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thyristor current rating is larger than BJT rating

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hamoksha

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why can thyristors be made to have lager current carrying capabilities in the on state than BJTs??/?
 

Without going into physics, it can be said that:

The maximum operating current of a thyristor is defined by the rate at which the device is cooled. Also, the thyristor can withstand very high surge currents within the capabilities of the cooling arrangements.

The bipolar transistor has no overcurrent capability - Ic cannot exceed Ic(max) - and this maximum operating current is defined by the gain, not by thermal considerations.

More on comparison between power semiconductors can be found at:
https://www.st.com/stonline/products/literature/an/3729.pdf

Regards,
IanP
 

    hamoksha

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