Understanding FET Maximum Ratings: DC vs Pulsed Drain Current

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SUMMARY

The discussion focuses on the maximum ratings of Field Effect Transistors (FETs), specifically the differences between DC drain current and pulsed drain current. DC drain current represents the continuous current a FET can handle, which is significantly lower than the pulsed drain current due to the reduced duty cycle. It is crucial to consider factors such as wire bonding limitations and instantaneous temperature spikes when designing circuits that utilize these ratings, as they can affect performance and reliability.

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  • Understanding of FET specifications and datasheets
  • Knowledge of electrical power ratings
  • Familiarity with duty cycle concepts
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Physicslearner500039
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Hi All,

i have seen the following parameter in FET data sheet in the maximum ratings column
DC drain current, Pulsed. What does this parameter represent? In my design how should I take care of this? Could someone please explain me this?

Thanks in advance,

Regards,
Satya
 
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It is power rating. DC current rating is a lot lower because it is continuous. Pulse current is higher because the duty cycle is much lower.

But you cannot count on the average power or the average current from the pulse can be the same as DC power. Because there might be limitation of the wire bonding, instantaneous temperature spike or other factors inside the FET.
 
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