1. INA149AMDREP Substitution Conclusion The INA149AMDREP cannot directly replace the MC33071DR2G due to fundamental differences in their core architecture and application positioning. Key distinctions include: amplifier type (the INA149 is a differential amplifier, specifically designed for high common‑mode voltage rejection and differential signal amplification, whereas the MC33071 is a general‑purpose single‑ended operational amplifier suitable for conventional signal conditioning), bandwidth and slew rate (the INA149’s –3 dB bandwidth of 500 kHz and slew rate of 5 V/µs are significantly lower than the MC33071’s 4.5 MHz gain‑bandwidth product and 13 V/µs slew rate, implying inadequate performance in high‑frequency or fast‑transient applications), and supply range (the INA149 operates from 4 V to 36 V, a narrower range compared to the MC33071’s 3 V to 44 V, which restricts flexibility in low‑voltage or high‑voltage supply scenarios). These differences confirm that the INA149 is suitable only for specific applications such as differential signal acquisition and cannot fulfill the broad range of functions expected from a general‑purpose op‑amp.