500 W bidirectional TVS in a hermetic SQ-MELF
The 11.4 V reverse standoff voltage and 22.05 V clamping at 22.61 A mean it holds off a 12 V rail cleanly and clamps a surge before it reaches downstream silicon. The SQ-MELF B package is a hermetic surface-mount ceramic body — no plastic encapsulation, so moisture sensitivity is not a concern. This package is common in military, aerospace, and downhole applications where outgassing and humidity resistance matter.
Voltage thresholds and thermal envelope
Breakdown voltage starts at 13.54 V minimum, giving margin above the 11.4 V standoff before the device enters avalanche. The clamp at 22.05 V is the let-through voltage the protected circuit must survive — a 12 V-rated rail needs a downstream capacitor or TVS with a higher hold-off to ride through the pulse. At 175°C the leakage current rises, but the silicon still clamps — this is a part for engine bays, satellite thermal vacuum, or oil-well logging tools where the ambient hits 150°C+.
Active production — no last-time-buy pressure
Lifecycle status is Active. No PCN, no EOL notice on this base number.