I'm trying to reflow a custom shaped strip onto a PCB, but I'm unsure about what size pad I need on the PCB.
- The strip is 13mm x 6mm x 0.3mm.
- The PCB surface finish is ENIG.
- The pad is likely to be mask defined (because of thermal transfer, and helping to prevent the pad from getting pulled off the PCB). I don't think this last point is relevant to my question, but maybe it is.
Can the PCB pad exactly match the 13mm x 6mm x 0.3mm strip, or does it need to be slightly larger to allow solder to form that concave fillet around the edges? What would happen if the pad exactly matches the pad size?