Device identity and key parametric
The Texas Instruments 5409FMQB is an AND gate from the TTL/H/L series, a standard logic function for gating digital signals in control and data paths. It is classified under Logic ICs and ships in a Bulk package — the loose-tube format typical for through-hole logic devices that go into socketed or wave-solder production.
Lifecycle and compliance reality
RoHS non-compliant — this part uses lead-bearing solder terminations. It is exempt from RoHS restrictions for certain high-reliability and military/aerospace applications, but a RoHS-compliant BOM line will require a different order code or a waiver.
Sourcing and procurement posture
Peer part numbers such as 9005PC and JM38510/65103BCA exist in the same logic class but are not guaranteed drop-in replacements without pin-for-pin and timing verification.