5.1 V, 2 W — active production zener for general-purpose regulation
The SMAJ4733E3/TR13 is a 5.1 V zener diode in the DO-214AC (SMA) surface-mount package, rated for 2 W continuous power dissipation.
The 5.1 V nominal zener voltage with ±10% tolerance means the regulation point sits between 4.59 V and 5.61 V — wide enough for general-purpose rail clamping or shunt regulation but not precision reference duty. Maximum zener impedance of 7 Ohms at the test current means the output voltage shifts about 7 mV per mA of bias current change; for a shunt regulator this sets the load-regulation floor. Reverse leakage is 10 µA max at 1 V reverse — low enough that in a 5 V rail clamp it draws negligible current below the zener threshold, preserving battery life in portable designs.
Temperature grade and deployment environment
Operating temperature range of -55°C to 150°C covers industrial floor automation, outdoor telecom enclosures, and under-hood automotive electronics where ambient peaks near 125°C. The DO-214AC footprint is a standard JEDEC outline for 2 W surface-mount zeners — reflow profile matches the standard 260°C peak for lead-free solder, no special handling beyond MSL level confirmation.