As in the pictures, they use different designs (current rate, voltage rate etc. are same.)

What is difference between these two designs?

Thyristor 1

Thyristor 2


1 Answer 1


As long as the device engages in a "regular" way (at the maximum possible di / dt, minimal dv/dt) and gradually on all the available surface the current it does not really matter. All the "arrangements" are allowed.

The only way to know which is the better "figure" is the "thermal" behavior of the device, shown with IR cameras.

It would be interesting to have "notes" from manufacturers about the "migrations" of impurities which can also have a certain influence on the "life" of the component (and possible destruction) and that the "design" of the connections makes it possible to minimize these "displacements" by "driving" these impurities into "non-essential areas".

See the conclusion (in french) of this "old" note : https://hal.archives-ouvertes.fr/jpa-00217349/document

EDIT : Incidentally, I came across this note ... Infineon Triggering ETT

See paragraph 2.2 for what is called "amplifying gate" ... And conclusion 2.4.

  • 1
    \$\begingroup\$ The word you want is thermal. \$\endgroup\$
    – Hearth
    Oct 1, 2021 at 13:24
  • 1
    \$\begingroup\$ @Hearth JRE ... Yes. Right. I update it. \$\endgroup\$
    – Antonio51
    Oct 1, 2021 at 13:38
  • \$\begingroup\$ Thank you for details. In Infineon docs, ,it says for amplifying gate is more immune to soft firing at Page 6. What does it mean ? \$\endgroup\$
    – Nott
    Oct 4, 2021 at 11:51
  • \$\begingroup\$ @Nott I think, but I am not absolutely sure, that "soft firing" corresponds to the possibility of activating the ETT by a weak trigger current as it is possible to do with the first generation thyristors. It was supplied, indeed with these, a diagram of "command" for the trigger "Voltage .vs. Current" (with the limitations of max voltage, max current, hyperbolas Max power .vs. Duty cycle. \$\endgroup\$
    – Antonio51
    Oct 4, 2021 at 12:13
  • 1
    \$\begingroup\$ @Nott See also 3.5 in the infineon doc. \$\endgroup\$
    – Antonio51
    Oct 4, 2021 at 12:23

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