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LM140L: Trying to determine if there has a been a change to the process that has tightened the output voltage closer to the 11.8V?

Part Number: LM140L
Other Parts Discussed in Thread: TPS7A47

We usually receive parts varying from 11.7-11.9 and 11.9-12.1 and we are seeing greater number of parts arriving only in the 11.7-11.9 range and we are curious if the spec has been change to tightened their process controls resulting in a more stable output? 

We need parts in both ranges to meet separate program requirements. 

  • Hi Chris, 

    This product is on an old process node so there isn't any active developments happening on this process node that I am aware of. That being said, this product has used two different fab sites so it could be your are seeing this slight shift (which is still within spec) due to the fab site. We do not have a way to ensure that specific orders receive material from a specific site, since our planning system generally determines the fab based on fab loading/availability based on all product volume requirements.

    If you want to see if the fab location aligns with what you are seeing, you can check this by identifying the CSO (Chip Source Origin) on the material you received and see it it tends to correlate with the output voltages you were getting.  

    It's also possible that it is just normal variation and you happened to get batches that are very similar. 

  • Is there a chance that we could create two new custom parts that are screened for these ranges?

    11.7-11.9 and 11.9-12.1

  • Hi Chris, 

    We don't have any plans to invest in releasing new parts on this +25 year old part. It is on a legacy process node and legacy test platforms which making new development very difficult. 

    I assume you aren't open to considering a more modern device for your application, but if you are please let me know and I can try to find you the right product moving forward. 

  • If you had some replacement options available offered, ideally in the same package (three pin through hole metal can TO-39), we would be open to evaluating those options.

  • We don't have anything more modern in that metal can, but here is a link to a filtered version of our parametric search which shows the positive voltage linear regulators that we do have in a metal can. 

    If you wanted to assess newer options I'd start by suggesting TPS7A47 or TPS7B84-Q1. The TPS7A47 is capable of a higher output current than you need but the output voltage of the TPS7A47 can easily be set by shorting various pins to ground instead of using external feedback resistors, which might be useful for your use case where you want to trim the output voltage.