The opa604in my kav300il is like 20yrs old. So i am thinking if i should replace it. But i wonder if replacing it with another model (opa627 seems to be a better one) will have any difference.
I have used both in the past ,the OPA627 was the generally "upmarket " version of the OPA604 it was also dearer (at the time ).
Have a look at the OPA1611OPA1612.
Have a look at the OPA1611OPA1612.
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A common reason to choose the opa604 was its higher rail voltage ability. So double check that.
If it's running at under +/-18V, the opa1641 is a good modern fet opamp. If you don't know exactly the circuitry around the opamp, it's best to change to the same type (fet opamp for fet, bjt for bjt).
But unless used sub optimally, the opa604 really isn't that bad and the difference might be quite small.
If it's running at under +/-18V, the opa1641 is a good modern fet opamp. If you don't know exactly the circuitry around the opamp, it's best to change to the same type (fet opamp for fet, bjt for bjt).
But unless used sub optimally, the opa604 really isn't that bad and the difference might be quite small.
The OPA1611/1612 are bipolar amps, is not always advisable to replace a FET opamp with a bipolar one, the original circuit might have larger resistors which would increase noise due to the higher input noise current of bipolar opamps or may increase offset voltage due to higher input bias current. My advice is to replace FET opamps with FET opamps.However, why do you want to replace the opamps? if it ain't broke why fix it?