Protected Mosfet

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A protected MOSFET contains integrated transient surge protection circuitry (a source-drain zener) and is less susceptible to electrostatic discharge and other transients, as compared to standard, unprotected MOSFETs.

A "intelligent switch" contains, in addition, an integrated temperature sensor, and automatically turns itself off if it gets too hot. [1] [2] [3]

Examples of MOSFETS (most are protected) in RepRap electronics are:

Electronics MOSFET Part Number Notes
RAMPS STMicroelectronics
STripFETTM II Power MOSFET -- Integrated source-drain zener
Pololu Electronics STMicroelectronics
MOSFET OMNIFETII 40V 12A 0.02 ohm TO-220 -- Thermal, short, overvoltage, feedback, ESD
R2C2 electronics Unprotected MOSFETS External protection provided on board with zeners
Generation 7 Electronics International Rectifier
30V 78A 0.0032 ohm, internal zeners, for heated bed (no heatsink with low freq PWM) (See Gen7_Research#MOSFET_Heat_and_MOSFET_Type
International Rectifier
55V 49A 0.017 ohm, internal zeners, for extruder
Sanguinololu Fairchild
30A, 60V, ESD Rated, 0.047 Ohm, Logic Features

Level N-Channel Power MOSFETs -- 2KV esd, integrated source-drain zener, integrated gate-source zeners

SevenSwitch International Rectifier
30V 78A 0.0032 ohm, internal zeners