1. TS512IYDT Substitution Conclusion The TS512IYDT can serve as a limited substitute for the LF412CDG4, provided the application is rigorously evaluated. Key differences include: First, the input bias current differs significantly (50 nA for TS512IYDT vs. 50 pA for LF412CDG4), making the former unsuitable for applications extremely sensitive to input current, such as high-impedance sensor signal amplification. Second, the slew rate is lower (1.5 V/µs for TS512IYDT vs. 13 V/µs for LF412CDG4), which may lead to distortion in high-frequency or fast-transient signals. Third, the supply current of the TS512IYDT (500 µA per channel) is considerably lower than that of the LF412CDG4 (4.5 mA per channel), making it suitable for low-power designs, though its output drive capability is weaker (23 mA). Fourth, the operating voltage range of the TS512IYDT (3–30 V) is compatible with lower-voltage systems, though its upper limit is slightly lower than that of the LF412CDG4 (7–36 V). Additionally, the TS512IYDT is AEC-Q100 qualified for automotive applications, making it suitable for automotive environments. In summary, substitution is feasible if the application has relaxed requirements for input bias current and slew rate, and prioritizes low power consumption or automotive reliability; otherwise, careful verification is necessary.