The 1.5KE6V8A-B is officially obsolete per Diodes Incorporated's product status.
Key ratings and what they mean for circuit protection
The 5.8 V reverse standoff voltage means it holds off normal DC bias up to that level without conducting, clamping at 10.5 V maximum when hit with a 143 A peak pulse current — the clamp voltage is the ceiling the protected circuitry sees during a surge.
DO-201 axial package — board-fit note
Housed in a DO-201AA (DO-27) axial-lead through-hole package, the 1.5KE6V8A-B mounts into a 0.052-inch (1.3 mm) diameter hole on a standard PCB or terminal block. The axial form factor is common in legacy and high-reliability designs where surface-mount soldering is not preferred or where the board sees mechanical stress that would crack a SMD package. Supplied in bulk — no tape-and-reel, so hand-insertion or tube-fed assembly is the expected process.