The Pro Electron standard, the European Electronic Component Manufacturers Association part numbering scheme, begins with two letters: the first gives the semiconductor type (A for germanium, B for silicon, and C for materials like GaAs); the second letter denotes the intended use (A for diode, C for general-purpose transistor, etc.). A 3-digit sequence number (or one letter then 2 digits, for industrial types) follows. With early devices this indicated the case type. Suffixes may be used, with a letter (e.g. "C" often means high hFE, such as in: BC549C) or other codes may follow to show gain (e.g. BC327-25) or voltage rating (e.g. BUK854-800A). The more common prefixes are:
The Pro Electron standard , the European Electronic Component Manufacturers Association part numbering scheme , begins with two letters : the first gives the semiconductor type ( A for germanium , B for silicon , and C for materials like GaAs ) ; the second letter denotes the intended use ( A for diode , C for general - purpose transistor , etc . ) . A 3-digit sequence number ( or one letter then 2 digits , for industrial types ) follows . With early devices this indicated the case type . Suffixes may be used , with a letter ( e.g. " C " often means high hFE , such as in : BC549C ) or other codes may follow to show gain ( e.g. BC327 - 25 ) or voltage rating ( e.g. BUK854 - 800A ) . The more common prefixes are :
What is the second letter in the part numbering scheme?
What is the second letter in the part numbering scheme ?
the intended use
the intended use