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Understanding Extra PCB Soldering Pads

IoT & Hardware intermediate 4 min read $0.01 Updated 2026-07-31

What the unlabeled extra solder pads on a PCB are for: test points for probing signals, in-circuit programming interfaces (UART/SWD/JTAG), JTAG boundary-scan testing, component replacement/rework and design-variant population, and access points for factory calibration.

Ever opened a device and found solder pads that connect to nothing obvious? This guide explains what those extra PCB pads are for — test points, in-circuit programming, boundary-scan testing, component rework, and factory calibration.

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#pcb#soldering#test-points#jtag#electronics

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