IPC-SM-782A 表面安装设计和焊盘设计标准(带BGA).pdf - 第224页
• Zone 8 Zone 8 is the tolerance calculation for toe, heel and side tolerance, and is kept to the side of the spreadsheet because this is where the calculations are accomplished. See Figure A-5. • Zone 9 Zone 9 is where …
• Zone 6
Zone 6 is the most important part of the analysis. It is in
this area where the user has the opportunity to fine tune
the land pattern through the adjustment factor to enhance
the pattern for both solder joint formation and character-
istics that can be used by the CAD systems. See Figure
A-3.
• Zone 7
Zone 7 provides information as to what has been accom-
plished for the toe, heel, and side fillets. This zone is
divided into three segments. See Figure A-4.
Figure A-3 Zone 6
Figure A-4 Zone 7
December 1999 IPC-SM-782A
A-3
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
• Zone 8
Zone 8 is the tolerance calculation for toe, heel and side
tolerance, and is kept to the side of the spreadsheet
because this is where the calculations are accomplished.
See Figure A-5.
• Zone 9
Zone 9 is where all the component dimension calculations
are derived. These are mostly calculated information,
although columns BR and BS provide calculated informa-
tion that is transferred to another zone. See Figure A-5.
• Zone 10
Zone 10 again provides information on the component
identification. See Figure A-6.
Figure A-5 Zones 8 and 9
Figure A-6 Zone 10
IPC-SM-782A December 1999
A-4
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ
Standard Improvement Form
IPC-SM-782A
The purpose of this form is to provide the
Technical Committee of IPC with input
from the industry regarding usage of
the subject standard.
Individuals or companies are invited to
submit comments to IPC. All comments
will be collected and dispersed to the
appropriate committee(s).
If you can provide input, please complete
this form and return to:
IPC
2215 Sanders Road
Northbrook, IL 60062-6135
Fax 847 509.9798
1. I recommend changes to the following:
Requirement, paragraph number
Test Method number , paragraph number
The referenced paragraph number has proven to be:
Unclear Too Rigid In Error
Other
2. Recommendations for correction:
3. Other suggestions for document improvement:
Submitted by:
Name Telephone
Company E-mail
Address
City/State/Zip Date
ASSOCIATION CONNECTING
ELECTRONICS INDUSTRIES
电子技术应用 ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ