> This is NOT a firm answer, but just a guess.
>
> Perhaps your TSOP 10x20 - 40 pin is a TSOP Type II.
>
> The TSOPs in IPC-SM-782 are TSOP Type I. JEDEC has added a new TSOP outline called
> TSOP Type II.
>
> The IPC -SM-782 committee is looking at the outlines to develop new land patterns for
> the Type II, but is currently focusing their efforts on publishing land patterns for
> BGAs. When that is completed, we will finish the Type II land patterns.
>
>
> Lisa Williams
> IPC
> 2215 Sanders Road
> Northbrook, IL  60062
> URL:  www.ipc.org


Thanks, this clarifies what is going on. I used the row spacing for
the 10x20 with .5mm pin spacing, and used the pad width of the 40 pin
package. A kind of compromise package as it were. I get on the WEB
and try out the calculator.


*************************************************
Thanks
Walter L. Williams, Circuit Board Designer
I-O Corporation, SLC, Utah
Industry leader in IBM AS400 connectivity products
[log in to unmask]
Voice: 1-801-972-3558 ex 123
Alternate: 1-801-973-6767
*************************************************
Carpe Diem

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