The Microchip SMAJ4735AE3/TR13 is a 6.2 V Zener diode in the standard DO-214AC (SMA) surface-mount package, rated for 2 W continuous power dissipation. The 6.2 V nominal breakdown at 2 Ohms impedance means it clamps the rail at that voltage with minimal slope — useful as a shunt regulator or voltage reference in a low-power supply where the load current stays under the 320 mA thermal limit at 25°C ambient. The ±5% tolerance on Vz means the actual breakdown sits between 5.89 V and 6.51 V — tight enough for a 5 V rail clamp but not for a precision reference where a 1% or 2% part would be specified.
Leakage and forward drop — the secondary specs that matter
Reverse leakage is 10 µA max at 3 V reverse voltage — this is the quiescent draw when the Zener is below breakdown. In a battery-powered circuit the leakage at the operating point (3 V on a 6.2 V Zener) is negligible, but if the rail sits near breakdown the leakage rises exponentially. Forward voltage is 1.2 V max at 200 mA — this is the drop when the diode is forward-biased. It matters if the part is used as a bidirectional clamp or if the forward conduction path carries significant current during a transient.
The Tape & Reel packaging (TR suffix) is the standard reel quantity for automated pick-and-place assembly.