Differences between MFF2 and DFN8, VQFN8

Different names, same physical chip in package.
MFF2 is the Telecom application name of the DFN8/VQFN8 package.
DFN8/VQFN8 is the Industrial application name for packages having 8 contacts on 2 opposite sides (Dual).
DFN8 vs VQFN: VQFN is the IFX naming with very thin package.

• MFF2 is specified by ETSI TS102671
• DFN/VQFN is specified by JEDEC standard
  

WARNING: MFF2 vs DFN/VQFN have different contact numbering conventions:

Pin Number	Contact Number(TS 102 671)	Contact Name(as per TS102671)
Pin 8	C1	Vcc
Pin 7	C2	RST
Pin 6	C3	CLK
Pin 5	C4	Not Connected
Pin 1	C5	Vss - GND
Pin 2	C6	SWIO
Pin 3	C7	I/O
Pin 4	C8	Not Connected

MFF2 pinout indexing specified in ETSI TS102671 (see upper table, middle row) is not complying to the JEDEC standard.
This is creates confusion.
Consequently the correct pinout is:

Pin Number	Contact Name
Pin 1	GND
Pin 2	SWIO
Pin 3	IO0
Pin 4	Not
Pin 5	Not
Pin 6	CLK
Pin 7	RST
Pin 8	Vcc