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An electrical component mounted in this manner is referred to as a surface-mount device (SMD). In industry, this approach has largely replaced through-hole technology construction method of fitting components, in large part because SMT allows for increased manufacturing automation which reduces cost and improves quality. [ 3 ]
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 ...
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A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.
Discrete transistors can be individually packaged transistors or unpackaged transistor chips. Transistors come in many different semiconductor packages (see image). The two main categories are through-hole (or leaded ), and surface-mount , also known as surface-mount device ( SMD ).
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.