5.6 V clamping with a 1 W dissipation budget
The 1N4734UR-1/TR is a 5.6 V Zener diode in Microchip's hermetic MELF series, rated for 1 W continuous power dissipation. The 5 Ohm maximum Zzt impedance at the Zener test current keeps the dynamic voltage regulation tight for a shunt regulator or surge clamp feeding a low-current load. Reverse leakage is specified at 10 µA maximum with 2 V applied — low enough that the diode does not drain a battery-powered bias rail in standby.
Hermetic MELF package for harsh environments
The hermetic construction resists moisture ingress and thermal cycling better than plastic-molded SOD-123 or SOT-23 packages — a fit for military, avionics, downhole, or sealed-module designs where outgassing or humidity is a concern. The MELF footprint is cylindrical; the PCB land pattern must account for the barrel-shaped body to avoid tombstoning during reflow. The supplier device package is listed as DO-213AB (MELF, LL41) — the LL41 variant is the same glass-body diameter as the standard MELF, so existing LL41 or DO-213AB footprints apply.
Active lifecycle — stable source for BOM planning
The Tape & Reel (TR) packaging option suits automated pick-and-place assembly; Cut Tape (CT) is also listed for prototype or low-volume builds.