1. ADA4891-4ARZ Substitution Conclusion Direct replacement is not feasible. This part represents a high-performance alternative suitable for non-automotive applications that demand extremely high bandwidth and speed, and where increased power consumption is acceptable. There are significant differences in core performance parameters compared to the original part (TSV854IDT). Its gain bandwidth product (105 MHz vs. 1.3 MHz) and slew rate (210 V/µs vs. 0.7 V/µs) are two orders of magnitude higher, enabling it to handle high-frequency signals and fast transients. However, this comes at the cost of a substantial increase in quiescent current (4.4mA vs. 130µA per channel), leading to significantly higher power dissipation. Furthermore, its very low input bias current (2 pA vs. 27 nA) is beneficial for high-impedance sensor interfaces. A critical shortcoming is the lack of AEC-Q100 automotive-grade qualification, making it unsuitable for applications requiring the reliability standards of automotive electronics, which the original design may have mandated.