teardrop (electronics)

The main purpose of teardrops is to enhance structural integrity in presence of thermal or mechanical stresses, for example due to vibration or flexing.{{Cite web |last=Ruth |date=2023-04-28 |title=Introduction to high speed PCB and is it same as high frequency PCB |url=https://www.pcbaaa.com/an-ultimate-introduction-to-high-speed-pcb-and-is-it-same-as-high-frequency-pcb/ |access-date=2023-05-01 |publisher=IBE Electronics }} Structural integrity may be compromised, e.g., by misalignment during drilling, so that too much copper may be removed by the drill hole in the area where a trace connects to the pad or via. An extra advantage is the enlarging of manufacturing tolerances, making manufacturing easier and cheaper.

{{anchor|Filleting|Straight|Concave|Snowman}}

While a typical shape of a teardrop is straight-line tapering, they may be concave. This type of teardrop is also called filleting or straight. To produce a snowman-shaped teardrop, a secondary pad of smaller size is added at the junction overlapping with the primary pad (hence the nickname).

{{See also|Necking (engineering)}}

For similar reasons, a technique called trace necking reduces (or necks down) the width of a trace that approaches a narrower pad of a surface-mounted device or a through-hole with a diameter that is less than the width of the trace, or when the trace passes through bottlenecks (for example, between the pads of a component).

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Category:Printed circuit board manufacturing