INA215BIDCKR

Overview

The INA215BIDCKR is a bidirectional, zero-drift current-sense amplifier manufactured by Texas Instruments. It operates on a single supply voltage ranging from 2.7 V to 26 V and features a fixed gain of 75 V/V. The device supports a common-mode voltage range of -0.3 V to 26 V, enabling high-side or low-side sensing. Key electrical specifications include an input offset voltage of 1 µV, a gain error of 0.02%, and a power supply current of 100 µA. It provides a CMRR of 140 dB and a bandwidth of 40 kHz. The component is housed in a SC-70-6 package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Zero-drift architecture ensures low offset voltage for accurate measurement of small shunt voltages down to 10 mV full scale.
• Bidirectional capability allows detection of current flow in both directions across the sense resistor.
• High common-mode rejection ratio maintains accuracy despite large common-mode voltage fluctuations.

Applications

• Battery management systems requiring precise current monitoring
• Industrial process control loops with high common-mode voltages
• Power supply output current sensing

Procurement Notes

Verify the specific suffix 'CKR' corresponds to the SC-70-6 tape-and-reel packaging configuration. Confirm that the 'B' grade designation meets the required offset voltage and gain error tolerances for the application. Ensure the operating environment stays within the specified -40°C to +125°C junction temperature limits to maintain performance integrity.

Selection Notes

Select this component when high precision is required at low signal levels due to its microvolt-level offset. The wide common-mode range makes it suitable for high-side sensing in systems with floating grounds or high voltage rails. Consider the fixed 75 V/V gain against the expected maximum shunt voltage drop to ensure the output remains within the supply rail limits.

Part Context

This part belongs to the INA21x family of bidirectional current-sense amplifiers. These devices are designed for applications where space is constrained, utilizing compact packages like SC-70. The family shares the zero-drift technology platform, offering improved accuracy over traditional chopper-stabilized amplifiers without the associated noise spikes.

Replacement Considerations

INA210BIDCKR: Lower bandwidth (4 kHz) and higher offset (550 nV vs 1 µV? No, INA210 is 550nV, INA215 is 1uV. Wait, datasheet says INA210 Vos 550nV, INA215 Vos 1uV. Actually INA210 has lower offset but lower GBP. INA215 has higher GBP. They are not direct pin-compatible replacements if bandwidth matters. INA211/212/213/214 have different gains. Direct replacement requires matching Gain (75V/V), Package (SC-70-6), and Offset specs. No other INA21x has exactly 75V/V gain except INA215. Thus, no direct functional substitute exists within the same family with identical gain.