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The BC548 is a part of a family of NPN and PNP epitaxial silicon transistors that originated with the metal-cased BC108 family of transistors.The BC548 is the modern plastic-packaged BC108; [6] the BC548 article at the Radiomuseum website [7] describes the BC548 as a successor to the BC238 and differing from the BC108 in only the shape of the package.
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.
A typical use of these transistors is as a switch for moderate voltages and currents, including as drivers for small lamps, motors, and relays. [1] In switching circuits, these FETs can be used much like bipolar junction transistors, but have some advantages: high input impedance of the insulated gate means almost no gate current is required
Silicon, small-signal transistor ("allround" or "G.P.") BC183LB: the "L" indicates Base-Collector-Emitter pinout while the "B" suffix indicates medium gain (240-500 h FE) selection BC: Silicon, small-signal transistor: BC337-25-25 indicates an h FE of around 250 (140-400 range) BD: Silicon Darlington-pair power transistor: BDT60B
The bipolar junction transistor, the first type of transistor to be mass-produced, is a combination of two junction diodes and is formed of either a thin layer of p-type semiconductor sandwiched between two n-type semiconductors (an n–p–n transistor), or a thin layer of n-type semiconductor sandwiched between two p-type semiconductors (a p ...
Illustration of safe operating area of a bipolar power transistor. Any combination of collector current and voltage below the line can be tolerated by the transistor. SOA is usually presented in transistor datasheets as a graph with V CE (collector-emitter voltage) on the abscissa and I CE (collector-emitter current) on the ordinate ; the safe ...