Flat No Lead Cross Section
The figure shows the cross section of a Flat No lead package with a lead frame and wire bonding. There are two types of body designs, punch singulation and saw singulation. Saw singulation cuts a large set of packages in parts. In punch singulation, a single package is moulded into shape. The cross section shows a saw-singulated body with an attached thermal head pad. The lead frame is made of copper alloy and a thermally conductive adhesive is used for attaching the silicon die to the thermal pad. The silicon die is electrically connected to the lead frame by 1-2 mil diameter gold wires.
The pads of a saw-singulated package can either be completely under the package, or they can fold around the edge of the package.
Read more about this topic: Quad-flat No-leads Package
Famous quotes containing the words flat, lead, cross and/or section:
“Castaway, your time is a flat sea that doesn’t stop,
with no new land to make for and no new stories to swap.”
—Anne Sexton (1928–1974)
“We shall do better to abandon the whole attempt to learn the truth ... unless we can trust to the human mind’s having such a power of guessing right that before very many hypotheses shall have been tried, intelligent guessing may be expected to lead us to one which will support all tests, leaving the vast majority of possible hypotheses unexamined.”
—Charles S. Pierce (1839–1914)
“Never expect any recognition here—the system prohibits it. The cross is not affixed to the genius, no, the genius is affixed to the cross.”
—Franz Grillparzer (1791–1872)
“Every man has been brought up with the idea that decent women don’t pop in and out of bed; he has always been told by his mother that “nice girls don’t.” He finds, of course, when he gets older that this may be untrue—but only in a certain section of society.”
—Barbara Cartland (b. 1901)