The
Dual Flat No Leads
package, or DFN,
is
a very small square-shaped or rectangular surface-mount plastic package
with no leads.
Metal pads or lands along two sides of the bottom of the DFN package serve as electrical connection points to
the outside world. The DFN is similar to the QFN,
except that the latter has lands all around the periphery of the package
instead of just two sides like the DFN.
Because the DFN has no leads and has shorter bond wire lengths, it
provides a
higher electrical performance than leaded packages due to less
inductance.
DFN packages usually have pad counts
that range from 3 to 32. The typical DFN body size has a length
that ranges from 2 mm to 7 mm. DFN pad pitch (distance between
pads) typically ranges from 0.5 mm or 0.95 mm. A thinner version
of the DFN exists and is known as the TDFN.
Table 1. Properties of
Some Examples of DFN's
|
Part Number |
No. of Pins |
Body
Size |
Body Thickness |
Pad Pitch |
|
DFN-6 |
6 |
3 mm x 3
mm |
0.9 mm |
0.95 mm |
|
DFN-8 |
8 |
2 mm x 3
mm |
0.9 mm |
0.50 mm |
|
DFN-10 |
10 |
4 mm x 4
mm |
0.9 mm |
0.65 mm |
|
DFN-16 |
16 |
1.6 mm x
4
mm |
0.80 mm |
0.50 mm |
