1. LM258DMR2G Substitution Conclusion Direct substitution is not recommended. There exists a generational performance gap between the LM258DMR2G and the ADA4062-2ARMZ-RL. The key differences lie in the input bias current (45nA vs. 2pA, a difference of four orders of magnitude) and input offset voltage (2mV vs. 750µV). These parameters define the LM258 as a general-purpose, low-cost bipolar op-amp, whereas the ADA4062 is a precision amplifier featuring a JFET input stage. The LM258's significantly higher input bias current will notably degrade measurement accuracy from high-impedance sensor sources and introduce substantial offset error. In contrast, the ADA4062's ultra-low input current and lower offset voltage make it suitable for applications demanding high input impedance and precision, such as photodetection and integrator circuits. Furthermore, the ADA4062 offers a higher maximum supply voltage (36V vs. 32V), superior slew rate (3.3V/µs vs. a typical 0.3-0.6V/µs range), and lower quiescent current. These disparities mean the LM258DMR2G can only serve as a functional placeholder in general-purpose signal conditioning scenarios where input error, speed, and supply requirements are highly non-critical. It cannot achieve performance parity.