2. INA118UB/2K5 Substitution Conclusion Conditionally feasible, suitable for low-power, low-voltage scenarios, but dynamic performance must be evaluated. The primary advantage of the INA118UB/2K5 is its extremely low quiescent current (350µA vs. 900µA), which significantly reduces system power consumption. Its lower supply voltage extends down to 2.7V, making it better suited for battery-powered or low-voltage applications. However, it compromises on key dynamic parameters: lower slew rate (0.9V/µs vs. 1.2V/µs) and reduced output current capability (12mA vs. 18mA) limit its ability to handle fast signals or drive low-impedance loads. Its input bias current (1nA) is also higher than the original part, potentially introducing error in applications with higher source impedance. Substitution is acceptable if the application is power-sensitive and signals are slow-changing; it is not recommended for high-speed or high-drive requirements.