Active production — 12 V zener in a DO-41 axial package
The 1N4742E3/TR13 is a 12 V zener diode from Microchip Technology, rated for 1 W continuous power dissipation in a DO-204AL (DO-41) axial-lead package. The ±10% tolerance on the nominal zener voltage means the actual breakdown sits between 10.8 V and 13.2 V at the test current — a band that covers most 12 V rail-clamping and reference applications without tighter binning. With a maximum impedance of 9 Ohms (Zzt), the diode holds the regulation slope tight enough for a 12 V bus in a linear regulator pre-regulator or a low-power TVS role. The 5 µA reverse leakage at 9.1 V confirms the junction is clean — no early breakdown eating into the standby budget.
Temperature grade and through-hole mounting
The DO-41 axial body solders into a 0.036-inch (0.9 mm) diameter hole on a standard 0.100-inch pitch — no reflow profile needed, just a wave or hand-solder step. Supplied on tape and reel (TR suffix), the parts are sequenced for automated insertion equipment. The reel quantity is set by the manufacturer; confirm the exact count per reel at RFQ time.