Electronics > Mechanical & Automation Engineering

SOIC8 vs SO8 vs DSO8?

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Faringdon:
Hi,
These three docs say that SOIC8 , SO8 and DSO8 are all the same 6mm x 5mm size.

But there is another wider format...usually known as "SO8" ...but the SO8 here is not it...which is it?

SOIC8
https://www.centralsemi.com/pdfs/case/soic-8pd.pdf

SO8
https://www.diodes.com/assets/Package-Files/SO-8.pdf

DSO8
https://www.infineon.com/cms/en/product/packages/PG-DSO/PG-DSO-8-16/

mariush:
You ask the weirdest questions ... Is it that hard to look at the recommended footprints and compare them?

ex

soic has 0.72mm x 1.78mm pads , 6.46mm - 2 x 1.78mm = 2.9 mm between pad rows
 
so-8 has 0.80mm x 1.5mm pads     , 6.5mm - 2 x 1.5 = 3.5mm between pad rows

dso has 0.65mm  x 1.45mm pads ,  2 x 2.825 - 1.45 = 4.2mm between pad rows (edit: corrected, the pins are 0.41mm wide, pads are 0.65mm)

up to you how much it matters, there's benefits and downsides (thicker pins do more current, more heat dissipation), wider chips may allow routing more traces under the chip, or larger pad with through hole vias for higher heat transfer to other side of pcb...

Faringdon:
Thanks, all the three from the top post would essentially fit the same SOIC8 pad.....(SOIC8 being a 6.2mm by 5mm "courtyard" part).
There is a different version, that is significantly wider, that wouldnt fit it.
But i cannot find it
Can anyone find it?

..I once layed out for it with a "normal" soic8 pad, and it wouldnt fit...it was way  too wide.

Gyro:

--- Quote from: Faringdon on May 21, 2023, 06:29:55 pm ---Thanks, all the three from the top post would essentially fit the same SOIC8 pad.....(SOIC8 being a 6.2mm by 5mm "courtyard" part).
There is a different version, that is significantly wider, that wouldnt fit it.
But i cannot find it
Can anyone find it?

..I once layed out for it with a "normal" soic8 pad, and it wouldnt fit...it was way  too wide.

--- End quote ---

1. Look at the package mechanical dimensions in the back of the datasheet for the part you intend to use. Use the footprint that matches that part.
2. If there are multiple package variants, purchase the variant that matches your chosen footprint, it will have a different suffix. It is best to check the most commonly available variant to avoid delay or difficulty in sourcing.
3. Repeat for the other parts you intend to use, chosing the appropriate footprint for each.


P.S. If your footprint library does not contain an appropriate footprint, create one. Most companies create their own library of footprints, rather than relying on the ones that come with the CAD package.

Claude:
well... I never really considered that my first post on this forum would be to answer our, mhh, special guest :palm:, but here we go !!

https://en.wikipedia.org/wiki/Small_outline_integrated_circuit

you can see that there is a JEDEC and a EIAJ casing, the EIAJ is the special one (ATTINY13 for exemple can be delivered in both package).

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