I'm a bit confused by the fact that manufacturers use their own package designations, which don't always match those defined by IPC standards or the PCB Libraries naming convention.

In particular, the TCAL9538DTUR is identified as:

• DigiKey: 16-XFQFN
• TI datasheet: X2QFN (DTU0016A)

However, to me, it looks more like a conventional LGA footprint, so I'm tempted to classify it as an LGA. The problem is that when searching the library, someone looking for this component based on the designation used by DigiKey or in the Texas Instruments datasheet would most likely search for QFN.

Perhaps it would be better to use a non-standard name that explicitly incorporates the package designation given by the manufacturer in the datasheet, such as X2QFN, rather than trying to force it into a standard package category. Alternatively, we could name it LGA16CP40_4X4_160X160X40L17.