500W peak pulse power, 15V standoff — surface-mount Zener TVS
The 1N6464US: Packaged in a SQ-MELF (B, MELF style) surface-mount case, it is intended for general-purpose transient suppression on DC power rails, signal lines, or I/O ports where a single unidirectional clamp is needed.
Minimum breakdown voltage is 16.4V, so the part starts conducting at roughly that threshold. The 26.5V clamping ceiling means the protected circuit sees no more than that voltage during a 107A pulse — a key number for selecting the downstream component voltage rating. The wide range is typical for hermetic MELF packages used in high-reliability applications.
Active production — sourcing through standard distribution
Microchip lists the 1N6464US as Active. The base product number is 1N6464; the 'US' suffix denotes the SQ-MELF surface-mount package. The through-hole equivalent (1N6464) shares the same die but in a different package — not pin-compatible, but electrically identical.