1. TS1872IYDT Substitution Conclusion The feasibility of using the TS1872IYDT as a substitute is low and requires extremely cautious evaluation. The key differences are as follows: its input bias current is as high as 70nA, which is over four orders of magnitude greater than the original part's 0.5pA. This renders it completely unsuitable for high-impedance signal sources, precision integrators, or any circuit sensitive to input current, as it would introduce significant error. Furthermore, its gain-bandwidth product (1.8 MHz) and slew rate (0.6V/µs) are only half that of the original part, which will limit the system's signal processing speed and bandwidth. Although it offers a wider operating voltage range (1.8V-6V) and is AEC-Q100 compliant, these advantages cannot offset its critical shortcomings in precision and dynamic performance. Therefore, it may only be considered for low-speed, wide-supply-voltage applications where input current sensitivity is not a concern, and where cost or automotive-grade certification is a mandatory requirement.