I have an old FOX oscillator and need to get a replacement to the part FXO-HC736R-1.000000.
The newer devices are configurable from the factory at no charge to you. https://www.renesas.com/us/en/products/clocks-timing/crystal-oscillators/xl-1000fs-quartz-based-pll-oscillator
You can use this…
You can use this link to configure your device and obtain a new ordering code: https://www.renesas.com/us/en/buy-sample/customize/123676
This document is the FOX to IDT cross-reference information: Fox XpressO to IDT Part Number Cross Reference