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Bulk Capacitance for iMX6 Designs

Question asked by markwilliams on Feb 27, 2019
Latest reply on Mar 13, 2019 by markwilliams

The iMX6 design guide recommends one 22uF capacitor for each of the _CAP power supplies, under the processor. Due to the tight space under the iMX6 processor ideally these caps would be 0402, however finding 22uF 0402 is proving difficult - they exist but seem to be rare, expensive and not available in the current capacitor market.


0603 are abundant in this value but I can't fit them under the processor in my design.


I looked at the Sabre AI design and the footprint follows the IPC standard for 0402 but the BOM lists these as 0603 caps? Are you able to place 0603 successfully on 0402 footprint? From quick glance it will fit, but not sure of the manufacturability?


While our board assembly house looks into the smallest 0603 footprint they could get away with, would it be possible to use 15uF for these positions as this is more widely available on 0402? Or are these _CAP pins exactly 22uF requirement?