12 V zener — key parametrics for the BOM line
The 1N4742CP/TR8 is a 12 V zener diode in the standard DO-204AL (DO-41) axial-lead package, rated for 1 W continuous power dissipation. The ±2% tolerance on Vz gives a tighter regulation window than the ±5% grade — useful when the zener sets a reference rail or clamps a supply within a narrow band. Maximum impedance (Zzt) is 9 Ohms at the test current, and reverse leakage is specified at 5 µA max with 9.1 V applied across the junction. The forward drop is 1.2 V max at 200 mA, consistent with a standard silicon die.
Package and temperature grade
Supplied in Tape & Reel (TR) for automated assembly, the part uses the through-hole DO-204AL (DO-41) body — a common footprint that mates with standard 0.025-inch square pin sockets or solder-in holes on a 0.100-inch pitch.
Active lifecycle — sourcing posture
Microchip lists the 1N4742CP/TR8 as an active device.