1. LM2904AQS-13 Substitution Conclusion The LM2904AQS-13 is a viable direct replacement for the original LM2904DG4, as the two are fully compatible in key electrical parameters—such as gain bandwidth product, slew rate, and output current—as well as in package footprint. The differences are as follows: First, the input offset voltage of the LM2904AQS-13 is 2 mV (compared to 3 mV for the original part), which may provide better DC performance in applications requiring high‑precision signal amplification. Second, its supply voltage range is extended to 2 V–36 V (versus 3 V–26 V for the original), offering wider operating voltage adaptability, especially suitable for low‑voltage or wide‑supply scenarios. Third, the quiescent current increases to 700 µA per channel (original: 500 µA), raising power dissipation by approximately 40% under equivalent conditions, which may affect battery‑operated system runtime. Fourth, the LM2904AQS-13 is AEC‑Q100 qualified for automotive applications, making it suitable for high‑reliability environments such as automotive systems, whereas the original part is an industrial‑grade device. In summary, if the application is not power‑sensitive and requires either wide supply voltage or automotive‑grade reliability, the LM2904AQS-13 is an ideal substitute. If the original design has strict power constraints, the impact of increased quiescent current should be carefully evaluated.