L9966 datasheet(113/122 Pages) STMICROELECTRONICS

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No intrusion allowed inwards the leads.

Dimension “b” does not include dambar protrusion. Allowable dambar protrusion shall not cause the lead

width to exceed the maximum “b” dimension by more than 0.08 mm. Dambar cannot be located on the lower

radius or the foot. Minimum space between protrusion and an adjacent lead is 0.07 mm for 0.4 mm and 0.5

mm pitch packages.

10. Exact shape of each corner is optional.

11. These dimensions apply to the flat section of the lead between 0.10 mm and 0.25 mm from the lead tip.

12. A1 is defined as the distance from the seating plane to the lowest point on the package body.

13. Dimensions D2 and E2 show the maximum exposed metal area on the package surface where the exposed

pad is located (if present). It includes all metal protrusions from exposed pad itself. End user should verify

D2 and E2 dimensions according to specific device application.

14. Dimensions D3 and E3 show the minimum solderable area, defined as the portion of exposed pad which is

guaranteed to be free from resin flashes/bleeds, bordered by internal edge of inner groove.

15. The optional exposed pad is generally coincident with the top or bottom side of the package and not allowed

to protrude beyond that surface.

16. “N” is the number of terminal positions for the specified body size.

17. For Tolerance of Form and Position see Table 83.

18. Critical dimensions:

18.1 Stand-Off

18.2 Overall Width

18.3 Lead Coplanarity

19. ST component cross reference: DM00516738.

20. For Symbols, Recommended Values and Tolerances see table below:

Table 84. Symbols, Recommended Values and Tolerances

SYMBOL

DEFINITION

NOTES

aaa

The tolerance that controls the position of the terminal pattern with

respect to Datum A and B. The center of the tolerance zone for each

terminal is defined by basic dimension e as related to Datum A and B.

For flange-molded packages, this

tolerance also applies for basic

dimensions D1 and E1. For packages

tooled with intentional terminal tip

protrusions, aaa does not apply to those

protrusions.

bbb

The bilateral profile tolerance that controls the position of the plastic

body sides. The centers of the profile zones are defined by the basic

dimensions D and E.

ccc

The unilateral tolerance located above the seating plane where in the

bottom surface of all terminals must be located.

This tolerance is commonly known as the

“coplanarity” of the package terminals.

ddd

The tolerance that controls the position of the terminals to each other.

The centers of the profile zones are defined by basic dimension e.

This tolerance is normally compounded

with tolerance zone defined by “b”.

L9966

TQFP48 (7x7x1 mm exp. pad down 5.0x5.0) package information

DS12459 - Rev 10

page 113/122

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