2.4 V regulation in a hermetic surface-mount package
The 1N6309US is a 2.4 V Zener diode rated for 500 mW continuous power dissipation in a hermetic SQ-MELF package. The 2.4 V nominal voltage at 30 Ohms maximum impedance means the output shifts about 30 mV per mA of load current change — a consideration when this diode sets a reference rail for a low-current bias or clamps a signal line just above ground. The SQ-MELF (B) body is a surface-mount ceramic package with metallized end caps, designed for high-reliability soldering and good thermal conduction to the board. The -65°C to 175°C operating range covers military/aerospace temperature excursions and downhole or engine-bay thermal profiles.
Reverse leakage is specified at 100 µA maximum when 1 V is applied across the junction. At 2.4 V the leakage will be higher — the Zener knee is soft at this low voltage, so the leakage current at the regulation point is not the 100 µA figure but the current needed to reach 2.4 V, which is typically a few mA. The 1.4 V forward drop at 1 A forward current confirms this diode can also serve as a general-purpose rectifier in a pinch, though the 500 mW power limit restricts continuous forward duty.