1500W surge protection in a DO-201AD axial package
The 1N6294A is a unidirectional Zener TVS diode from the onsemi Mosorb™ series, rated for 1500W peak pulse power. That 1.5kW rating means it can clamp a transient surge to 125V maximum at the rated current, protecting downstream silicon from overvoltage events in general-purpose DC rail and signal-line applications. Its reverse standoff voltage of 77.8V and minimum breakdown of 86.5V place it on a 75V or 80V nominal rail — the standoff is the maximum DC voltage the diode will not conduct at, so the rail must stay below that to avoid leakage.
Obsolete — plan your BOM move now
onsemi lists the 1N6294A as Obsolete. That means no further production from the factory. For a BOM line that still calls this part, the practical path is sourcing from independent or franchised-distributor inventory — we can quote to order against your quantity from available stock in the open market. No official successor is published by onsemi for this exact order code. The axial footprint and 1500W rating narrow the replacement search to other 1500W unidirectional TVS Zeners in the same package — confirm the standoff voltage and clamping spec match before substituting.
Temperature range and mounting fit
The 1N6294A operates from -65°C to 175°C junction temperature, which covers military and industrial thermal profiles — avionics, outdoor telecom cabinets, and engine-bay electronics are within envelope. Through-hole axial DO-201AD package: leads are 0.052-inch diameter typical, body length about 0.375 inches. The axial leads require manual or wave-solder assembly; no MSL concern since it is a hermetic glass-passivated die in a molded case.