LT1490AIS8

Instrumentation, Op Amps, Buffer Amps Overview

The LT1490AIS8 is a dual micropower rail-to-rail operational amplifier manufactured by Analog Devices Inc. It operates on total supply voltages from 2V to 44V with a quiescent current of 50µA per amplifier. The device features an input offset voltage maximum of 700µV and a gain bandwidth product of 180kHz. It provides reverse supply protection up to 18V and supports over-the-top common mode inputs extending 44V above the negative supply. The output swings to within 10mV of the negative rail and drives loads up to 20mA.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Over-The-Top input stage allows operation with common mode voltages up to 44V above the negative supply, independent of the positive supply voltage.
• Reverse battery protection prevents damage and limits leakage current when subjected to reverse supply voltages up to 18V.
• Rail-to-rail output capability enables the output to swing to within 10mV of the negative supply rail under specified load conditions.
• Micropower architecture maintains low quiescent current consumption while supporting heavy capacitive loads up to 10,000pF with compensation.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery monitoring systems
• Portable instrumentation
• Sensor conditioning circuits
• Supply current sensing
• Micropower active filters

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix IS8 corresponds to the 8-lead plastic SO package and the AI grade for the –40°C to 85°C operating temperature range. Confirm the TRPBF designation indicates tape and reel packaging with lead-free finish. Ensure the component matches the manufacturer's ordering information for the LT1490AI variant before finalizing procurement specifications.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component for applications requiring high common mode voltage tolerance relative to the negative rail without exceeding the positive supply limit. The device is suitable for single or split supply designs where low power consumption is critical. Verify that the required output drive current does not exceed 20mA and consider external compensation if driving capacitive loads greater than 200pF to ensure stability.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the LT1490A/LT1491A family of dual and quad operational amplifiers designed for micropower applications. The LT1490A specifically denotes the dual configuration, while the LT1491A represents the quad version. Both variants share identical electrical characteristics and pinouts for their respective channel counts, offering a scalable solution for space-constrained designs.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

LT1490AIMS8#TRPBF (MSOP Package)

Instrumentation, Op Amps, Buffer Amps FAQ

How does the LT1490A handle input voltages exceeding the positive supply?

The amplifier utilizes an Over-The-Top input stage that remains high impedance and functional even when input voltages are up to 44V above the negative supply, regardless of the positive supply level.

What is the maximum reverse supply voltage the device can withstand?

The LT1490A includes built-in reverse supply protection that allows it to withstand reverse voltages up to 18V while drawing virtually no current.