1. LMV821SQ3T2G Substitution Conclusion The LMV821SQ3T2G (onsemi) is highly compatible with the original part LMV821ICT (ST) in terms of package and core electrical characteristics, making it a viable drop-in replacement. However, attention must be paid to the impact of key parameter differences on specific applications: - Advantages: Input offset voltage is significantly lower (1 mV vs. 3.5 mV), which benefits high-precision signal processing. Gain bandwidth and slew rate are slightly improved (5.6 MHz / 2 V/µs vs. 5.5 MHz / 1.9 V/µs), offering marginally better dynamic performance. - Points to verify: Input bias current is higher (119 nA vs. 60 nA), which may increase DC error in applications such as high-impedance sensor interfaces. Output drive capability is reduced (45 mA vs. 70 mA), making it unsuitable for medium-to-high load current scenarios. Minimum operating voltage is raised (2.7 V vs. 2.5 V), limiting its use in ultra-low-voltage systems. Overall, the LMV821SQ3T2G can be safely substituted in applications not requiring extreme parameters—such as general portable device signal conditioning or low-load ADC buffering. However, if the design involves high output current, very low supply voltage, or ultra-high input impedance, compatibility should be re-evaluated.