1. LT1810IMS8 Substitution Conclusion Direct substitution is not recommended. Although the two devices share package compatibility and have partially overlapping supply voltage ranges, their core performance characteristics are fundamentally different: the OPA2703 is a micropower, high-precision CMOS amplifier (quiescent current only 160 µA, input bias current 1 pA), while the LT1810 is a high‑speed, high‑output‑drive amplifier (180 MHz bandwidth, 350 V/µs slew rate, 15 mA quiescent current). A direct replacement would increase system power consumption by nearly two orders of magnitude, potentially exceeding the headroom of the power supply design. Moreover, the LT1810’s input bias current (2 µA) is six orders of magnitude higher than that of the OPA2703, which would introduce significant DC error and render it unsuitable for precision applications such as high‑impedance sensor signal conditioning. Its ultra‑high‑speed nature could also introduce stability risks (e.g., oscillation), necessitating a thorough review of PCB layout and filter design. Substitution may be considered only in applications that strictly require high speed and high output drive, with relaxed demands on power consumption and precision—and even then, full system validation is mandatory.