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ULC1001: Footprint design issue

fedi makni
Prodigy 100 points
Part Number: ULC1001

Hello,

I am willing to create a footprint of ULC1001 based on the details provided in the datasheet

https://www.ti.com/lit/ds/symlink/ulc1001.pdf?ts=1702020934670&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FULC1001

I am facing a hard time understanding the guidelines provided in the datasheet Page 7 and 8.

Depending on what i understand the origin (0,0) is the centre of the part but i couldn't understand the meaning of 2X 1.663 for pin 1 for example (same for all other pins)

or for example for pin 20 there's 28X and two options 0.35 and 0.15 why two values exist, is it the tolerances ? why not the the usual representation by +- specific value which is widely used? and what's 28?

even for the overall size there are 2 values 5.1 and 4.9 why not 5 and +- 0.1?

Could you please provide some details about this datasheet? i didn't face problems with previous part of TI but this one kinda new.

Thanks

  • 0
    TI__Genius 17780 points

    Hello,

    Thank you for reaching out. I will check with our packaging team and get back to you with an update by mid next week at the latest. 

    Regards,
    Sydney Northcutt 

  • 0 in reply to Sydney Northcutt
    TI__Genius 17780 points

    Hello,

    Thank you for your patience. The 2x or any number followed by an x is referring to how many pins have that measurement. For the pins on the left side and top side with 2x, the measurement is referring to how far the pin is from the center. There is a 2x because the pin directly across from it has the same distance from the center. For example:

    For the measurement with 28x, it is measuring the width of the pin and stating that 28 pins have that width. For measurements with two values you are correct, this is the measurement with tolerances. Some devices has this notation and some have the +- notation. 

    Regards,
    Sydney Northcutt