1. TSV358AIDT Substitution Conclusion The TSV358AIDT can directly replace the AD8646ARZ in several basic parameters (dual‑channel, rail‑to‑rail output, SOIC‑8 package, and a wider supply range). However, there is a significant performance gap in key specifications: its gain‑bandwidth product (1.4 MHz vs. 24 MHz) and slew rate (0.6 V/µs vs. 11 V/µs) are far lower than those of the original part. Consequently, it is completely unsuitable for high‑frequency signals or fast‑slewing waveforms and is limited to low‑frequency or DC applications. Moreover, its input bias current (70 nA vs. 0.3 pA) is orders of magnitude higher, which will introduce non‑negligible errors in circuits with high‑impedance signal sources. Its advantages lie in lower quiescent current (500 µA vs. 3 mA) and automotive‑grade reliability (AEC‑Q100). Therefore, substitution is recommended only in non‑critical applications where speed and precision are extremely low priority, but power consumption and long‑term durability are key concerns.