u.fl and SMT MMCX - Githubissues

sinara-hw / Phaser

Quad channel 1GS/s RF generator card with dual IQ upconverter and dual 5MS/s ADC and FPGA in EEM form factor

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u.fl and SMT MMCX #86

Closed jordens closed 4 years ago

jordens commented 4 years ago

Are you confident the SMT MMCX are mechanically robust enough? IME SMT connectors are a reliability issue (see the typical micro-USB failures), especially if there are significant insertion/extraction forces. @gkasprow
If you are happy with the SMT MMCX, then I'd really use them for the debug connectors as well (J4A J4B)

gkasprow commented 4 years ago

they need vias that attach pads to inner layers and polygon above to be robust.

jordens commented 4 years ago

If that works I'm happy with it.

I thought you needed a pin or wing through the pcb together with its solder to protect from pad shear.

jordens commented 4 years ago

On the other hand that pretty much kills the notion of SMT connectors not piercing through all layers. The vias may actually make the effective footprint of a SMT connector larger than the through-hole style.

jordens commented 4 years ago

I'll leave the u.fl and MMCX connector style choice to you then.

gkasprow commented 4 years ago

I changed ufl to MMCX to reduce the BOM