1. AS358P-E1 Substitution Conclusion The AS358P-E1 is not recommended as a direct replacement for the NJM5532DD due to significant differences in key performance parameters, which may lead to degraded system performance. The primary distinctions are as follows: First, the AS358P-E1 does not specify slew rate or gain-bandwidth product (GBW), whereas the NJM5532DD’s slew rate of 8 V/µs and bandwidth of 10 MHz indicate suitability for medium- to high-speed signal processing (e.g., audio, filter circuits). The absence of these specifications suggests the AS358P-E1 may only support low-frequency applications. Second, the input offset voltage of the AS358P-E1 (2 mV) is four times higher than that of the NJM5532DD (500 µV), introducing greater DC error and making it unsuitable for precision amplification or sensor signal conditioning where accuracy is critical. Third, the quiescent current of the AS358P-E1 (0.7 mA) is significantly lower than that of the NJM5532DD (9 mA). While this benefits low-power designs, it typically comes at the expense of bandwidth and drive capability. Additionally, the supply voltage range of the AS358P-E1 (3–36 V) is slightly narrower than that of the original device (6–44 V), limiting its use in higher-voltage applications. In summary, the AS358P-E1 may be considered as a substitute only in low-frequency, general-purpose circuits where bandwidth and precision are not critical and power consumption is prioritized; otherwise, circuit performance should be re-evaluated.