INA181A2IDCKR

Overview

The INA181A2IDCKR is a single-channel bidirectional current-sense amplifier from Texas Instruments, housed in a SC-70-6 package. It features a fixed gain of 50 V/V and supports a common-mode voltage range from -0.2 V to +26 V. The device operates on a supply voltage between 2.7 V and 5.5 V with a maximum quiescent current of 260 µA. Key electrical specifications include a bandwidth of 210 kHz, an input offset voltage of ±150 µV, and a slew rate of 2 V/µs. It provides rail-to-rail output swing and maintains high accuracy with a gain error of ±1% over the extended temperature range of -40°C to +125°C.

Feature Summary

• Bidirectional sensing capability allows accurate measurement of current flow in both directions by utilizing a reference pin for output offset.
• Integrated matched resistor network ensures precise gain stability and minimizes temperature drift across operating conditions.
• Wide common-mode input range enables operation in both high-side and low-side configurations independent of the supply voltage.

Applications

• Motor control systems requiring rapid response to changing currents
• Battery monitors and balancers for energy management
• Power management circuits for efficient load monitoring

Procurement Notes

Verify the specific ordering suffix IDCKR corresponds to the SC-70-6 package variant when sourcing. Confirm that the A2 designation matches the required 50 V/V gain for your circuit design. Ensure compatibility with the target operating temperature range and supply voltage constraints before finalizing procurement.

Selection Notes

Select this component when a fixed 50 V/V gain is required for bidirectional current monitoring. It is suitable for applications needing a wide common-mode range up to 26 V while powered by low voltages. Consider the SC-70-6 package size if board space is limited compared to larger SOT-23 options.

Part Context

This part belongs to the INAx181 family of cost-optimized current-sense amplifiers. The family includes dual-channel (INA2181) and quad-channel (INA4181) variants sharing similar electrical characteristics. The INA181 specifically offers a single-channel solution available in multiple gain options and package types to suit various system integration needs.

Replacement Considerations

Other members of the INA181 family such as INA181A1IDCKR or INA181A3IDCKR offer different fixed gains but share the same package and core functionality. Cross-referencing datasheets is necessary to ensure gain requirements align with the replacement part.