INA321EA/250G4

Overview

The INA321EA/250G4 is a micro-power, single-supply CMOS instrumentation amplifier manufactured by Texas Instruments. It features a 500 kHz bandwidth and a 90 dB common-mode rejection ratio (CMRR). The device operates on a supply voltage range of 2.7 V to 5.5 V with a typical operating current of 40 µA per channel. Key electrical specifications include an input bias current of 10 pA, an input offset voltage of 1 mV, and a gain error of 0.01%. It utilizes a VSSOP-8 package and supports a wide operating temperature range from -55°C to +125°C.

Feature Summary

• Provides rail-to-rail output swing for efficient signal utilization in low-voltage systems.
• Features internal configuration at 5 V/V gain with flexibility for user-programmable external gain resistors.
• Maintains high CMRR up to 3 kHz to effectively reject line noise and harmonics.

Applications

• Industrial sensor amplification including bridge, RTD, and thermistor circuits
• Physiological signal amplification such as ECG, EEG, and EMG
• Signal conditioning for analog-to-digital converters

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's official documentation to confirm compliance details and revision status. Ensure the ordering part number matches the required package type and tape-and-reel quantity specifications. Cross-reference the datasheet version to validate all electrical parameters before finalizing procurement orders.

Selection Notes

Select this component when low power consumption is critical alongside high precision requirements. The CMOS architecture offers superior input impedance compared to bipolar alternatives. Consider the fixed internal gain option if external resistor matching is undesirable, or utilize the programmable gain feature for flexible system designs requiring specific amplification factors.

Part Context

This device belongs to the INA321 series of micro-power instrumentation amplifiers. It is designed to replace discrete solutions by offering integrated precision in a small footprint. The series supports both single and dual versions, providing designers with options for multi-channel applications while maintaining consistent performance characteristics across the family.

Replacement Considerations

Direct replacements within the same series include the standard INA321EA/250 variant. Verify pin compatibility and electrical parameter equivalence when substituting with other TI instrumentation amplifiers. Ensure that any alternative component meets the specific voltage and current requirements of the existing circuit design.