1. INA126UA/2K5 Substitution Conclusion The INA126UA/2K5 can serve as a conditional substitute for the AMP04FSZ-RL, suitable for applications where high precision and speed are not critical but low power consumption and a wide supply voltage range are emphasized. The key differences are as follows: First, its -3dB bandwidth (200kHz) is significantly lower than that of the AMP04 (700kHz). Consequently, it cannot process high-frequency signals at the same rate, resulting in slower dynamic response. Second, its input offset voltage (150µV) is five times that of the AMP04 (30µV). This directly introduces a larger inherent error at the system output when amplifying weak DC or low-frequency signals, degrading measurement accuracy. Third, its output drive current (10mA) is only one-third of the AMP04's (30mA), indicating weaker capability to drive low-impedance loads. However, the INA126UA's quiescent current (175µA) is substantially lower than the AMP04's (750µA), offering a distinct power-saving advantage. Furthermore, its operating voltage range (2.7V to 36V) is wider, with particular support for single-supply operation as low as +3V. This provides better compatibility for battery-powered or low-voltage systems.