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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 ...
These handling difficulties prompted development of alternative SMT packages for common MELF components (like diodes) where the power handling capability needed to be similar to MELF components (superior to low-power 0805/0603, etc. SMT components) but with improved automated pick-and-place handling characteristics. [3]
Different manufacturers use different names for this package: ML (micro-leadframe) versus FN (flat no-lead), in addition there are versions with pads on all four sides (quad) and pads on just two sides (dual), thickness varying between 0.9–1.0 mm for normal packages and 0.4 mm for extremely thin. Abbreviations include:
The small rectangular chips with numbers are resistors, while the unmarked small rectangular chips are capacitors. The capacitors and resistors pictured are 0603 (1608 metric) package sizes, along with a very slightly larger 0805 (2012 metric) ferrite bead. Surface-mount capacitor A MOSFET, placed upon a British postage stamp for size comparison.
SOD-123 package. Small Outline Diode (SOD) is a designation for a group of semiconductor packages for surface mounted diodes.The standard includes multiple variants such as SOD-123, SOD-323, SOD-523 and SOD-923. [1]
Some TSSOP packages have an exposed pad. This is a rectangular metal pad on the bottom side of the package. The exposed pad will be soldered on the PCB to transfer heat from the package to the PCB. In most applications, the exposed pad is connected to ground. [2]
The exposed pad (EP) variant of small outline packages can increase heat dissipation by as much as 1.5 times over a standard TSSOP, [citation needed] thereby expanding the margin of operating parameters. Additionally, the exposed pad can be connected to ground, thereby reducing loop inductance for high-frequency applications.
HTSOP (Heatsink TSOP) is a variant of TSOP with an exposed pad on the bottom side. [ citation needed ] The pad is soldered to the PCB to transfer heat from the package to the PCB. Similar packages