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The 2N170 was priced slightly higher than the 2N107. The 2N170 was a fallout from the 2N167, 2N168 and 2N169 transistor lines. In the 1950s, General Electric distinguished their PNP and NPN transistors by their case styles. PNP transistors had the round, black "top hat" style body, while NPN transistors had oval, black "top hats".
The 2N3904 is a common NPN bipolar junction transistor used for general-purpose low-power amplifying or switching applications. [1] [2] [3] It is designed for low current and power, medium voltage, and can operate at moderately high speeds. It is complementary to the 2N3906 PNP transistor. Both types were registered by Motorola Semiconductor in ...
The 2N3055 is a silicon NPN power transistor intended for general purpose applications. It was introduced in the early 1960s by RCA using a hometaxial power transistor process, transitioned to an epitaxial base in the mid-1970s. [1]
Size comparison of BJT transistor packages, from left to right: SOT-23, TO-92, TO-126, TO-3. The case is molded around the transistor elements in two parts; the face is flat, usually bearing a machine-printed part number (some early examples had the part number printed on the top surface instead). The back is semi-circularly-shaped.
BC108 family transistors from various manufacturers (ITT, CEMI, SGS-ATES, Siemens)The BC107, BC108 and BC109 are general-purpose low power silicon NPN bipolar junction transistors found very often in equipment and electronics books/articles from Europe, Australia [1] and many other countries from the 1960s.
The 2N2222 is considered a very common transistor, [1] [2] [3] and is used as an exemplar of an NPN transistor. It is frequently used as a small-signal transistor, [4] [5] and it remains a small general purpose transistor [6] of enduring popularity. [7] [8] [9] The 2N2222 was part of a family of devices described by Motorola at a 1962 IRE ...