The DSC1100AL3-PROGT is a blank (user-programmable) oscillator from Microchip's DSC1100 series, meaning it ships without a pre-set output frequency — you program it to the exact frequency your design needs, rather than ordering a fixed-frequency part for every BOM line.
Package and board layout — 6-VDFN exposed pad
Housed in a 6-VDFN exposed pad package measuring 7.00 mm x 5.00 mm with a seated height of 0.90 mm, the DSC1100AL3-PROGT requires a thermal via pattern under the exposed pad for proper heat sinking — the pad is electrically connected to the die attach, so it also serves as a ground plane reference for the oscillator core. Surface-mount assembly with the exposed pad means the reflow profile must ensure adequate solder wetting under the pad — a stencil aperture covering 60-80% of the pad area is typical to avoid voiding.