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Surface-mount technology (SMT), originally called planar mounting, [1] is a method in which the electrical components are mounted directly onto the surface of a printed circuit board (PCB). [2] An electrical component mounted in this manner is referred to as a surface-mount device (SMD). In industry, this approach has largely replaced the ...
BC548. The BC548 is a general-purpose NPN bipolar junction transistor commonly used in European and American electronic equipment. It is notably often the first type of bipolar transistor hobbyists encounter and is often featured in designs in hobby electronics magazines where a general-purpose transistor is required. [1][2][3] The BC548 is low ...
The metric codes still represent the dimensions in mm, even though the imperial size codes are no longer aligned. Problematically, some manufacturers are developing metric 0201 components with dimensions of 0.25 mm × 0.125 mm (0.0098 in × 0.0049 in), [ 31 ] but the imperial 01005 name is already being used for the 0.4 mm × 0.2 mm (0.0157 in ...
BC108 family. 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. They were created by Philips and Mullard in 1963 and introduced in April 1966.
A transistor is a semiconductor device used to amplify or switch electrical signals and power. It is one of the basic building blocks of modern electronics. [1] It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit.
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.
TO-263. The Double Decawatt Package, [ 1 ][ 2 ]D2PAK, SOT404 or DDPAK, standardized as TO-263, [ 3 ] is a semiconductor package type intended for surface mounting on circuit boards. The TO-263 is designed by Motorola. [ 1 ][ 2 ] They are similar to the earlier TO-220 -style packages intended for high power dissipation [ 2 ][ 4 ] but lack the ...
A 2N3904 (lower left) in a TO-92 package on a breadboard. 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.