Original Part
Alternative Part
1. LM2904YST Substitution Conclusion
From a core parameter perspective, the LM2904YST can serve as a substitute for the LM258DMR2G, albeit with some performance compromises and different target applications. Key differences include a lower gain-bandwidth product (700kHz vs. 1MHz) and weaker output drive capability (30mA vs. 40mA). Consequently, its performance will be slightly inferior to the original part in high-frequency signal processing or when driving heavier loads. It offers a defined speed specification (slew rate of 0.6V/µs) and features lower input bias current (20nA), which benefits precision in high-impedance signal scenarios. Crucially, it is AEC-Q100 automotive-grade qualified, making it a more suitable or mandatory choice for automotive or industrial applications with stringent reliability requirements, whereas the original part is general-purpose grade. For applications with low frequency, light loads, and no automotive certification requirement, it can be directly substituted. If automotive qualification is required, it becomes the superior choice.
2. AS358MMTR-G1 Substitution Conclusion
The AS358MMTR-G1 closely matches the basic electrical parameters of the original part, LM258DMR2G, making it an excellent direct replacement option. Its primary advantages are a wider supply voltage range (up to 36V vs. 32V) and lower input bias current (20nA vs. 45nA), enabling operation under broader supply conditions and providing better DC accuracy in high-impedance applications. Its supply current and output current capabilities are comparable to the original part, and the package is fully compatible. A key drawback is the absence of specified dynamic performance parameters, namely gain-bandwidth product (GBWP) and slew rate. This introduces uncertainty regarding its AC performance (such as bandwidth and transient response). For applications requiring defined frequency response, verification through bench testing or obtaining a detailed datasheet is necessary. For applications without high-frequency requirements, it can be directly replaced.
Analysis ID: 7E00-72E6000
Based on part parameters and for reference only. Not to be used for procurement or production.
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