1. TSV358IDT Substitution Conclusion The TSV358IDT cannot directly replace the AD8646ARZ-REEL7. It is only suitable for simple signal conditioning applications that are low-speed, low-precision, cost-sensitive, and require automotive-grade qualification. The key differences are: its gain bandwidth product (1.4 MHz vs. 24 MHz) and slew rate (0.6 V/µs vs. 11 V/µs) are significantly lower than the original part, rendering it incapable of processing high-frequency or fast transient signals; its input bias current (70 nA vs. 0.3 pA) is orders of magnitude higher, leading to substantially increased DC error with high-impedance signal sources; its output current (80 mA vs. 120 mA) and supply current (500 µA vs. 3 mA total power consumption) are also lower, limiting drive capability and dynamic performance. Its sole advantages are compliance with the AEC-Q100 automotive standard and a slightly wider supply voltage range (2.5-6 V), but the core performance gap remains substantial.