1. OPA703NA/250 Substitution Conclusion Direct substitution is not viable. The OPA703NA/250 and the original LT6202IS5 exhibit significant discrepancies in key performance parameters, representing fundamentally different operational amplifier types. The OPA703NA/250 features a gain bandwidth product of merely 1 MHz and a slew rate of 0.6 V/µs, compared to 100 MHz and 25 V/µs for the LT6202, respectively. Consequently, the OPA703NA/250 is entirely incapable of handling the high-frequency or fast-slewing signals required by the original design, with a potential application bandwidth difference of two orders of magnitude. While the OPA703NA/250 holds distinct advantages in input bias current (1 pA vs. 3.8 µA), input offset voltage (160 µV vs. 2.6 mV), and quiescent current (160 µA vs. 2.8 mA), this essentially constitutes a trade-off, replacing "high-speed" characteristics with "ultra-low power, high-precision" ones. Furthermore, its output voltage range (4-12V vs. 2.5-12.6V) is narrower, and its output drive capability (10 mA vs. 40 mA) is weaker. Forced substitution would most likely result in circuit failure in terms of frequency response, transient response, and dynamic range.