1.can any one tell me which is the better one. LM124 or OP467?or any other quad opamp?
2. can any body suggest a replacement for ISO120 isolation amplifier?
What are your supply rails? The LM747 will tolerate 22V supplies, which is more than most opamps will take.
The AD8513, AD8674 and OP470 may be worth a look as they all have better performance. I don't know about Mil spec though.