A human-body ESD discharge delivers 2-15 kV in nanoseconds, with peak currents reaching 30 A for a level-4 contact discharge per IEC 61000-4-2. Without protection, that energy vaporizes bond wires, punctures gate oxides and silently degrades semiconductor junctions. A 50-cent TVS diode placed correctly is the difference between a product that surv…
A fuse is the cheapest insurance policy on a PCB. A 20-cent glass cartridge fuse that opens correctly saves a 200-euro power supply, a 50-euro microcontroller board and the fire investigation report. Selecting the right fuse means understanding time-current curves, I²t, breaking capacity and temperature derating.