Packaging Dimensions Standard

[andre.lubbock]

Hi

I'm looking for a standard covering packaging dimensions for Dual Inline Plastic Surface Mount Package. I expect JEDEC would have something but so I've come up empty handed.

One of these https://au.mouser.com/ProductDetail/onsemi-Fairchild/FOD817ASD?qs=7cQpS2oZOEPJG7mvClvS4w%3D%3D&mgh=1&vip=1&gad_source=1&gclid=Cj0KCQiAwvKtBhDrARIsAJj-kTikWf4uJMCktL6FU4QSW9FTPSpucfK13A-6by0j03XEVNfHyLT8fl0aAkTqEALw_wcB

Can anyone help please. Thanks

[Ian.M]

I don't think you'll find one.  Datasheet page 11 (PDIP4 GW package drawing)

NOTES:
A) NO STANDARD APPLIES TO THIS PACKAGE.

[andre.lubbock]

Good call Ian and an unfortunate mistake by me as I seem to have linked the wrong datasheet - my apologies. 

Below I've linked to 2 manufacturers. Their drawings are so similar that presumably there's an underlying standard ?

SM part in this datasheet
https://www.mouser.com/datasheet/2/149/H11A817B-87085.pdf

SL-4 in this datasheet
https://www.diodes.com/assets/Datasheets/DPC817-Series.pdf

Specifically, I'm interested in the minimum creepage distance shown in red



Thanks again

[Ian.M]

Its body probably uses the same moulds as the through-hole DIP package, so odds are if you can find the dimension limits for a JEDEC standard DIP package, these gull-wing DIPs will be the same.   However you will need some fudge factor for flashes on the mould line and for it not perfectly centering on its pads during reflow.

[andre.lubbock]

You're right the mfr datasheet shows SM and TH share the same body.

I have found the JEDEC standard for the TH part but unfortunately it differs from the mfr drawing and also does not specify some key dimensions.

I've attached the JEDEC standard for the benefit of others.

Thanks for your input

[tooki]

Those probably aren’t “key” dimensions, then.

Regardless, I’m not sure you’re going to get the answer you want (an underlying standard), given that the one manufacturer expressly says it’s not based on one!

They’re clearly derived from standard PDIP, but that doesn’t mean there’s necessarily a standard for them.

Just design around the worst-case scenario based on the manufacturer drawing. Pretend there’s a ridiculously oversized draft angle on the case (like 45 degrees) and use the minimum dimensions. If your design is so tightly calculated that the dimensional tolerances would make or break the creepage requirements, it’s a bad design to begin with.