Original Part
Alternative Part
1. LM2904DGKR Substitution Conclusion
Direct substitution is not recommended due to significant differences in key dynamic performance parameters. The LM2904DGKR exhibits lower gain-bandwidth product (700 kHz) and slew rate (0.3 V/µs) compared to the original part (1 MHz, 0.6 V/µs). This will degrade its response speed and bandwidth capability when processing high-frequency or fast-changing signals, potentially affecting circuit performance in high-frequency or high-speed transient applications. Although it offers superior input bias current (20 nA) and offset voltage (3 mV), which can improve DC accuracy, and features lower quiescent current (500 µA/channel) for better power efficiency, the shortcomings in dynamic performance prevent it from serving as an equivalent replacement in applications demanding bandwidth and speed.
2. LM258PT Substitution Conclusion
Substitution is electrically feasible, but package compatibility must be verified. The LM258PT has comparable gain-bandwidth product (1.1 MHz) and slew rate (0.6 V/µs) to the original part, along with similar output current (40 mA) and supply voltage range (3–30 V). This allows it to maintain close frequency response and load-driving capability in most general-purpose amplifier circuits. It also offers better input bias current (20 nA) and lower static power consumption (700 µA/channel), and carries the AEC-Q100 automotive-grade qualification for higher reliability. The main difference lies in its package: the LM258PT comes in a slightly wider 8-TSSOP (4.40 mm) outline. Substitution can be successful if PCB layout space permits; however, if the original design was optimized for the more compact 8-MSOP (3.00 mm width), PCB adjustments will be required.
Analysis ID: DDE2-E4E6000
Based on part parameters and for reference only. Not to be used for procurement or production.
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