2. MC1458D Substitution Conclusion The feasibility of substituting with the MC1458D is low and viable only under very limited conditions, as its core parameters differ significantly from the original part. The differences include: A quiescent current as high as 3.4mA (per channel), nearly ten times that of the original part (700µA total), resulting in significantly higher power consumption, making it entirely unsuitable for battery-powered or low-power designs. Its minimum operating voltage is 10V (versus 3V for the original), preventing its use in low-voltage or single-supply systems. Its input bias current (80 nA) is four times that of the original (20 nA), introducing greater error when amplifying signals from high-impedance sources. Although its slew rate and bandwidth are slightly better than the LM2904D, and it offers lower offset voltage (1 mV), these advantages are overshadowed by its high power consumption, stringent supply requirements, and similar lack of automotive-grade certification. Substitution might only be considered for high-voltage, non-power-sensitive, general industrial applications with moderate precision requirements.