This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

[FAQ] LM4121: What are the best options to replace the adjustable version of LM4121?

Part Number: LM4121
Other Parts Discussed in Thread: REF35, REF4132


I am looking to replace LM4121IM5-ADJ/NOPB, LM4121AIM5-ADJ/NOPB, or LM4121IM5X-ADJ/NOPB with another solution from TI. What are my options?

Thank you.

  • Hello,

    TI has many fixed output voltage series references and adjustable shunt references that we can recommend as alternative solutions to these devices.

    You can consider a fixed voltage output series voltage reference. This would be the easiest replacement. Depending on the voltage level needed, there is a possibility of a drop-in solution. I’ve attached some information that shows examples of where that may be possible when replacing LM4121-ADJ.

    In my opinion, REF4132 typically is the best alternative option. Additionally, REF35 offers the most output voltage variants and has the lowest quiescent current. If a high input voltage is used, then REF34xxT is the best alternative.

    If it is preferred to preserve the adjustable functionality, then TI has many different shunt voltage references that may work as an alternative solution, depending on your accuracy needs. A shunt voltage reference most likely will not provide a pin-to-pin or drop-in solution, but I am positive we have plenty of options that will work as an alternative solution to LM4121-ADJ. Here is more information on TI’s shunt reference portfolio:

    We do not have an adjustable pin-to-pin replacement for LM4121IM5-ADJ/NOPB. However, depending on the accuracy needs and expected output voltage, there are many options available from TI that will likely work as an alternative solution.



    REF4132 vs REF35 vs REF34xxT vs LM4121-ADJ.pptx