Analog Electronics
Optocouplers combine

 IGBTs and MOSFETs.
 Power transistor and silicon transistor.
  Infrared light emitting diode and a silicon photo transistor.
 SITs and BJTs.

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Analog Electronics
The magnitude of electric current ICBO

  is generally greater in silicon than in germanium transistor.
  depends largely upon the emitter doping.
  increases with the increase in temperature.
  depends largely upon emitter-base junction base potential.

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