1. LM2904DT Substitution Conclusion Direct substitution is not viable. The LM2904DT exhibits significant deficiencies in key precision and dynamic performance parameters compared to the OP213ESZ. Its input offset voltage (2 mV) is 20 times higher than that of the OP213ESZ (100 µV), introducing substantially greater error in DC or low-frequency amplification applications and severely degrading system accuracy. Its gain-bandwidth product (700 kHz) and slew rate (0.6 V/µs) are only approximately one-fifth and one-half of the OP213ESZ's specifications, respectively, leading to a marked reduction in signal processing speed and large-signal frequency response capability. Furthermore, its output is single-ended rather than rail-to-rail, limiting the output dynamic range and preventing full utilization of the supply voltage. The LM2904DT is suitable only for applications with minimal requirements for precision, bandwidth, and output swing, and cannot meet the design requirements intended for the original part.