Definition
A solder bridge is an unwanted connection of solder spanning two or more conductors that are meant to be electrically isolated, such as adjacent IC pins, neighboring pads, or closely spaced traces. The result is a short circuit. Bridges are one of the most common defects on fine-pitch components, where the gaps between pins are measured in fractions of a millimeter.
Why bridges form
Excess solder is the usual culprit, often combined with too much heat, insufficient flux, or simply tight pad spacing that leaves little room for error. During hand soldering, dragging too much solder across a row of pins or letting the iron linger can pull a bridge between them. During reflow, excess paste, paste smear, or solder beading between connected pads can produce the same outcome.
Detection and removal
Many bridges are visible under magnification as a shiny strand or blob linking two points that should be separate, but the smallest ones hide between pins and are caught only by inspection or by a short reading across two nets. The standard removal technique is to add flux and wick the excess away with desoldering braid, or to reflow with a clean, well-tinned iron tip that carries the surplus solder off.
On mining boards a bridge across the right two points can prevent a chip chain from initializing or stress the power domain. Use solder wick with fresh flux to clear it, then verify the previously shorted nets read open with a multimeter.
In Simple Terms
A solder bridge is an unwanted connection of solder spanning two or more conductors that are meant to be electrically isolated, such as adjacent IC…