NRF52840 PCB

[Berkay Dudu]

Hi,

in the PCB circuit I marked in the pictures, it seems that vias have been added to the marked areas on the pads of the nRF52840. However, PCB manufacturers say that adding vias to the pads in this way can cause problems. Should we add vias to the pads when designing this PCB?

[helsing]

Hi Berkay,

"Via in pad" is often recommended for certain designs. For instance, when using the Wafer Level Chip Scale Package (WLCSP), it is recommended to use via capping to ensure good solderability when vias are used on a board with small pads https://docs.nordicsemi.com/bundle/nwp_050/page/WP/nwp_050/pcb_stackup.html#ariaid-title1). Capped via in pad is used in order to prevent solder paste from dissapearing down into the via.

Via-in-pad can be challenging. Please discuss this further with the PCB manufacturer and also see the related ticket:
https://devzone.nordicsemi.com/f/nordic-q-a/96530/nrf5340-aqfn94-pcb-trace-routing-for-inner-pads-via-in-pad?ReplyFilter=Answers&ReplySortBy=Answers&ReplySortOrder=Descending

[Berkay Dudu]

Thanks