STM32H723ZGT6 + LAN8742AI - > PHY CRYSTAL PART SELECTION GUIDEANCE
Hi STM Team,
We are currently using the 25 MHz crystal configuration based on the NUCLEO-H723ZG reference design for our STM32H723 + LAN8742 Ethernet implementation.
The original/reference crystal used is:
NX2016SA 25 MHz – EXS00A-CS11321 (NDK)
- Frequency: 25 MHz
- Load capacitance (CL): 6 pF
- ESR: 80 Ω
- Reference design uses approximately 5.1/5.6 pF load capacitors.
However, the above crystal is currently not readily available in the market, so we evaluated the following alternatives:
- ECS-250-6-37-JTN-TR – 25 MHz, 6 pF, 80 Ω
- X2C025000DZ1H-U
- XRCGB25M000F1SBAR0
With the above replacement crystals, we are observing significant data loss during Ethernet communication through the LAN8742.
We have already tried the recommended/reference crystal configuration and compared the Ethernet behavior with the replacement crystals, but the issue is still observed with the alternate parts.
Could you please help us identify a suitable 25 MHz crystal for the STM32H723 + LAN8742 configuration, preferably a currently available part that is electrically compatible with the original NX2016SA EXS00A-CS11321?
Also, please advise if any load capacitor value, series resistor, drive-level, or other oscillator configuration needs to be changed when using an alternative crystal.
Your recommendation for a qualified/validated replacement part would help us proceed with the design.
Thanks.
