1. ADA4807-2ARMZ Substitution Conclusion The ADA4807-2ARMZ outperforms or matches the original LMH6643QMM/NOPB in most key parameters, making it a highly viable substitute. However, note that it lacks automotive-grade qualification. Specific differences include: the ADA4807-2ARMZ offers higher bandwidth (180 MHz vs. 130 MHz) and slew rate (250 V/µs vs. 135 V/µs), providing superior high-speed signal handling; lower input offset voltage (140 µV vs. 1 mV) and input bias current (1.2 µA vs. 1.6 µA) improve DC accuracy; and lower supply current (1 mA/ch vs. 2.7 mA/ch) benefits low-power designs. The original part is AEC‑Q100 qualified and suitable for automotive electronics, whereas the ADA4807-2ARMZ does not carry automotive certification—caution and additional validation are advised for automotive or high-reliability applications. For industrial or consumer designs with higher performance and lower power requirements, the ADA4807-2ARMZ can be considered a direct upgrade.