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Original question:

LM117: Difference in LM117 versions

LM117: Difference between LM117H and /NOPB

Fredrik12
Prodigy 30 points
Part Number: LM117

Hello!

I'd like to know the difference between the parts LM117H and LM117H/NOPB. No matter where I look, I can't find any difference between these two.

I'd be grateful if someone with more intimate knowledge could shed some light.

  • 0
    TI__Genius 17125 points

    Hi Fredrik

    I am changing my reply since previous information was incorrect for the LM117H (but not for all metal cans).

    There is no difference between the LM117H and LM117H/NOPB.   They both have Au lead finish.

    The two product names came from how National Semiconductor handled the transition away from Pb (lead) in lead finishes (TI acquired National in 2011).  Up until the 2000s, Pb was used in lead finishes across the industry.  To indicate when a product no longer had Pb, National added the NOPB suffix to part numbers.  Products in the T0-39 package always had  Au lead finish and were automatically NOPB.   National added the product name LM117H/NOPB to help customers identify the part did not have Pb but also kept the old product name because customers had a history of ordering by it.

    The T0-39, which the LM117H uses, was one of the packages that had Au lead finish.  However, many of the other metal can packages, like the TO-3 used on the LM117K have SnPb solder dip lead finish.  In these cases, the NOPB means that another type of lead finish is used.

    The lead finish is shown in the "Quality, reliability & packaging information" link in the ordering table in the product page on ti.com.  I agree that this is not the easiest way to determine the differences between product names (especially in this case where there is no difference).

  • 0 in reply to Kirby Kruckmeyer96848
    Prodigy 30 points

    Thank you Kirby, that would seem like an obvious answer.

    However, this is not the case according to the datasheet or any product page on TI. LM117H doesn't have any lead finish, the pins are finished in gold and the component is ROHS qualified.

    The same goes for LM137H. No difference in any specification from LM137H/NOPB.

  • 0 in reply to Fredrik12
    TI__Genius 17125 points

    Hi Fredrik,

    You are correct in your assessment.  TI is working on correcting this and making it more apparent what the lead finishes are.

  • 0 in reply to Kirby Kruckmeyer96848
    Prodigy 30 points

    Thank you Kirby!

    Now I understand.