Ideally, designers want their annular rings with holes located dead-center in order to get the best connection possible between the vias and the layers. The perfect width is the differen… See more

The width of the ring should be sufficiently thick to allow reliable electrical connection with via. The minimum length of the ring should be greater than or equal to the specified wi… See more

The via hole must be drilled at the absolute center of the pad to form the annular ring or the minimum width of the ring must be above the specified value. Misregistration of the via w… See more

The name “teardrop” is because of its shape. Teardrop pad is an extra feature that adds additional copper at the junction of annular rings with PCB traces. This shape can i… See more