Renesas Electronics produces a range of semiconductor products. A product they used to produce but no longer do is the CA3140E general-purpose op-amp, which remains in use in a lot of older and vintage electronics. We sometimes get requests for this device from folks looking to repair old equipment, often in the form of “Can I use this CA3140EZ thing, instead?”
Yes, you can! The "Z’ is simply an indicator that the part has been updated to be RoHS compliant. The product is otherwise a drop-in replacement for the discontinued non-RoHS part, and should be fine to replace the older product with in your electronics repairs.