Replacing LM324N with Better Opamp

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Can PNP input opamps be replaced with NPN input ones?
I want to replace the LM324N with something better.
 
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m718 said:
Can PNP input opamps be replaced with NPN input ones?
I want to replace the LM324N with something better.

A FET rail-to-rail opamp would be able to replace the 324. The PNP topology was just used for some applications before good FET opamps were viable.
 

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