Harnessing

Connectors

Type

Molex 3mm Microfit

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TVS diodes are suitable for high instantaneous current, such as ESD or other forms of transient voltage suppression. Zener diodes have more precise breakdown thresholds, and are suitable for handling continuous reverse current such as for voltage regulation.

Fuses

Package

Current Rating

Voltage(V_AC and V_DC)

The voltage rating that you see coupled with the specification of a fuse is also very important. This is the maximum voltage that the fuse can safely operate at when a overcurrent situation happens. Voltage rating of the fuse(whether AC or DC) must ALWAYS be higher than the voltage present on the circuit. Otherwise the risk of arcing(when voltage exists on contacts separated by a small gap that could cause an electric discharge across the gap)increases.

i.e. 600V_AC Fuse on a circuit using 250V_AC Fuse should be fine, but not the other way around!

Time Current Characteristics(I²t)

FETs

Current

The rated current shall be at least double the expected application. The maximum current is typically defined by the thermal limit of how much heat the part can handle due to IR losses. Note that especially for high current FETs, the max current is given for specific conditions, often at a case (surface) temperature (Tc) of 25C. In reality, it is not realistic to keep the surface of the part at 25C under full load, as this would require sub ambient cooling. Thus, appropriate component derating must be performed.

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