Subject: | |
From: | |
Date: | Fri, 07 Feb 1997 11:08:04 -0500 |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
Wesley,
Mil-Std. 2000 (A) only specifies the minimum .008" solder
connection height if the component has bottom only terminations. Most LCC's
have bottom and side castelation/termination which eliminates the
requirement for the .008 spacing. See 4.23.5 of Mil-STD 2000A for
clarification. I see no reference to specific spacing requirements in the
actual Mil-Std 2000 (16, January 1989).
Mark Spitnale
Hughes Defense
(219) 429-5992
At 07:06 AM 2/7/97 -0500, you wrote:
>>Return-Path: <[log in to unmask]>
>>Resent-Date: Wed, 5 Feb 1997 15:41:45 -0800
>>Resent-Sender: [log in to unmask]
>>Old-Return-Path: <SAMPLES@[138.32.59.15]>
>>Comments: Authenticated sender is <SAMPLES@[138.32.59.15]>
>>From: [log in to unmask]
>>To: [log in to unmask]
>>Date: Wed, 5 Feb 1997 10:20:51 +0000
>>Subject: Assy:LCC height control
>>Priority: normal
>>Resent-Message-Id: <"-c4eJ2.0.zo7.FUD-o"@ipc>
>>Resent-From: [log in to unmask]
>>X-Mailing-List: <[log in to unmask]> archive/latest/9978
>>X-Loop: [log in to unmask]
>>Resent-Sender: [log in to unmask]
>>
>>Hello
>>
>>Does anyone have experience trying to control the height of an LCC
>>(leadless) off the board. I have drawing requirements of .008".
>>The components are ceramic and are on both sides of the board.
>>The board is mixed technology and extremely dense. It also has a
>>.062" heatsink (plate) on the top side. Top side printing is out of
>>the question.
>>
>>The volumes are low (about 80)
>>LCC component count is about 30 per board
>>The design is fixed (no chance in He** of changing
>>Spec 's are Military ie..2000
>>
>>I have tried to locate water/solvent soluable waffers with no luck (.008")
>>Hand soldering with a spacer is not my preffered option either
>>
>>Any recomendations would be appriciated
>>
>>Thanks in advance
>>
>>Wesley Samples
>>[log in to unmask]
>>(817) 234-6842
>>
>>***************************************************************************
>>* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
>>***************************************************************************
>>* To unsubscribe from this list at any time, send a message to: *
>>* [log in to unmask] with <subject: unsubscribe> and no text. *
>>***************************************************************************
>>* If you are having a problem with the IPC TechNet forum please contact *
>>* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
>>***************************************************************************
>>
>>
>>
>----------------------------------
>Jeffery L. Hempton Phone: (219) 429-7335 Fax: (219) 429-4688
>Boardshop Manufacturing Engineer Mail Stop: 25-31
>Hughes Defense Communications
>1010 Production Road, Fort Wayne, IN 46808-4106
>Email: [log in to unmask]
>
>"Those who dream by day are cognizant of many things which escape those who
>dream only by night" - -Edgar Allen Poe
>
>
>
----------------------------------
Mark W. Spitnale Phone: (219) 429-5992 Fax: (219) 429-
Hughes Defense Communications Mail Stop: 25-31
1010 Production Road, Fort Wayne, IN 46808-4106
Email: [log in to unmask]
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|