[PCB specification] IPC Low Density

Altium Designer's PCB footprints are often seen in the same package, such as the IPC low density (lower density), IPC medium density (medium density), IPC high density (dense), such as TSSOP16, Why do you say that? IPC is the abbreviation for the American "Printed Circuit Board Association" ("the Institute of printed circuit").

The "Printed Circuit Board Association" was renamed several times, but the IPC abbreviation has remained unchanged. IPC has developed a number of standards and specifications, including, of course, PCB standards and specifications, the IPC Packaging library is one of them.

Take TSSOP16 For example, low density, medium density, high density only the length of the pin is different, occupy the area of the pad is naturally different. Obviously, the low-density pins are the longest, and the high-density pins are the shortest.

If the circuit board area is large, directly with the IPC low density good. If the area is compact, it is necessary to import three kinds of schematic diagram, the amount of a quantity to see which is appropriate.
The name would be: tssop16_l IPC high Density  (hi-Density)
Tssop16_m IPC Low density   (lower density)
Tssop16_n IPC medium density (medium density)

[PCB specification] IPC Low Density