How to Choose a Replacement Transistor

Electus Distribution has published a short article on how to choose a substitute transistor. According to the article, you need to consider the application and the transistor’s basic characteristics, including:

  • whether it’s germanium (Ge) or silicon (Si);
  • NPN or PNP;
  • high power or low power;
  • designed for linear amplification or switching; and
  • low noise or not.

Also, note its main performance parameters, including:

  • voltage breakdown rating (usually Vcemax or BVceo);
  • current gain (beta or hFE) at the likely collector current; and
  • upper frequency limit (fT or Fmax).

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