Subject: | |
From: | |
Reply To: | (Designers Council Forum) |
Date: | Wed, 12 Jul 2006 13:26:33 +0100 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
As Haldor has said, most likely to reduce the aperture size for a large area.
I do this a lot on large pads for things like a D2PAK or other transistors with large tabs on.
Putting lots of 0805 pad apertures in a matrix in place of the single big one.
The component gets adequate solder to make the joint when it has all flowed.
Matthew.
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of ert
ert
Sent: Wednesday, July 12, 2006 5:24 AM
To: [log in to unmask]
Subject: [DC] OFN thermal pad pastemask
Hi All,
I recently captured on a board, the QFN package has thermal pad whose paste mask is not fully opened but has small square openings as shown below. What the reason to provide this type of pastemask?
_____________________
| ___ ____ |
| | | | | |
| | | | | |
| ------ ------ |
| |
| ___ ____ |
| | | | | |
| | | | | |
| ------ ------ |
| |
-------------------------------------
Thanks,
Nagaraj C.I.D
---------------------------------
Find out what India is talking about on Yahoo! Answers India.
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
So, what's NEW about the NEW Yahoo! Messenger? Find out.
---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------
|
|
|