient response needs. Evaluate the 500 µA quiescent current against system power budgets. Verify that the 26 V common-mode range aligns with the bus voltage levels present in the target application environment.

Part Context

This part belongs to the INAx181 family of cost-optimized current-sense amplifiers. The family includes single-channel (INA181), dual-channel (INA2181), and quad-channel (INA4181) variants. These devices share a unified architecture featuring wide common-mode ranges and rail-to-rail outputs. The INA2181 specifically provides two independent channels within a compact footprint, ideal for multi-phase or dual-load monitoring scenarios.

Replacement Considerations

Direct substitutes within the same family include the INA2181A1IDSQT (20 V/V gain), INA2181A2IDSQT (50 V/V gain), and INA2181A4IDSQT (200 V/V gain). Selection depends on matching the required gain factor. Other channel counts like INA181 or INA4181 require significant layout and schematic modifications.