15 V regulation, 1 W dissipation
The 1N4744CP/TR12 is a 15 V Zener diode in the standard DO-204AL (DO-41) axial-lead package, rated for 1 W continuous power dissipation. The ±2% tolerance on the nominal Zener voltage means the regulation point sits between 14.7 V and 15.3 V at the specified test current — tight enough for a 15 V rail feeding a linear regulator or a reference clamp in a 24 V-to-15 V local supply.
Impedance and leakage profile
Maximum Zener impedance (Zzt) is 14 Ohms at the test current — this sets the dynamic regulation slope: a 10 mA load swing shifts the output roughly 140 mV. Reverse leakage is specified at 5 µA maximum at 11.4 V, which is 76% of the nominal Zener voltage, so the diode stays well below the knee in standby. Forward voltage is 1.2 V maximum at 200 mA — a detail worth noting if the diode sees brief forward-bias events during power sequencing or reverse-polarity conditions.
Microchip lists the 1N4744CP/TR12 as Active. The base product number is 1N4744; the CP/TR12 suffix denotes the ±2% tolerance grade and Tape & Reel packaging. No pin-compatible second-source is recorded, but the DO-41 footprint is a standard industry form factor shared by many 1 W Zener families.