5.1 V Zener Diode — Selection Parameters and Fit
The 1N4733CPE3/TR12 is a 5.1 V zener diode from Microchip Technology, rated for 1 W continuous power dissipation in the standard DO-204AL (DO-41) axial-lead package. The ±2% tolerance on the nominal zener voltage makes this part suitable for reference or clamping applications where a tighter regulation band is required than the standard 5% or 10% grades of the 1N4733 family. With a maximum zener impedance of 7 Ohms at the test current, the regulation accuracy holds across a moderate current range. The 10 µA reverse leakage at 1 V reverse voltage is low for a 5.1 V device, which matters in battery-powered or high-impedance bias circuits where leakage current directly affects the operating point.
Temperature Range and Package — Deployment Context
The DO-204AL (DO-41) axial package with through-hole mounting is a standard footprint for point-to-point wiring, PCB through-hole assembly, or terminal-strip integration in power supplies, voltage references, and protection clamps. Supplied in Tape & Reel (TR) packaging, this variant is suited for automated insertion equipment in medium-to-high volume production.