ST2149B

Package mechanical data

Doc ID 023310 Rev 1

19/23

Table 12.

Mechanical data for QFN12 (1.7 x 2.0 mm) - 0.40 mm pitch

Symbol

Dimensions

mm.

Min.

Nom.

Max.

A

0.45

0.50

0.55

A1

0.00

0.02

0.05

b

0.15

0.20

0.25

D

1.70 BSC

E

2.00 BSC

e

0.40 BSC

L

0.35

0.45

0.55

aaa

0.05

bbb

0.07

ccc

0.10

ddd

0.05

eee

0.08

N

12

ND

1

NE

5

Notes

1.

Dimensioning and tolerance conform to ASME Y14.5M-1994.

2.

All dimensions are in millimeters.

3.

N is the total number of terminals.

4.

The location of the terminal #1 identifier and terminal numbering convention conforms to JEDEC

publication 95 SPP-002.

5.

ND and NE refer to the number of terminals on the D and E side respectively.

6.

Dimension b applies to the metallized terminal. If the terminal has the optional radius on the other end of

the terminal, dimension b should not be measured in that radius area.

7.

Coplanarity applies to the terminals and all other bottom surface metallization.

8.

NJ in the variation code refers to a package which is not currently JEDEC registered.

LF part No.

-

LF DWG. No.

B-2888