1. INA154U/2K5 Substitution Conclusion The INA154U/2K5 can serve as a functional substitute for the AD629BRZ in certain high-performance scenarios. However, significant differences exist in key electrical characteristics, making it a non-direct, non-universal, pin-compatible replacement. Substitution requires careful evaluation of system compatibility. The differences are as follows: First, core functionality and common-mode voltage range. The AD629BRZ is a dedicated current-sense amplifier designed to withstand common-mode voltages up to ±270V. In contrast, the INA154U is a general-purpose differential amplifier whose common-mode range is typically close to the supply rails. Therefore, the INA154U cannot replace the AD629BRZ in current-sensing applications with high common-mode voltages, such as motor control or power supplies. Second, quiescent power consumption and minimum operating voltage. The INA154U's quiescent current (2.4mA) is 2.7 times that of the AD629BRZ (900µA). Furthermore, its minimum operating voltage (8V) is higher than the AD629BRZ's (5V). Consequently, in low-power or single 5V supply systems, the INA154U may be inoperable or significantly reduce battery life. Third, dynamic performance. The INA154U offers higher bandwidth (3.1 MHz vs. 500 kHz) and slew rate (14V/µs vs. 2.1V/µs), which can be a beneficial performance improvement for signal conditioning requiring fast response. However, its larger output current capability (60 mA vs. 25 mA) may necessitate additional attention to stability when driving capacitive loads. The substitution decision must be based on whether the application involves high common-mode voltage, whether the system supply voltage and power budget allow for the INA154U's requirements, and confirmation of full pinout compatibility.