![]() For example 2N3055 is a silicon NPN power transistor, 2N1301 is a PNP germanium switching transistor. The JEDEC EIA370 transistor device numbers usually start with "2N", indicating a three-terminal device (dual-gate field-effect transistors are four-terminal devices, so begin with 3N), then a 2, 3 or 4-digit sequential number with no significance as to device properties (although early devices with low numbers tend to be germanium). Gallium Arsenide Microwave power transistor (FET) ![]() Gallium Arsenide small-signal Microwave transistor (MESFET) Silicon, high voltage (for CRT horizontal deflection circuits) Silicon, high frequency, high power (for transmitters) Silicon, switching transistor (BJT or MOSFET) ![]() Silicon, small signal transistor ("allround") The more common prefixes are: Prefix class "C" often means high h FE, such as in: BC549C) or other codes may follow to show gain (e.g. Suffixes may be used, with a letter (e.g. With early devices this indicated the case type. A 3-digit sequence number (or one letter then 2 digits, for industrial types) follows. The Pro Electron part numbers begin 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.). ![]() standing for "Red", "Orange", "Blue" etc.) to denote variants, such as tighter h FE (gain) groupings. ![]() This series sometimes has suffixes (such as "R", "O", "BL". 2SD965, but sometimes the "2S" prefix is not marked on the package – a 2SD965 might only be marked "D965" a 2SC1815 might be listed by a supplier as simply "C1815". The Japanese Industrial Standard (JIS) JIS-C-7012 standard for transistor part numbers starts with "2S", e.g. There are three major semiconductor naming standards in each the alphanumeric prefix provides clues to type of the device. The types of some transistors can be parsed from the part number. ![]()
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