Depends on the circuit and how it's being used. In most cases, yes it might be fine, in a few cases maybe not as well. Can you tell us what it's being used in or better yet a circuit diagram?Can i use 1N4001 Diode instead of 1N457 Diode because i dont have it in egypt ?
The 1N457 is a small signal diode..
A 1N4001 should work fine in that circuit. The op amp is configured as a current sensing switch as explained at the top of the diagram. Looks like a pretty good circuit.