INA322EA/2K5

Overview

The INA322EA/2K5 is a micropower, single-supply CMOS instrumentation amplifier manufactured by Texas Instruments. It features a rail-to-rail output stage and operates within a supply voltage range of +2.7V to +5.5V. The device provides a bandwidth of 500kHz at a gain of 5V/V with a slew rate of 400mV/us. Key electrical parameters include an input bias current of 10pA, an input offset voltage of 10mV, and a common-mode rejection ratio of 60dB. Quiescent current consumption is 40µA per channel, reducing to less than 1µA in shutdown mode. The component is housed in an MSOP-8 package.

Feature Summary

• Micropower operation with low quiescent current consumption of 40µA per channel
• Rail-to-rail output swing capability for efficient signal processing
• User-programmable gain setting via external resistors
• Shutdown mode functionality for extended battery life in portable applications

Applications

• Industrial sensor amplifiers including bridge, RTD, thermistor, and position sensing
• Physiological amplifiers such as ECG, EEG, and EMG circuits
• A/D converter signal conditioning
• Differential line receivers with gain
• Field utility meters and automotive instrumentation

Procurement Notes

Verify the specific ordering suffix /2K5 indicates a large tape-and-reel quantity of 2500 units. Confirm that the VSSOP (DGK) package designation matches the required footprint for the design. Ensure compatibility with the specified operating temperature range of -55°C to +125°C for the target environment.

Selection Notes

Select this component when low power consumption and high input impedance are critical requirements. The internal 5V/V gain configuration allows for flexible external gain adjustment using standard resistors. Consider the shutdown feature for multiplexing or battery-powered systems where standby current must be minimized below 1µA.

Part Context

This part belongs to the INA322 family of micropower CMOS instrumentation amplifiers. It is designed as a low-cost alternative to discrete designs while offering superior reliability. The family includes single-channel versions like the INA322 and dual-channel variants such as the INA2322, all sharing similar performance characteristics and pinout configurations.

Replacement Considerations

INA322EA/250