SPC582BX datasheet(99/115 Pages) STMICROELECTRONICS

99 / 115 page

DS11597 Rev 4

99/115

SPC582Bx

Package information

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

The Top package body size may be smaller than the bottom package size by much as

0.15 mm.

Datum A-B and D to be determined at datum plane H.

To be determined at setting datum plane C.

Detail of pin 1 identifier are optional but must be located within the zone indicated.

All Dimensions are in millimeters.

No intrusion allowed inwards the leads.

Exact shape of each corner is optional.

These dimensions apply to the flat section of the lead between 0.10 mm and 0.25 mm

from the lead tip.

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

body.

11. The optional exposed pad is generally coincident with the top or bottom side of the

package and not allowed to protrude beyond that surface.

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

13. For Tolerance of Form and Position see Table.

14. Critical dimensions:

D & E

b & L

D2 & E2

15. For Symbols, recommended values and tolerances see table below: (ACCORDING TO

PACKAGE OR JEDEC SPEC IF REGISTERED)

Table 53. QFN48 symbol definitions

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”.

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