What the 5421FM is and what it does
The 5421FM is a single AND gate from the * series, a basic logic building block that outputs a HIGH only when all its inputs are HIGH. It is, typical for through-hole or large-pin-count devices used in prototyping, legacy repairs, or assemblies where lead-free compliance is not required.
Lifecycle and compliance — what it means for your BOM
This removes obsolescence risk for new designs or ongoing production. However, it is RoHS non-compliant, so it cannot be used in assemblies that must meet RoHS directive requirements — verify your exemption or project waiver before committing the BOM line.
