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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
Fuses shall be rated for at least 25% higher than what the application requires.
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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.
Schematic
Decoupling
IC decoupling shall be achieved by a minimum of one 0.1uF MLCC capacitor per power pin. Additional decoupling shall be added if warranted by the application, such as in high power devices. The datasheet will generally have recommended decoupling schemes. It is acceptable to round decoupling cap values to nicer numbers, ie 0.47uF to 1uF. Be weary of excessive capacitance resulting in inrush current.
Thermistors
The standard thermistor has a 10k value and is situated on the low side.
PCB
Mounting
The M2.5 hex standoff component shall be used to PCB mounting homes. The hole shall be 2.7mm in diameter, with a keep-out area 6mm in diameter. Mounting holes shall be low voltage ground where applicable.
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