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Surface-mount resistors delaminating where dissimilar materials join, like between the ceramic substrate and the resistive layer. [21] Nichrome thin-film resistors in integrated circuits attacked by phosphorus from the passivation glass, corroding them and increasing their resistance. [22]
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 ).
Silver whiskers growing out of surface-mount resistors Metal whiskering is a phenomenon that occurs in electrical devices when metals form long whisker-like projections over time. Tin whiskers were noticed and documented in the vacuum tube era of electronics early in the 20th century in equipment that used pure, or almost pure, tin solder in ...
There can also be failure of resistors due to mechanical stress and adverse environmental factors including humidity. If not enclosed, wirewound resistors can corrode. Surface mount resistors have been known to fail due to the ingress of sulfur into the internal makeup of the resistor.
In surface-mount technology (SMT), the component is placed on the PCB so that the pins line up with the conductive pads or lands on the surfaces of the PCB; solder paste, which was previously applied to the pads, holds the components in place temporarily; if surface-mount components are applied to both sides of the board, the bottom-side ...
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.
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 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.
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