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Transistor and diode numbering systems- the Pro-electron and JEDEC numbering systems for semiconductors
There are two main numbering systems for semiconductor diodes, transistors and FETs. One numbering or code system is used more widely in Europe and the other in the USA. The European based system is known as the Pro-electron (Proelectron) system, and the one used more widely in North America is the JEDEC system. The numbers using the Pro-electron and JEDEC systems have different formats as seen below: Pro-Electron Numbering or Coding System
From this it can be seen that a BC109 is a low power audio transistor and a BBY13 is variable capacitance diode for industrial or commercial use. JEDEC Numbering or Coding System
Thus a 1N914 is a diode and a 2N706 is a transistor.
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