SPC574S60 datasheet(70/77 Pages) STMICROELECTRONICS

70 / 77 page

Package information

SPC574Sx

70/77

DS10601 Rev 6

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

4. 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.

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

6. To be determined at seating datum plane C.

7. The Top package body size may be smaller than the bottom package size by as much as 0.15 mm.

8. Dimensions D1 and E1 do not include mold flash or protrusions. Allowable mold flash or protrusions is “0.25 mm” per side.

D1 and E1 are maximum plastic body size dimensions including mold mismatch.

9. 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.

10. 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.

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

12. Dimensioning and tolerancing schemes conform to ASME Y14.5M-1994.

13. All Dimensions are in millimeters.

14. For Symbols, Recommended Values and Tolerances see Table below:

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 know 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”.

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