Where to source a 5.08mm lead pitch crystal for Nucleo-64 board

[Adam Hamilton]

I am finding it difficult to source an external crystal for the Nucleo-64 board (The F103RB). The footprint for the X3 crystal calls for a lead pitch of 5.08mm however this seems to be very uncommon. Most of the crystals out there specifiy a lead pitch of 4.88.

Now, looking at the user guide for the Nucleo-64 boards, it mentions a part from HongKong crystal, 9SL8000016AFXHF0, which is:

1. Not useful for me as I want to be able to use a different frequency crystal
2. The actual datasheet for that HongKong crystal specifies the lead pitch as 4.88mm :astonished_face:

Perhaps there an updated PCB design that has not made its way into the CAD resources section of the Nucleo-64 product page for the Nucleo F103RB?

[TDK]

The HC49 package has 4.88mm nominal lead distance with a ± 0.2mm or so tolerance. I doubt you will find nominal 5.08mm crystals, but the standard package should fit in the footprint, even if it is slightly off.

[Adam Hamilton]

Thank you for such a quick reply. My search also yielded nothing, except for a single oscillator with a lead pitch of 5.08mm.

As a former PCB designer, this would have been an absolute no-no for a PCB design to specify a foot print of 5.08mm and having a "she'll be right" approach.

Anyway, I would hope the ST guys out there might find some time to update the PCB footprints

[Mike_ST · Accepted solution]

Hello,

As an HC-49 crystal can easily be inserted by hand on the Nucleo board, even with this 5.08mm spacing, I guess nobody really encountered a problem before.

I entered a ticket, but, the design is "old", and I don't think there will be an update.

[Tesla DeLorean]

Very old board, no one is going to revisit, and some of the newer NUCLEO-64's have entirely different footprint for the crystals, moving to surface mount

[Adam Hamilton]

Thanks Mike for entering that ticket however, like you said it probably won't be looked into.

It's just a pet peeve of mine that something like this would have gone through a PCB review and overlooked.

Anyway I have bought up some HC-49 crystals so we'll see how it goes.

Cheers for the all the help