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LM317M: legacy chip and new chip

R.Fukunaga
Expert 2665 points
Part Number: LM317M


Tool/software:

Hi all,

1) When designing circuits, is it necessary to design assuming the use of legacy chips?

The data sheet 8.1.2 Device Nomenclature describes as follows.
>>Devices either ship with the legacy chip (CSO: SFB) or the new chip (CSO: RFB). The reel packaging label provides CSO information to distinguish which chip is used.

1) It is random whether the legacy chip or the new chip is installed in the LM317M.
2) It is not possible to determine which chip is installed based on the model number.
3) To determine, we need to check the CSO information described on the package at the time of delivery.

Is that correct?

It seems to say that whether legacy chip or new chip is installed in DS is random.

Is there an explanatory document showing the difference between legacy chips and new chips?

Best Regards,

Ryusuke

  • 0
    TI__Genius 13990 points

    Hi Ryusuke,

    R.Fukunaga said:
    1) When designing circuits, is it necessary to design assuming the use of legacy chips?

    You should take into account that either the legacy or new chip may be shipped to you. Unless the customer raised an objection within the allowed timeframe of TI issuing a PCN for this device, we cannot guarantee shipments of either the new or legacy device alone.

    R.Fukunaga said:
    1) It is random whether the legacy chip or the new chip is installed in the LM317M.

    Yes. You can contact a TI sales representative if they can work with our planners to get you guaranteed limited quantities of a particular device type.

    R.Fukunaga said:
    2) It is not possible to determine which chip is installed based on the model number.

    Not based on the model number. The reel packaging information will describe the CSO and that will determine whether you get the new or legacy chip

    R.Fukunaga said:
    3) To determine, we need to check the CSO information described on the package at the time of delivery.

    Correct

    R.Fukunaga said:
    Is there an explanatory document showing the difference between legacy chips and new chips?

    Differences in performance are highlighted throughout the datasheet. For description of the specific design changes, TI issues Product Change Notices (PCNs). You can look at the latest PCNs to determine this.

    Regards

    Ishaan