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    Gate turn-off thyristors (GTO)

    Gate turn-off thyristors (GTO)

    Production of GTOs commenced in the mid 1980s. A GTO is a thyristor that can be turned off by applying a current to the gate in the reverse direction to that required to turn it on.


    GTOs are optimized for low conduction losses. The typical on-off switching frequency is in the range of 200 - 500 hertz for most applications. GTOs are, by nature, relatively slow switches.
    Typical transition times from on to off state and vice versa are in a range of 10 - 30 microseconds. All GTOs require protective networks called "snubbers" for turn-on and turn-off. The turn-on snubber circuit, in essence an inductor, limits the rate of current rise. For turn-off, the GTO requires a device that limits the rate of voltage rise, in essence a capacitor.
    All ABB GTOs are press-pack devices. They are pressed with a relatively high force onto heat-sinks which also serve as electrical contacts to the power terminals.

    Asymmetric GTOs are divided in two categories: Buffer layer and Standard. Buffer layer GTOs have exceptionally low on-state and dynamic losses. Fine pattern types (5SGF) are optimised for fast switching and transparent emitter (5SGT) for low on-state losses. The Standard GTOs have excellent trade-off between on-state and switching losses.

    Part NumberVDRM (V)VDC (V)ITGQM  @  Cs(A)ITGQM  @  Cs(μF)Package* (mm)
    Standard
    5SGA 15F2502250014001500375/47
    5SGA 20H2501250014002000493/63
    5SGA 25H2501250014002500693/63
    5SGA 30J25012500140030005108/75
    5SGA 06D450245002800600158/34
    5SGA 20H4502450022002000493/63
    5SGA 30J45024500280030006108/75
    5SGA 40L45014500280040006120/85

    *Note: Pole-piece diameter / Housing height
     

    Part NumberVDRM (V)VDC (V)ITGQM @
    Cs (A)
    ITGQM @ Cs(μF)Package* (mm)
    Buffer layer
    5SGF 30J45024500300030003108/75
    5SGF 40L45024500280040006120/85

    *Note: Pole-piece diameter / Housing height 


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