Sometimes datasheets don’t always cover all the variations of suffixes attached to part numbers. In this case, the “J” is not explained explicitly for EEU-EB1E331BJ; Digi-Key part number P19604CT-ND. I asked our product manager for Panasonic and they said it stands for the 3.5mm spacing between the leads.
If you ever see a piece of a part number not explicitly explained in the datasheet feel free to ask on the forum or contact us at Applications.Engineering@digikey.com.
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