24 V nominal, 500 mW — the regulation anchor for a low-power rail
The 1N6009B/TR is a 24 V Zener diode in the standard DO-35 axial-lead package, rated for 500 mW continuous power dissipation. The ±5% tolerance on the nominal voltage means the actual breakdown sits between 22.8 V and 25.2 V — tight enough to clamp a 24 V logic supply or provide a stable reference for a low-current bias rail. Reverse leakage is specified at 100 nA maximum when biased at 18 V, which is well below the knee. The diode does not start conducting appreciably until the applied voltage approaches the 24 V breakdown point, so it draws negligible current from the protected rail in normal operation.
DO-35 axial — through-hole assembly, tape-and-reel feed
The DO-204AH (DO-35) glass body with axial leads is a through-hole package suited for hand insertion or wave solder. The Tape & Reel (TR) suffix on this order code means the parts come on a carrier tape for automatic insertion equipment — the reel quantity is the standard DO-35 reel count, so a single reel covers a moderate production run without splicing.
Active production — no last-time-buy pressure
The DO-35 Zener family is a long-running catalog line, so the risk of a sudden discontinuation is low.