1. AD629ARZ-R7 Substitution Conclusion Direct substitution is not feasible, though functional replacement may be considered under strict evaluation. The core distinction lies in the fact that the INA154U is a general-purpose differential amplifier, whereas the AD629 is a dedicated current-sense amplifier. Key differences include: First, the bandwidth (500 kHz) and slew rate (2.1 V/µs) of the AD629 are significantly lower than those of the INA154U (3.1 MHz, 14 V/µs). When processing high-frequency or fast-transient signals, the AD629 will cause substantial degradation in dynamic response. Second, the input offset voltage of the AD629 (200 µV) is double that of the INA154U (100 µV), introducing greater error in applications requiring high DC accuracy. Third, the output current capability of the AD629 (25 mA) is lower than that of the INA154U (60 mA), resulting in weaker drive capability for low-impedance loads. The AD629 offers advantages in supply current (900 µA vs. 2.4 mA) and minimum operating voltage (5V vs. 8V). Substitution may only be considered if the original circuit is used for low-speed, high common-mode voltage current sensing and does not rely on high bandwidth, high precision, or strong drive capability. Otherwise, system performance degradation or failure is likely.