1500W Zener TVS — what the ratings mean for the BOM
The 1.5KE68A-B: That power rating is the energy-handling ceiling for a single transient event; the device absorbs the surge and clamps the line at 92 V max. With a 58.1 V reverse standoff voltage, this part protects 48 V nominal rails or 48 V battery buses where the steady-state operating voltage stays below that threshold. The breakdown voltage range starts at 64.6 V min, so the TVS remains transparent until a transient pushes the line above that point.
Obsolete — sourcing and lifecycle reality
Diodes Incorporated lists the 1.5KE68A-B as obsolete. Because the part is obsolete, a buyer should verify the date code and storage conditions of any available stock to ensure the solderability and moisture sensitivity remain within acceptable limits.
Temperature grade and deployment context
Rated for continuous junction temperature from -55°C to 175°C, the 1.5KE68A-B covers the full industrial and automotive ambient range. The 175°C upper limit means it can sit next to a hot power supply or in an engine bay without derating the junction temperature margin. The through-hole DO-201 package is suited for point-of-use transient suppression on power input lines, DC bus rails, or relay coil snubber circuits where a surface-mount TVS would risk solder joint fatigue under thermal cycling.