Tom,
One lead of PowerDi123 is used as a heatsink and that lead should meet 8.3.14.
Regards,
Veronika Anderson C.I.D | Sr. Electrical/Mechanical Design Engineer | Excelitas Technologies
Office: +1 626.967.9521 x 236
1330 East Cypress Street, Covina, CA 91724 USA
[log in to unmask]
www.excelitas.com
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Tom Hausherr
Sent: Tuesday, August 26, 2014 10:33 AM
To: [log in to unmask]
Subject: Re: [DC] Type of Footprint
James,
Sorry for the delay but I was on a webcast for the past couple hours.
Here is your answer with a little help from my friends at IPC:
Hi All,
I did a little research on the part and was able to find the physical description of the component.
Keep in mind that the main focus of the IPC-A-610 is the physical/visual characteristics of the component. The function of the component doesn't usually change the criteria to which you assess the component mounting. The component could carry out any number of functions while having the same physical lead configuration.
The PowerDI 123 looks like it would probably fall under the flat-lug lead criteria, section 8.3.9 of the IPC-A-610E (see attached). While the component isn't using the leads as an heat dissipation, the physical characteristics of the leads do not meet any other criteria in section 8.
The bottom only terminations would be, as the name implies, a component with only a termination on the bottom of the component having no designed extension beyond the component body.
It is always the prerogative of the designer to address the specific criteria to which the component will be evaluated. The final determination should involve the designer, manufacturer, and customer so that the final assembly is completed to the satisfaction of the customer.
I hope this helps clear up the questions.
Kris Roberson, Manager
Assembly Technology
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of James Jackson
Sent: Tuesday, August 26, 2014 7:47 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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