1500W peak pulse power in a through-hole axial package
The 1N6290A is a Zener TVS diode from onsemi's Mosorb™ series, rated for 1500W peak pulse power at 10/1000 µs waveform. That 1500W rating tells you it can absorb a substantial transient without failing — useful for clamping surges on 48V or 53V rails in industrial or telecom gear. The DO-201AD axial package is a through-hole legacy footprint; it's robust for high-energy pulses but takes up more board area than a surface-mount alternative.
Voltage window and unidirectional clamping
Reverse standoff voltage is 53V, breakdown minimum is 58.9V, and clamping at peak pulse current is 85V max. This window means the diode stays off below 53V, starts conducting around 59V, and holds the line to 85V under full surge — a tight enough clamp to protect a 60V-rated downstream device. It is a single unidirectional channel, so polarity matters on the board.
Obsolete — sourcing through independent channels
onsemi lists the 1N6290A as Obsolete.
Temperature range and storage considerations
Operating junction temperature spans -65°C to 175°C, which covers most industrial and some military-grade environments.