680 µF, 4 V, 23 mOhm — bulk decoupling for a tight rail
The 23 mOhm ESR is the headline number — it tells you the ripple current handling and the self-heating under load. For a 4 V rail feeding a 1.8 V LDO or a POL converter, this cap absorbs the switching ripple without cooking itself.
Full military temperature range — avionics and downhole ready
It is at home in an engine control unit on the hot side of a firewall, a satellite power bus in LEO thermal cycling, or a downhole tool that sees 125 °C at the bottom of a well. The molded case keeps the package stable across that swing — no conformal-coat issues, no moisture ingress worries if the board gets a proper bake before assembly.
No last-time-buy notice, no successor to chase. You can design this into a new BOM today and expect it to be available for the next several production runs.