4.7 V regulation in a hermetic SQ-MELF
The 1N6316US is a 4.7 V Zener diode rated for 500 mW continuous power dissipation in the SQ-MELF B package — a hermetic, surface-mount ceramic body that seals the die against moisture and outgassing. The -65°C to 175°C operating range spans military and avionics temperature profiles, so the regulation point holds across the thermal extremes of an engine bay, satellite orbit, or downhole tool.
Parametric guardbands for the BOM
Maximum Zener impedance (Zzt) is 1.5 kOhms at the test current — this sets the dynamic resistance the load sees; a lower impedance means tighter regulation as the bias current varies. Reverse leakage is specified at 5 µA max at 3.5 V reverse voltage, which is the leakage budget for the node the diode protects. Forward voltage is 1.4 V max at 1 A — useful if the diode is also used as a clamping element in the forward direction.
Active lifecycle — sourcing posture
No pin-compatible replacement is needed for this line item.