nRF52840, what is different between WLCSP and QFN?

[Andy777]

nRF52840,  what is different between WLCSP and QFN?

Only footprint, and chip size?

what application is suitable for WLCSP and QFN?

[duncanw]

Hi Bulhar, Sorry for resurrecting such an old thread. Did you manage to find any suitable PCB suppliers? I find myself needing to design using the WLCSP package and anticipate similar issues.