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RTC Crystal place is exposed on the STM32F4-Discovery board. So which kind of 32.768 KHz SMD Crystals is proper for that place? Could you give a part number or a link to buy?

enter image description here

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    \$\begingroup\$ The User Guide for your board recommends a MC306-G-06Q-32.768. Don't forget to also fit R21, R22, C16 & C27 too. \$\endgroup\$ – brhans Oct 30 '18 at 0:04
  • \$\begingroup\$ The datasheet for that board or the datasheet for the CPU should have all those details. It is more for a date/time clock than a RTC, which can be done by using a timer. A RTC is not always 1HZ. It can be 1KHZ/1MHZ/1GHZ. \$\endgroup\$ – Sparky256 Oct 30 '18 at 0:06
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    \$\begingroup\$ @brhans. You could post that comment as a valid answer. \$\endgroup\$ – Sparky256 Oct 30 '18 at 2:12
  • \$\begingroup\$ @brhans I agree with Sparky. I use that board and your comment added to my knowledge base. \$\endgroup\$ – StainlessSteelRat Oct 30 '18 at 13:25
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The User Guide for your board recommends a MC306-G-06Q-32.768.
I referred to the schematic on page 28:
enter image description here Don't forget to also fit R21, R22, C16 & C27 too.

If you choose a different crystal to use, make sure you check that crystal's datasheet for the appropriate capacitance values to use for C16 & C27.

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