INA181A4IDCKR

Overview

The INA181A4IDCKR is a single-channel bidirectional current-sense amplifier from Texas Instruments. It operates on a 2.7-V to 5.5-V supply and supports common-mode voltages from –0.2 V to +26 V. The device features a fixed gain of 200 V/V, a bandwidth of 105 kHz, and a maximum quiescent current of 260 µA. It provides rail-to-rail output swing and maintains high accuracy with a maximum gain error of ±1% and offset drift of 1 µV/°C across the –40°C to +125°C temperature range.

Feature Summary

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

Applications

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

Procurement Notes

Verify the specific suffix IDCKR corresponds to the SC-70-6 package variant when sourcing. Confirm that the A4 designation matches the required 200 V/V gain for the design. Ensure the component meets RoHS compliance requirements for the target assembly process. Cross-reference the datasheet revision history for any updates to electrical characteristics or pin configurations prior to finalizing procurement orders.

Selection Notes

Select this part when a fixed 200 V/V gain is necessary for high-resolution current measurement. The SC-70-6 package offers a compact footprint suitable for space-constrained designs. Consider the 105 kHz bandwidth limit for applications requiring faster transient response. Verify that the 26 V common-mode range aligns with the system bus voltage levels to ensure proper operation within recommended conditions.

Part Context

This component 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 specifications. The INA181 series is designed for applications requiring accurate shunt monitoring in both low-side and high-side configurations without complex external circuitry.

Replacement Considerations

Compatible substitutes include other INA181 variants with different gains such as INA181A1IDCKR, INA181A2IDCKR, or INA181A3IDCKR if gain adjustment is acceptable.