The Texas Instruments LM321LVIDBVR is a single general-purpose operational amplifier in a SOT-23-5 package. It operates from 2.7 V to 5.5 V, draws 90 µA supply current, and delivers a 1 MHz gain-bandwidth product with a 1.5 V/µs slew rate.
Single-channel layout, SOT-23-5 footprint
One op-amp per package, so a quad-channel design needs four devices. The SOT-23-5 footprint is a common small-outline transistor package, surface-mount only.
For a BOM freeze or a new design, this part carries no immediate obsolescence risk.