1. LM2904FJ-E2 Substitution Conclusion Conclusion Summary: The LM2904FJ-E2 can serve as a generally viable substitute for the LM2904DR, particularly in applications requiring higher input precision or a wider operating voltage range. However, direct substitution may pose risks in applications demanding maximum output drive capability, necessitating focused evaluation. 1. Input Offset Voltage: The Rohm part (1 mV) is superior to the TI part (3 mV). The LM2904FJ-E2 offers higher initial accuracy for amplifying DC or low-frequency small-signals, helping to reduce undesired output zero error. 2. Gain Bandwidth Product (GBWP): The Rohm part (800 kHz) is slightly higher than the TI part (700 kHz). At the same closed-loop gain, the LM2904FJ-E2 can provide marginally higher signal bandwidth or phase margin, though this difference is typically insignificant for most general-purpose applications. 3. Output Current (per Channel): The Rohm part (30 mA) is lower than the TI part (40 mA). This is the most critical limiting difference. The LM2904FJ-E2 has a weaker capability to drive heavy loads (e.g., low-impedance loads, capacitive loads). When substituting in scenarios driving relays, LED arrays, or long cables, it may lead to increased output voltage drop, waveform distortion, or stability issues. 4. Total Supply Current: The Rohm part is specified as 600µA (it is not explicitly stated whether this is per channel), while the TI part is clearly specified as 500µA per channel (approximately 1mA total for the dual channel). The specification methods differ for this parameter, but the overall power dissipation is of the same order of magnitude, resulting in a minor impact on system power consumption. 5. Supply Voltage Range: The Rohm part (32 V) is superior to the TI part (26 V). The LM2904FJ-E2 offers better adaptability in systems with higher single-supply or split-supply voltages. Substitution Recommendation: If the original application circuit operates below 26V and does not place high demands on the op-amp's output current (significantly below 30mA), direct substitution is possible and can benefit from the improved input precision. If the original design relies on output drive capability close to 40mA, it is essential to re-validate the load-driving performance and stability of the circuit after substitution.