2. NJM3404AD Substitution Conclusion Substituting the LM358P with the NJM3404AD requires careful evaluation and is only viable in specific, non-critical applications rather than as a direct drop-in replacement. Although the packages are compatible (both 8-DIP), several key technical differences exist. The NJM3404AD features a higher slew rate (1.2V/µs) and gain bandwidth product (1.2MHz), offering superior response in high-frequency or fast-slewing signal applications compared to the LM358. However, if the original circuit design relies on the LM358's slower speed for compensation or filtering, direct substitution may introduce stability issues, such as oscillation. Its input bias current (70nA) is 3.5 times that of the LM358 (20nA), which can generate a larger input error voltage in high-impedance source applications. The quiescent current (2mA) is significantly higher than the LM358's (1mA), making it less suitable for battery-powered designs. Additionally, its output drive current (30mA) is slightly lower. A thorough verification against the specific application circuit—particularly regarding signal frequency, source impedance, power consumption, and load requirements—is mandatory prior to substitution.