The 1N6463US is a unidirectional Zener TVS diode from Microchip Technology, designed to clamp voltage transients on a 12V nominal rail. It delivers 500W peak pulse power per the 10/1000µs waveform, with a clamping voltage of 22.6V at the peak current of 125A (8/20µs). The SQ-MELF B package is a surface-mount hermetic ceramic body — the same footprint used in military and aerospace transient suppression — rated for the full -55°C to 175°C junction temperature range.
Peak Pulse Power and Clamping Performance
At 500W peak pulse power, this part handles surges that would destroy a standard signal diode. The 12V reverse standoff voltage means the rail sits at 12V or below during normal operation; the diode only conducts when the transient exceeds the 13.6V minimum breakdown threshold. The 22.6V clamp at 125A (8/20µs) gives the downstream circuitry a hard voltage ceiling — useful for protecting 12V power inputs, sensor lines, or communication ports in industrial or avionics gear.
Lifecycle and Sourcing Posture
The SQ-MELF package is a standard hermetic format, so reel quantities are available through distribution. For BOM commitment, this part is sourced per RFQ — confirm the required quantity and delivery window, and we will quote against the current market.