INA322EA/250

Overview

The INA322EA/250 is a micropower, single-supply CMOS instrumentation amplifier manufactured by Texas Instruments. It features a rail-to-rail output swing and operates within a supply voltage range of +2.7V to +5.5V. The device offers a bandwidth of 500kHz at a gain of 5V/V and a slew rate of 400mV/us. Key electrical parameters include an input bias current of 10pA, an input offset voltage of 10mV, and a quiescent current of 40µA per channel. It provides a shutdown mode with less than 1µA consumption and is housed in an MSOP-8 package.

Feature Summary

• Micropower operation with 40µA quiescent current per channel
• Rail-to-rail output swing capability for wide dynamic range
• Low input bias current of 10pA suitable for high impedance sources
• Shutdown mode reduces current consumption below 1µA

Applications

• Industrial sensor amplifiers including bridge, RTD, and thermistor circuits
• Physiological signal amplification such as ECG, EEG, and EMG
• Signal conditioning for A/D converters
• Differential line receivers with gain
• Field utility meters and PCMCIA cards

Procurement Notes

Verify the specific ordering suffix /250 corresponds to the VSSOP-8 tape and reel packaging configuration. Confirm that the component meets RoHS compliance standards required for the target assembly process. Ensure the moisture sensitivity level rating aligns with the manufacturing facility's storage and reflow soldering capabilities to prevent package damage during installation.

Selection Notes

Select this component when low power consumption and high precision are critical requirements. The external resistor gain setting allows flexibility for gains greater than 5V/V. Consider the 500kHz bandwidth and 400mV/us slew rate for applications requiring fast signal response. Verify that the input common-mode range and reference pin requirements fit the system architecture constraints.

Part Context

This part belongs to the INA322 family of micropower instrumentation amplifiers. It is designed as a cost-effective alternative to discrete designs while offering superior reliability. The device integrates a modified two-op-amp topology with an additional gain stage to achieve high performance in a small surface-mount package.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.