INA321EA/2K5G4

Overview

The INA321EA/2K5G4 is a micro-power, single-supply CMOS instrumentation amplifier manufactured by Texas Instruments. It features two channels in a TSSOP-14 package. Key electrical parameters include a gain bandwidth product of 500 kHz, a common-mode rejection ratio (CMRR) of 90 dB, and an input bias current of 10 pA. The input offset voltage is specified at 1 mV. It operates on a supply voltage ranging from 2.7 V to 5.5 V with an operating supply current of 40 uA. The device supports a gain range of 5 V/V to 1000 V/V and has a power supply rejection ratio (PSRR) of approximately 86 dB. It functions within a temperature range of -55°C to +125°C.

Feature Summary

• Micro-power single-supply CMOS architecture designed for low energy consumption applications
• High precision signal conditioning with 90 dB common-mode rejection ratio
• Wide gain adjustability supporting ratios from 5 V/V up to 1000 V/V
• Rail-to-rail output capability suitable for driving ADCs directly

Applications

• Driving sampling analog-to-digital converters in noisy environments
• Precision data acquisition systems requiring high CMRR
• Battery-powered instrumentation due to low supply current

Procurement Notes

Verify the specific suffix 'G4' against the official Texas Instruments datasheet to confirm RoHS compliance status and packaging details. Ensure the ordering part number matches the required tape-and-reel quantity of 2500 units if applicable. Cross-reference the Mouser or DigiKey part numbers for accurate stock availability and lead times before finalizing procurement plans.

Selection Notes

Select this component when designing circuits that require dual-channel instrumentation amplification with strict power constraints. The 500 kHz bandwidth and 10 pA input bias current make it suitable for high-impedance sensor interfaces. Consider the TSSOP-14 package size for PCB layout constraints compared to the MSOP-8 variant found in the single-channel INA321.

Part Context

This device belongs to the INA2321 family of micro-power instrumentation amplifiers. It shares core specifications such as bandwidth, bias current, and supply voltage range with the single-channel INA321, but offers dual-channel integration in a larger package. The family is characterized by its CMOS construction, enabling operation from low supply voltages while maintaining high accuracy.

Replacement Considerations

The INA321EA/250 serves as a functional substitute for single-channel designs, sharing identical electrical characteristics including 500 kHz bandwidth and 40 uA supply current. Verify pin compatibility and package differences between TSSOP-14 and VSSOP-8 when substituting.