Dual comparator in a tiny package — what it is and where it fits
The LMX393AUA is a dual, tiny-pack comparator from National Semiconductor — two independent voltage comparators squeezed into a space-saving package for dense PCB layouts where board real estate is tight. It's the kind of part you reach for when a single comparator won't cover both channels and you don't have room for two separate SOIC-8s. Typical applications include threshold detection, zero-crossing detectors, and window comparators in power supplies, motor drives, and industrial control boards where you need two comparators side by side without doubling the footprint.
Active lifecycle — no LTB clock ticking
The LMX393AUA carries an Active product status, so there's no last-time-buy window closing or end-of-life notice to worry about for current production runs. If your BOM needs to meet RoHS directives (EU, China, etc.), this part won't pass without an exemption. For legacy designs or military/aerospace builds where leaded solder is still permitted or exempted, it's a straightforward drop-in. No second-source alternate is listed in the available records, so dual-sourcing would require qualification of a functionally equivalent comparator from another vendor.
What the ratings mean for your BOM
The supply voltage range is not listed in the available specs. Verify against the full datasheet.