1. LMV321LICT Substitution Conclusion Based on core specifications and package compatibility, the LMV321LICT can serve as a direct replacement for the LMV821SQ3T2G, but only in low-frequency, low-power applications where bandwidth and slew rate are not critical. The two parts are fully compatible in terms of supply voltage range (2.7V–5.5V), package (SC-70-5), and basic functionality (single rail-to-rail output amplifier). The key technical differences are as follows: the LMV821SQ3T2G offers a higher gain bandwidth product (5.6 MHz vs. 1.3 MHz) and a faster slew rate (2 V/µs vs. 0.7 V/µs). This makes it suitable for handling higher‑frequency signals and provides faster transient response, fitting applications such as audio or medium‑speed data acquisition. In contrast, the LMV321LICT features lower input bias current (27 nA vs. 119 nA) and lower quiescent current (130 µA vs. 300 µA). It introduces less error when interfacing with high‑impedance sources and consumes less overall power, making it better suited for battery‑powered precision sensor front‑ends, low‑speed signal conditioning, and other situations where power efficiency and DC accuracy are prioritized. If the original design relies on the higher bandwidth or speed performance, substitution is not feasible. If the design emphasizes lower power consumption and lower input bias current while operating at lower signal frequencies, the replacement is acceptable.