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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).
Carbon composition resistors can exhibit a noise index of 0 dB while bulk metal foil resistors may have a noise index of −40 dB, usually making the excess noise of metal foil resistors insignificant. [39] Thin film surface mount resistors typically have lower noise and better thermal stability than thick film surface mount resistors.
Resistor based on the sheet resistance of carbon film. Sheet resistance is the resistance of a square piece of a thin material with contacts made to two opposite sides of the square. [1] It is usually a measurement of electrical resistance of thin films that are uniform in thickness.
The same effect is obtained whether the laser changes a thick-film or a thin-film resistor on a ceramic substrate or an 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.
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 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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