What the 1N6284A protects and how it clamps
When the voltage across it exceeds the 34.2 V minimum breakdown threshold, it conducts avalanche current and holds the clamp at 49.9 V maximum. Rated for 1500 W peak pulse power (1.5 kW) under the 10/1000 µs waveform, this part handles the kind of energy a 24 V industrial supply line or automotive load-dump event throws at it. The DO-201AD axial package means it solders into a through-hole board — the leads carry the surge current into the silicon junction, so the PCB trace width to and from the anode/cathode matters for the peak current path.
onsemi lists the 1N6284A as Obsolete. No direct factory orders or lifecycle buy window remains open. That wide range is typical for a through-hole TVS — the axial package and large die handle the thermal cycling without the solder-joint fatigue risk of a surface-mount part.
Clamping voltages and the protection window
The reverse standoff voltage of 30.8 V is the maximum DC or AC peak voltage the diode can sit across without conducting leakage current. The breakdown voltage range starts at 34.2 V — that is where avalanche begins. Under a surge, the clamp holds at 49.9 V maximum. Power line protection is marked as No, which means this diode is not rated for continuous AC mains overvoltage — it is a transient suppressor, not a crowbar or a varistor. Use it on DC buses, signal lines, or low-frequency AC where the surge is a one-off event.