Lead Frame Chip Scale Package (LFCSP) integrated circuits are devices with dimensions that are apparently determined by the required number of connections. Some of them are only a few square millimeters in size. For the connections to the outside world, there are small contact pads on the bottom along the four sides, each measuring 0.6 x 0.25 mm with a spacing of 0.4 mm. A small ground plane is located in the middle. Soldering these ICs to a PCB by hand can be very difficult.
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