TDFN - Thin Dual Flat No Leads

             

The Thin Dual Flat No Leads package, or TDFN, is a very small and thin square-shaped or rectangular surface-mount plastic package with no leads.  Instead of leads, it uses metal pads along two sides of the package body for electrical connection to the outside world.  It is basically a thinner version of the dual flat no leads (DFN) package.

  

Typical TDFN pad counts range from 6 to 28. The maximum body thickness of TDFN packages is 0.8 mm. The long side of typical TDFN package bodies range from 2 mm to 8 mm.  The pad pitch (distance between pads) used by TDFN packages is usually either 0.4 mm or 0.5 mm, although other pad pitch values are also used. 

   

Table 1. Properties of Some Examples of TDFN's

Part Number

No. of Pads

Body Size

Body Thickness

Pad Pitch

TDFN-6

6

3 mm x 3 mm

0.75 mm

0.95 mm

TDFN-8

8

3 mm x 3 mm

0.75 mm

0.65 mm

TDFN-8

8

2 mm x 2 mm

0.75 mm

0.5 mm

TDFN-10

10

2 mm x 3 mm

0.75 mm

0.5 mm

TDFN-10

10

3 mm x 4 mm

0.75 mm

0.5 mm

TDFN-14

14

3 mm x 5 mm

0.75 mm

0.4 mm

TDFN-28

28

4 mm x 8 mm

0.75 mm

0.5 mm

   

Figure 1.  Example of a TDFN package

      

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