Surface Mount (SMD) Component Packages. Reference data

Encyclopedia of radio electronics and electrical engineering / Reference materials

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Despite the large number of standards that regulate the requirements for housings of electronic components, many companies produce elements in housings that do not meet international standards. There are also situations when a body that has standard dimensions has a non-standard name.

Often the case name consists of four digits that represent its length and width. But in some standards, these parameters are set in inches, while in others - in millimeters. For example, the case name 0805 is 0805 = length x width = (0.08 x 0.05) inches, while the 5845 case is (5.8 x 4.5) mm. Cases with the same name may have different heights, different contact pads and are made of different materials, but are designed for mounting on a standard mounting location. Below are the dimensions in millimeters of the most popular enclosure types.

* Depending on the technologies that the company has, the normalized spreads relative to the basic dimensions also vary. The most common tolerances are: ±0.05 mm - for cases up to 1 mm long, for example 0402; ±0.1 mm - up to 2 mm, for example SOD-323; ±0.2 mm - up to 5 mm; ±0.5 mm - over 5 mm. Small discrepancies in sizes between different companies are due to varying degrees of accuracy in converting inches to mm, as well as indicating only min, max or nominal size.

** Cases with the same name may have different heights. This is due to: for capacitors - the capacitance and operating voltage, for resistors - power dissipation, etc.

Publication: cxem.net

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