INA321E/2K5

Overview

The INA321E/2K5 is a microPower, single-supply CMOS instrumentation amplifier from Texas Instruments. It features rail-to-rail output and operates within a voltage range of 2.7 V to 5.5 V. Key electrical parameters include a 3dB bandwidth of 500 kHz, a common-mode rejection ratio (CMRR) of 90 dB, and an input bias current of 10 pA. The device has a maximum input offset voltage of 1 mV and consumes only 40 uA of operating supply current. It offers a gain range of 5 V/V to 1000 V/V with a gain error of 0.01%. The component is housed in an 8-VSSOP package and supports operation temperatures from -55°C to +125°C.

Feature Summary

• MicroPower CMOS architecture designed for low energy consumption applications
• Rail-to-rail output capability ensures full signal swing utilization
• Single-supply operation simplifies power system design
• High precision performance with low input offset voltage and bias current

Applications

• Driving sampling analog-to-digital converters
• Detection of differential signals from interference voltages
• General-purpose applications requiring high accuracy in electrically noisy environments

Procurement Notes

Verify the specific suffix '2K5' corresponds to the required tape-and-reel quantity configuration during procurement. Confirm that the 8-VSSOP package type matches the PCB footprint requirements. Ensure the operating temperature range of -55°C to +125°C meets the environmental specifications of the target application. Cross-reference the manufacturer part number with official Texas Instruments documentation to avoid counterfeit components.

Selection Notes

Select this component when low power consumption is critical alongside high precision signal conditioning. The single-supply operation makes it suitable for battery-powered systems. Consider the 500 kHz bandwidth and 90 dB CMRR for applications involving noisy environments. The rail-to-rail output is advantageous for maximizing dynamic range in low-voltage systems. Evaluate the gain range requirements against the available internal resistor options.

Part Context

The INA321 belongs to a family of rail-to-rail output, microPower CMOS instrumentation amplifiers. This series is engineered to offer wide-range gain capabilities while maintaining single-supply compatibility. The family addresses the need for accurate signal amplification in space-constrained and power-sensitive designs. The INA321 variant specifically integrates precision resistors to set gains, reducing external component count.

Replacement Considerations

Check for direct pin-compatible alternatives within the same instrumentation amplifier family. Verify that substitute parts maintain the 8-VSSOP package and similar electrical characteristics such as bandwidth and supply current.