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soic-20 chip size — Parallax Forums

soic-20 chip size

jdoleckijdolecki Posts: 726
edited 2023-01-16 04:07 in General Discussion

Are all chips labeled soic-20 the same size foot print on a circuit board?

I have an old chip I cant find a drawing for.


  • VonSzarvasVonSzarvas Posts: 3,275
    edited 2023-01-16 08:29

    Almost Yes. Check the IC width matches. Whilst the length and leg-pitch will follow a standard for SOIC-20, some ICs can have 2 or 3 width options.

    And for assembly the plastic body can vary in length, so keep enough space on your PCB based on your actual part, and not the dims from a generic footprint.

  • Having opened the datasheet I can see there's no packaging info.
    In those cases, the manufacturer will most-always have that info at their website.

  • evanhevanh Posts: 15,168

    Man, they don't make it easy. Best I found from Von's link was Extracting page 35 gives the attached.

  • thanks everyone

  • jmgjmg Posts: 15,144

    Are all chips labeled soic-20 the same size foot print on a circuit board?

    Usually :)

    The most common, by far, is the 0.3" wide package, often called SO20W, or SOP20L

    This from a CAD package list

    geda_SO20W:SO20W:SO20W:Small outline package, wide (300mil)

    but there are also less common
    geda_SO20M:SO20M:SO20M:Small outline package, medium (200mil)
    geda_SO20N:SO20N:SO20N:Small outline package, narrow (150mil)

    I've seen some MCU's offered in the SO20N, (which becomes a simply longer SO16N), but the TSSOP20 seems to be the
    most common 20 pin gull wing package in 2022/2023

    Digikey also gives info on that FCT807 part :

    74FCT807BTSOGI ... Surface Mount. Package / Case. 20-SOIC (0.295", 7.50mm Width). Supplier Device Package. 20-SOIC

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