Original Part
Alternative Part
1. LM2902QDRG4Q1 Substitution Conclusion
As an AEC-Q100 qualified automotive-grade device, the LM2902QDRG4Q1 can functionally replace the NJM3403AM, but its key parameter differences require careful evaluation. The primary distinctions are as follows: First, its supply voltage range (3-26V) is narrower than that of the original part (4-36V). Direct substitution is not feasible if the original circuit operates near or above 26V. Second, its slew rate (0.5 V/µs) is only half that of the original (1.2 V/µs), reducing the maximum rate for handling rapidly changing signals. This may lead to reduced large-signal bandwidth or waveform distortion in high-speed applications. Its advantages include a lower input bias current (20 nA), which is beneficial for high-impedance signal sources, and a higher output current (60 mA), providing greater drive capability. It also features a nominally better quiescent current specification.
2. LM2902DRG3 Substitution Conclusion
The LM2902DRG3 is essentially identical in electrical performance to the LM2902QDRG4Q1 (except for output current), so its feasibility and limitations for replacing the NJM3403AM are highly similar. Its supply voltage range (3-26V) is also narrower than the original part's, and its slew rate (0.5 V/µs) is similarly lower. These characteristics respectively limit its direct replacement in applications requiring higher operating voltages or higher speed. The main differences from the Q1 version are its output current of 30 mA—matching the original part—and its lack of automotive qualification. In non-automotive, medium-to-low-speed general-purpose amplifier circuits where operating voltage and signal speed requirements are met, it presents a viable alternative. However, verifying that the voltage and slew rate meet system requirements remains the priority.
Analysis ID: 136C-03B4000
Based on part parameters and for reference only. Not to be used for procurement or production.
SkyChip © 2026, Email: sales@skychip.com