30 ns reverse recovery — switching speed for the fast-recovery class
The 1N6620US is a standard fast-recovery rectifier diode from Microchip Technology, rated for a 30 ns reverse recovery time (trr) at the 1.2 A forward current level. This 30 ns trr places it firmly in the fast-recovery class (< 500 ns per the spec definition), meaning the diode sweeps out stored charge quickly when switching from forward conduction to reverse blocking — the primary parameter that determines switching loss in a rectifier stage. The 220 V DC reverse voltage rating and 1.2 A average rectified current define the continuous operating envelope: a 220 V DC bus or peak repetitive reverse stress is the ceiling, and the 1.2 A average is the thermal limit for the device in free-air or on a heatsink trace. Reverse leakage is specified at 500 nA maximum at 220 V — this is a low-leakage figure that matters for circuits where the diode sits across a high-impedance node and leakage current could bias the load or discharge a hold-up capacitor.
Hermetic SQ-MELF package — hi-rel surface-mount deployment
The 1N6620US is supplied in the SQ-MELF package (Supplier Device Package A-MELF), a hermetic surface-mount ceramic package with metallized end caps. Hermetic construction means the die is sealed against moisture and contaminants — this is the package choice for military, aerospace, and high-reliability applications where a plastic-encapsulated device would risk failure under humidity or outgassing. For a satellite power supply or an avionics DC-DC converter that sees cold soak at -55°C and internal heating to 125°C, this device operates within its rated junction temperature without derating the reverse voltage or forward current below the datasheet limits. Package capacitance is 10 pF at 10 V reverse bias, 1 MHz — the junction capacitance contributes to the switching loss during voltage transitions, and a 10 pF figure is typical for a 1.2 A fast-recovery die in this voltage class.
Active production — sourcing through qualified distribution
For a BOM line that requires this exact hermetic fast-recovery diode, the active status removes the urgency of a lifetime buy or a board-spin for a replacement.