The 1N6375G is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power (1.5kW) at 10V reverse standoff. The DO-201AD axial package is a through-hole format common in industrial power supplies, telecom line cards, and general-purpose board-level surge protection where a single unidirectional channel suffices.
onsemi lists the 1N6375G as Obsolete. For BOM lines that still call out this order code, the only supply path is through independent distribution or excess inventory channels.
The 1500W peak pulse rating is the headline spec — any pin-compatible replacement must match or exceed this energy handling at the same clamping voltage. The 10V reverse standoff sets the DC operating voltage the diode will not leak on.