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LM78M: Device Feature Size for LM78M05CDT/NOPB

languer
Prodigy 100 points
Part Number: LM78M
Other Parts Discussed in Thread: LM341, UA78

Hi,

For the purpose of radiation analysis we need some more information on the LM78M05CDT/NOPB. The part design itself appears to have a pretty extensive history (dating back to the LM341 in the 1990s) but the datasheet was recently revised which brought up questions by our radiation team. As part of our requirements to analyze every part for radiation effects we need to understand the parts feature size and whether the recent datasheet changes were due to new packaging, terminations, or specification updated; or the updates were due to changes on the device manufacturing with a smaller feature size.

The questions are therefore related to (1) feature size of the device?, (2) similarity of the design/manufacture of this part to its older family members?, (3) what was the driver for the most recent datasheet changes?

  • 0
    TI__Mastermind 43570 points

    Hi Languer,

    There have been no changes to the device at all. The recent datasheet update was strictly cosmetic to bring up to current TI standards, Highlight the different options and differences, and show that the UA78 could a lower-cost alternative. 

    I hope this answers your question.

  • 0 in reply to JCHK
    Prodigy 100 points

    JCHK, thank you so much for the prompt response. I do have a follow-up question I hope you can answer. Would you be able to tell if the device has gone through any design/production changes that would have reduced its feature size (such as migrating wafers to smaller ones). Since the device seems to be in existence since the early 2000s, and other products we have are using it, we could more easily claim we have field data to support any known issues of latch-up or similar due to radiation effects if there have not been any changes (of course the more recent the changes, the harder it would be to make that claim). 

  • 0 in reply to languer
    TI__Mastermind 43570 points

    HI Languer,

    We have not migrated this wafer to a new process node. This is on the same bipolar process. If in the future we do move this to a new process node, we would issue a Product Change Notification (PCN) for you to review.

    I hope this answers your question. 

  • 0 in reply to JCHK
    Prodigy 100 points

    I believe it does - thanks.