 
| Subject: | |
| From: | |
| Reply To: | TechNet E-Mail Forum. |
| Date: | Thu, 24 Dec 1998 09:54:31 -0600 |
| Content-Type: | text/plain |
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Tom,
If possible, rotate the part 90 degrees CCW. Otherwise you could
look at adding a robber pad behind the device where the bridging is
occuring.
Mike McMonagle
PCA Process Engineering Supervisor
K*Tec Electronics
1111 Gillingham Lane
Sugar Land, TX 77478
(281) 243-5639 Phone
(281) 243-5539 Fax
[log in to unmask]
> -----Original Message-----
> From: Tom Braswell [SMTP:[log in to unmask]]
> Sent: Thursday, December 24, 1998 9:32 AM
> To: [log in to unmask]
> Subject: [TN] Pad to pad spacing on TO-92
>
> Technetters,
>
> I have a PCB design that uses about 35 TO-92 transistors, along with
> other components. These transistors are my problem. We wave solder
> these PCB
> and find alot of short bridges across the legs. The lead protrusion
> is 1mm, design is staggered, see diagram, and pad spacing is about
> .498 mm. I would like to know the IPC spec on the pad to pad spacing
> (annular ring to annular ring ), and some suggestions of what others
> use in their designs. I am not the designer, but PCB is up for
> redesign and would like to offer some feedback to him on DFM (design
> for manufacturability)
>
>
> Direction of PCB to wave -------------------------------->
>
> O O
> O
>
>
> Thanks! Merry Christmas & Happy Holidays
>
> Tom Braswell
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