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The two-transistor model of the SCR can be obtained by

  • The two-transistor model of the SCR can be obtained by Bisecting the SCRs top two and bottom two layers.
  • The two-transistor model of the SCR is a simplified model that represents the SCR as two interconnected transistors.
  • The base-emitter junction of one transistor is connected in parallel with the collector-base junction of the other transistor, and the resulting structure is referred to as the "npn-pnp" structure.
  • This model is obtained by assuming that the two transistors inside the SCR are well-matched and that the emitter current of one transistor is equal to the collector current of the other transistor.
  • It is a simplification of the actual physical structure of the SCR, which consists of multiple layers of p-type and n-type semiconductors.