12 V, 1 W zener — standard DO-41 axial
The 1N4742APE3/TR8 is a 12 V zener diode rated for 1 W continuous power dissipation in the through-hole DO-204AL (DO-41) package. The ±5% tolerance covers general-purpose voltage regulation, clamping, and reference applications where the 12 V nominal rail needs a defined shunt voltage. Maximum zener impedance is 9 Ohms at the rated current — dynamic regulation stays tight enough for most bias and protection circuits. Reverse leakage is 5 µA max at 9.1 V, so standby loss in a shunt configuration is negligible.
Active — no lifecycle risk for new builds
The Tape & Reel packaging (TR suffix) suits automated pick-and-place assembly for axial components.