LM3S811 Datasheet, PDF (404/410 Pages) List of Unclassifed Manufacturers – Microcontroller

Package Information
21 Package Information
Figure 21-1. 48-Pin LQFP Package
aaa
bbb
ccc
ddd
LEAD COUNT; FOOT PRINT
48, 2.0 FP
MIN
NOM
MAX
A ===
===
1.60
A1 0.05
===
0.15
A2 1.35
1.40
1.45
D
8.00 BSC
D1
7.00 BSC
E
9.00 BSC
E1
7.00 BSC
L 0.45
0.80
0.75
0.50 BSC
b 0.17
0.22
0.27
b1 0.17
0.20
0.23
c 0.09
===
0.20
c1 0.09
===
0.16
Tolerances of form and position
aaa
0.20
bbb
0.20
ccc
0.08
ddd
0.08
404
NOTES:
1. All dimensions are in mm. All dimensioning and tolerancing
conform to ANSI Y14.5M-1982.
2. The top package body size may be smaller than the bottom
package body size by as much as 0.20.
3. Datums A-B and -D- to be determined at datum plane -H- .
4. To be determined at seating plane -C- .
5. Dimensions D1 and E1 do not include mold protrusion.
Allowable protrusion is 0.25 per side. D1 and E1 are
maximum plastic body size dimensions including mold
mismatch.
6. Surface finish of the package is #24-27 Charmille
(1.6-2.3μmR₀) Pin 1 and ejector pin may be less than
0.1μmR₀.
7. Dambar removal protrusion does not exceed 0.08. Intrusion
does not exceed 0.03.
8. Burr does not exceed 0.08 in any direction.
9. 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.
Dambar cannot be located on the lower radius or the foot.
Minimum space between protrusion and adjacent lead is
0.07 for 0.40 and 0.50 pitch package.
10. Corner radius of plastic body does not exceed 0.20.
11. These dimensions apply to the flat section of the lead
between 0.10 and 0.25 from the lead tip.
12. A1 is defined as the distance from the seating plane to the
lowest point of the package body.
13. Finish of leads is tin plated.
14. All specifications and dimensions are subjected to IPAC’S
manufacturing process flow and materials.
15. The packages described in the drawing conform to JEDEC
M5-026A. Where discrepancies between the JEDEC and
IPAC documents exist, this drawing will take the
precedence.
Preliminary
October 8, 2006