Original Part
Alternative Part
1. LM2904ST Substitution Conclusion
The LM2904ST is fundamentally compatible with the original LM258DGKRG4 in key parameters, including gain-bandwidth product (700 kHz), input bias current (20 nA), and supply voltage range (3‑30V vs. 3‑32V). It offers a higher slew rate (0.6 V/µs), enabling faster dynamic signal response. The main differences are its lower output current (30 mA vs. 40 mA), which may slightly reduce high-load drive capability, and a somewhat higher quiescent current (700 µA vs. 500 µA × 2), leading to increased power dissipation. If the application does not demand maximum output current and is not highly sensitive to power consumption, the LM2904ST can serve as a direct substitute, though load drive and thermal performance should be verified.
2. LM258DMR2G Substitution Conclusion
The LM258DMR2G provides a higher gain-bandwidth product (1 MHz) than the original part (700 kHz), making it suitable for slightly higher-frequency applications. However, its input bias current (45 nA) is notably higher than the original’s (20 nA), which may introduce greater error in high-impedance circuits. The slew rate is unspecified, so transient response capability requires careful evaluation. The supply range (3‑32V) and output current (40 mA) match the original, but the quiescent current (800 µA × 2) is higher, increasing power dissipation. If the application does not rely on high input precision or low bias current and can tolerate the additional power consumption, the LM258DMR2G can be used as a replacement; however, error impact must be reassessed in high-precision scenarios.
Analysis ID: FC7F-AD3C000
Based on part parameters and for reference only. Not to be used for procurement or production.
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