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LMH6554: Footprint paste layer does not match datasheet

Part Number: LMH6554

Hi

We have been having some soldering problems with the LMH6554 on our boards - we have noticed that the paste layer provided by TI online (via ultralibrarian https://vendor.ultralibrarian.com/TI/embedded/?gpn=LMH6554&package=NHJ&pin=14&sid=litd9f1f400d9f1f400d9f1f4006091e27d88ef0cb&c=1) does not seem to match the datasheet. In particular, the solder paste layer is offset from the pads, and larger than the recommended 0.6x0.2mm land pattern. Is this intentional, or is this an error in the provided footprint?

Thanks

Jordan

  • Hello Jordan,

      Thank you for bringing this to our attention. Which CAD format did you chose from the ultralibrarian? The previews seem to match up the datasheet in terms of pitch, max height, max length, and max width. However, the preview does not specify the land pattern of 0.2mm, but I can check the model you used for your boards.

    Thanks,
    Sima 

  • Hi, we are using the Altium Designer format. I have just redownloaded to verify (the copy we had downloaded was from more than a year ago). The pad dimensions are now correct (0.2x0.6mm) for the solder paste, however it is still offset from the actual PCB pad per the image attached. I am trying to understanding if this is intentional, as it seems unusual to me.

  • Hello Jordan,

      That is strange; that shouldn't be intentional. 

      I downloaded the Altium symbol from ultralibrarian and compared it to our internal Altium symbol:

            

       I will let our web/symbol team know about this issue, and will update you when this has been corrected.

    Thanks!
    Sima