Active production — 4.3 V zener in DO-214AC
The SMAJ4731AE3/TR13: The ±5% tolerance on the nominal zener voltage means the regulation point sits between 4.085 V and 4.515 V across the full operating temperature range of -55°C to 150°C — wide enough for general-purpose shunt regulation but tight enough for most bias and clamp circuits.
9 Ohm max impedance — regulation under load
Maximum dynamic impedance (Zzt) is 9 Ohms at the test current — this sets the voltage shift when the load current varies. A 10 mA change in zener current shifts the output by up to 90 mV, which is within the ±5% tolerance band for most bias applications.
Tape & Reel — feeder-ready for volume assembly
Supplied on Tape & Reel (TR), the part is feeder-ready for automated pick-and-place lines — no manual handling or re-reeling needed for standard SMA pad layouts.