STM32F446 & External Oscillator
Her's Digikey selection filter for a quartz crystal working at 25 MHz with frequency stability of +/- 10 ppm which is very good:
https://www.digikey.com/en/products/filter/crystals/171?s=N4IgjCBcoKwMwHYqgMZQC4CcCuBTANCAPZQDa4cAnABwgC6hADulCAMpYCWAdgOYgBfQgCYwMAAzIQaSFjyESkcsJgACALIAJAF70mLSCACq3TugDyAM3W4AhgGdsmXIIECgA