1. Substitution Conclusion for AZV321KSTR-G1 The AZV321KSTR-G1 demonstrates high compatibility with the original TSV851AICT in terms of package, supply voltage, and quiescent current, making it a viable substitution candidate. However, key performance differences must be considered. Its input offset voltage (1.7 mV) is significantly higher than that of the TSV851AICT (800 µV), which may degrade DC accuracy. Additionally, the higher input bias current (250 nA) can affect measurement accuracy from high-impedance signal sources. Conversely, the AZV321KSTR-G1 offers advantages in dynamic performance, featuring a higher slew rate (1V/µs) and greater output current drive capability (160 mA), which benefit transient response and load driving. For applications sensitive to DC precision and input bias current, such as sensor signal conditioning, this substitution may not be ideal. However, if the design prioritizes drive strength and transient response, and can tolerate some compromise in accuracy, the AZV321KSTR-G1 presents a feasible alternative.