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August 2014

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Subject:
Re: Type of Footprint
From:
Theodore J Tontis <[log in to unmask]>
Reply To:
(Designers Council Forum)
Date:
Tue, 26 Aug 2014 15:24:36 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (1 lines) 
James,

In my opinion, you can define it as one or the other, chip or flat lug. 

Get with the customer and agree on the package type that will be used for assembly validation, note it in the production file.

When dealing with new package styles or hybrid package styles it is best to get with the customer and agree on what package style will be used to evaluate assembly. If you are the customer then get with the assembly house and get some type of agreement in place so there is a clear understanding of what each other's expectations are.

That’s why there is that disclaimer in A-610 that’s the catch all " the acceptance criteria needs to be defined between the customer and supplier."

Ted T.

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of James Jackson
Sent: Tuesday, August 26, 2014 9:47 AM
To: [log in to unmask]
Subject: Re: [DC] Type of Footprint

Tom,

My original question referred to IPC-A-610.

Can you give the answer using this Document?

I feel like I asked a question and it was answered using a different spec. If I take this answer to the Assembly folks, they will not accept it (and neither will I).

Please answer using IPC-A-610 as the reference document.

Thanks!

Regards,

James


On 2014-08-26 09:14, Tom Hausherr wrote:
> James,
> 
> IPC-7351B - Section 8.13 & Table 3-22 Small Outline Components, Flat 
> Lead
> 
> Tom
> 
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of 
> James Jackson
> Sent: Tuesday, August 26, 2014 5:48 AM
> To: [log in to unmask]
> Subject: Re: [DC] Type of Footprint
> 
> Tom,
> 
> Thank you for your response. Can you now answer the question asked in 
> the OP?
> 
> Regards,
> 
> James Jackson
> 
> 
> 
> On 2014-08-25 22:11, Tom Hausherr wrote:
>> James,
>> 
>> In the free PCB Libraries "Library Expert Lite" (IPC-7351 Calculator) 
>> it's in the Small Outline Diode Flat Lead (SODFL) component family 
>> with Pin 1 a different size than Pin 2.
>> 
>> The Diodes, Inc. PowerDI 123 terminal is considered a "Flat Lead".
>> 
>> Or you can use the mfr. pad layout:
>> http://www.diodes.com/datasheets/ap02001.pdf
>> 
>> Both IPC land pattern calculation or the mfr. footprint 
>> recommendations can be entered into the free "Library Expert Lite"
>> and
>> output to 21 CAD tools.
>> 
>> Or purchase the IPC-7351B standard and get a CD-ROM of an enhanced 
>> version of the Library Expert Lite. Free auto-updates.
>> 
>> Tom
>> 
>> Tom Hausherr CID+, CIT
>> President
>> PCB Libraries, Inc.
>> 13730 Sorbonne Court
>> San Diego, CA 92128
>> 858.592.4828 Office
>> 858.859.5371 Cell
>> www.pcblibraries.com
>> 
>> -----Original Message-----
>> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of 
>> James Jackson
>> Sent: Monday, August 25, 2014 7:29 PM
>> To: [log in to unmask]
>> Subject: [DC] Type of Footprint
>> 
>> Diodes, Inc. has a pattern called PowerDI 123.
>> 
>> These diodes are used on a board that is inspected to IPC-A-610 
>> (latest rev).
>> 
>> My question is this...
>> 
>> Per Section 8 of the standard, what are the PowerDI 123 parts 
>> classified as?
>> 
>> I believe they fall into...
>> 
>>   8.2.1 Chip Components - Bottom Only Terminations
>> 
>> Someone else says that they are...
>> 
>> 8.2.9 - Flat Lug Leads
>> 
>> I am thinking that the Flat Lug Leads are the RF transistor category 
>> parts.
>> 
>> Anyway, we both may be wrong. Is there anyone who has knowledge that 
>> can guide me in the right direction and help identify the type of 
>> part that the PowerDI 123 is?
>> 
>> Thanks in advance.
>> 
>> Regards,
>> 
>> James Jackson
>> 
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