5 PCB Parameters That Make or Break Your Board’s Performance

Wondering why some PCBs work flawlessly in high-speed devices while others fizzle out? The secret lies in five core parameters that make or break performance—no confusing tech talk required.

First up: Dielectric Constant (DK). It measures a material’s ability to store electrical energy; lower DK means faster signal transmission (critical for 5G or high-speed gear). Next is Tg (Glass Transition Temperature): the threshold where a PCB substrate shifts from rigid “glassy” to flexible “rubbery” state. Higher Tg equals better heat resistance for tough environments.

Then there’s CTI (Comparative Tracking Index), your go-to for insulation quality—bigger numbers mean less risk of electrical leakage. TD (Thermal Decomposition Temperature) tells you how much heat a board can take before breaking down, a must for power-dense applications. Last is Z-axis CTE: this tracks how a PCB expands when heated, with smaller values preventing warping in extreme temperatures.

These five specs aren’t just numbers—they’re the backbone of every reliable PCB. Keep them in mind, and you’ll pick the right board for any project.