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Thick film resistors became popular during the 1970s, and most SMD (surface mount device) resistors today are of this type. The resistive element of thick films is 1000 times thicker than thin films, [ 7 ] but the principal difference is how the film is applied to the cylinder (axial resistors) or the surface (SMD resistors).
The same effect is obtained whether the laser changes a thick-film or a thin-film resistor on a ceramic substrate or a surface-mount resistor. The surface-mount resistor is produced with the same technology and may be laser trimmed as well. Trimmable chip capacitors are built up as multilayer plate capacitors.
Sheet resistance is a special case of resistivity for a uniform sheet thickness. Commonly, resistivity (also known as bulk resistivity, specific electrical resistivity, or volume resistivity) is in units of Ω·m, which is more completely stated in units of Ω·m 2 /m (Ω·area/length).
Various resistor types of different shapes and sizes. A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
Surface-mount zero-ohm resistors are usually marked with a single or multiple "0" (if size allows marking), where the number of digits can indicate the tolerance or maximum resistance rating, as is the case with regular resistors. [3] They are often implemented as thick film resistors.
Metal electrode leadless face (MELF) is a type of leadless cylindrical electronic surface mount device package with metal end terminals. Diodes and resistors are the most common MELF devices. [1] The EN 140401-803 and JEDEC DO-213 standards describe multiple MELF components. [2]
Surface mount components, including resistors, transistors and an integrated circuit A PCB in a computer mouse: the component side (left) and the printed side (right) "Through hole" components are mounted by their wire leads passing through the board and soldered to traces on the other side.
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 ]
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