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Is this FET tube static safe?

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cupoftea

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Hi,
These FETs are 600V (SiHG186N60). The tube is clear plastic , from Farnell.
I thought all ESD safe plastics were tinted red or pink?
 

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If you look hard, they are not clear but slightly gray. You can add any color to the plastic but the conductivity is determined by the small amount of carbon powder added to the plastic.

To be effective ESD safe, the conductivity should not be too low or too high. Wise men have decided some reasonable value (but you still cannot use your DMM to measure it) and the clear tubes are actually very light gray.
 

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