Original Part
Alternative Part
1. LM258DGKR Substitution Conclusion
This component is a viable substitute and represents a performance upgrade. The LM258DGKR matches or exceeds the original part in all key specifications: its higher gain-bandwidth product (700kHz vs. 500kHz) and slew rate (0.3V/µs vs. 0.2V/µs) enable faster signal response and processing, making it suitable for higher frequency applications or those requiring quicker step response. The increased output current (40mA vs. 30mA) provides stronger load-driving capability. Its operating voltage range (3V to 32V) remains identical to the original, ensuring full power supply compatibility. The package is also the same—8-pin MSOP/VSSOP with industry-standard pinout—allowing for direct drop-in replacement. The primary deviation is its slightly higher input offset voltage (3mV vs. 2mV), which should be considered in applications demanding ultra-high DC precision, though this difference is negligible in most general-purpose amplifier circuits.
2. LM2904DGKR Substitution Conclusion
Substitution is feasible provided the operating voltage does not exceed 26V. The LM2904DGKR shares the same core AC performance (bandwidth and slew rate) as the LM258DGKR and outperforms the original part in these respects. Two key differences exist compared to the original: first, its maximum supply voltage is 26V, lower than the original’s 32V. If the existing circuit operates between 26V and 32V, substitution is strictly prohibited due to overvoltage damage risk. Second, the LM2904DGKR is explicitly specified with a “push-pull” output stage, whereas the original part does not state this. This suggests the LM2904DGKR may offer better output symmetry, potentially improving capacitive load drive or output swing closer to the rails. Other parameters, including output current (30mA), are equivalent. Substitutability is highly dependent on the actual operating voltage in the application.
Analysis ID: 56F3-18A3000
Based on part parameters and for reference only. Not to be used for procurement or production.
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