Replacement for MC34072P Op Amp
The MC34072P appears to be at End of Life.

Two available options that are (nearly) equivalent include MC34072PG, and MC34072VPG, as well as MC33072PG.

You can see the results of my search here at this page on Mouser.
On that page, you can broaden the parameters (i.e., remove some of the filters) to see more part options.

Method of searching for parts similar to any PartXYZ, for the future


You can use the Search tool of a seller/distributor website like Mouser or Digikey.
Find page of PartXYZ on the website.
Go to the parent category containing the part, ideally in a new window/tab.
Then on this category listing page, you will see a Search tool (which will now search within the category you just chose).
For the Filter parameter options, set the parameters equal to the ones of PartXYZ, especially the parameters that are important to you.
The Search tool of the website should now give you various options similar to, and including, PartXYZ.


Specs to look for in opamps:
Gain, Bandwidth, Noise, Offset voltage/current/drift, Bias current, Output impedance, Slew rate, CMRR, Packaging, Price
... And so on; depends on what your application needs really.