INA121U

Overview

The INA121U is a low-power instrumentation amplifier manufactured by Texas Instruments. It features FET-input stages to ensure high input impedance and low bias current. The device operates within a supply voltage range of 4.5V to 36V, or ±2.25V to ±18V. Key electrical parameters include a maximum offset voltage of 2000µV, a bandwidth of 0.6MHz, and a slew rate of 0.7V/µs. Each channel consumes approximately 450µA of quiescent current. The component is housed in an 8-pin SOIC package.

Feature Summary

• FET-input architecture providing high input impedance
• Low power consumption suitable for battery-operated systems
• High common-mode rejection ratio for noise suppression
• Wide single or dual supply voltage operation

Applications

• Sensor signal conditioning
• Data acquisition systems
• Medical instrumentation
• Industrial process control

Procurement Notes

Verify the specific suffix (e.g., -2K5) against the required reel quantity if ordering tape-and-reel packaging. Confirm the package type matches the PCB footprint requirements. Ensure the operating temperature range aligns with the application environment specifications before finalizing procurement.

Selection Notes

Select this component when high input impedance and low power are critical. It is suitable for applications requiring moderate bandwidth and precision amplification of low-level signals. Consider alternative packages if surface mount space is limited or through-hole mounting is preferred.

Part Context

This part belongs to the INA121 family of instrumentation amplifiers from Texas Instruments. It is designed for general-purpose precision applications where low power and high accuracy are balanced requirements. The family includes variants with different gain settings and packaging options.

Replacement Considerations

INA121UA-2K5

FAQ

What is the typical quiescent current per channel?

The typical quiescent current is 450µA per channel.

Does the INA121U require external components for gain setting?

Yes, the gain is set by an external resistor connected between the RG pins.