The 1N6115US: No end-of-life notice or successor part has been issued, which simplifies BOM planning for long-running designs.
The 500 W rating is the energy-handling ceiling for a single surge event; below that, the device shunts the overvoltage without damage. The 18.2 V standoff sits low enough to avoid nuisance clamping during normal ripple, yet the 21.66 V minimum breakdown triggers early enough to protect downstream regulators and logic.
SQ-MELF package – footprint and thermal handling
Housed in an SQ-MELF B package (surface-mount, cylindrical body with wraparound metalized ends), the 1N6115US is designed for automated pick-and-place assembly. The metalized end caps provide a direct thermal path to the board copper, which is critical for dissipating the pulse heat.