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December 2005

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Subject:
From:
Donald Kyle <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Donald Kyle <[log in to unmask]>
Date:
Fri, 2 Dec 2005 09:16:10 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (106 lines)
Go to IPC  http://www.ipc.org/contentpage.asp?Pageid=4.6  and download the
IPC-7351 Land Pattern Viewer.
Once installed on your computer lookup QFN50P800X800-57V2N for land pattern
for a JEDEC MO-220-VLLD-2.

I have found that these parts are subject to solder joint cracking but it
depends a lot on your environment.

Cheers
Donald Kyle



At 08:06 AM 12/2/2005, you wrote:
>Best use the silicon datasheet in order to get the actual tab dimensions -
>MO-220 only gives min/max dimensions which are
>extremely wide in order to allow the actual tab to be matched to the die
>or allow flexibility.
>If AD do not give a recommended footprint (no doubt for liability) the
>best recourse would be assembly house preferences or
>IPC-7351.
>
>Allegro footprint attached. No liability accepted!
>
>Best Regards
>
>David Greig
>______________________________
>GigaDyne Ltd
>Buchan House
>Carnegie Campus
>Dunfermline KY11 8PL
>United Kingdom
>t: +44 (0)1383 624 975
>www.gigadyne.co.uk
>______________________________
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Brooks,Bill
>Sent: 01 December 2005 20:52
>To: [log in to unmask]
>Subject: [TN] 56 pin LFCSP footprint
>
>I have an Analog Devices part, 56-lead Lead Frame Chip Scale Package LFCSP
>with an 8X8mm body CP-56, supposed to be compliant
>with JEDEC MO-220-VLLD-2.
>
>Having a tough time locating a recommended footprint for this one...
>Any help?
>
>Also any issues with mounting? Since this is a direct to board soldered
>device, it may be subject to CTE mismatches and the
>like... anyone have experience with any soldering or reliability issues
>with assembling this part to a fiberglass/epoxy board?
>
>Here's a link to the part description
>http://www.analog.com/UploadedFiles/Packages/352655155839944545242119821CP_5
>6.pdf
><http://www.analog.com/UploadedFiles/Packages/352655155839944545242119821CP_
>56.pdf>
>
>Best regards,
>
>
>Bill Brooks
>
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