INA181A1IDCKR

Overview

The INA181A1IDCKR is a single-channel bidirectional current-sense amplifier from Texas Instruments. It features a fixed gain of 20 V/V and a bandwidth of 350 kHz. The device operates on a supply voltage between 2.7 V and 5.5 V, with a maximum quiescent current of 260 µA. It supports a common-mode input range from -0.2 V to +26 V. Key electrical specifications include an offset voltage of ±150 µV, a common-mode rejection ratio of 84 dB, and a slew rate of 2 V/µs. It is housed in a 6-pin SC-70 package.

Feature Summary

• Bidirectional current sensing capability for monitoring flow in both directions
• Integrated matched resistor network for precise gain stability
• Wide common-mode voltage range independent of supply voltage
• Rail-to-rail output swing for extended dynamic range

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 and industrial temperature grade. Confirm RoHS compliance status through official manufacturer documentation. Ensure the ordering part number matches the required gain option A1 (20 V/V). Check for any recent product change notifications regarding packaging or assembly sites.

Selection Notes

Select this component when a fixed 20 V/V gain is required for high-side or low-side current sensing. The 350 kHz bandwidth suits applications needing rapid response to current changes. Verify that the 26 V common-mode range covers the system bus voltage. Consider the SC-70 package size constraints against available board space.

Part Context

This device belongs to the INAx181 family of cost-optimized current-sense amplifiers. The family includes dual-channel (INA2181) and quad-channel (INA4181) variants. All devices share similar electrical characteristics but differ in channel count and package options. The A1 designation specifically indicates the 20 V/V gain configuration within the series.

Replacement Considerations

Direct substitutes within the same family include INA181A2IDCKR (50 V/V), INA181A3IDCKR (100 V/V), and INA181A4IDCKR (200 V/V). These parts maintain identical pinouts and performance except for the fixed internal gain.