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VGT is a requirement of the device, it’s the DC gate-cathode voltage that is present just prior to triggering when the gate current equals the DC trigger current. So, in other words, it is the minimum voltage required to ensure the thyristor fires. VGT(max) is the maximum manufacturing tolerance for the minimum value of VGT for a particular device. See more details in the datasheet, there’s a diagram of the safe operating area. In practice for a correct triggering the gate signal must exceed IGT and VGT requirements of the thyristor. So that’s why any good replacement must have lower values for IGT and VGT.
The two above examples can replace without any modification the outdated device…
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