Original Part
Alternative Part
1. LM2902AQS14-13 Substitution Conclusion
Direct substitution is not recommended. While the package is compatible and the output voltage range covers that of the original part, there are significant differences in core performance. The key distinction is that the LM2902AQS14-13 is a general-purpose op-amp with a BJT input stage, not a JFET-type amplifier. This results in an input bias current (20 nA) that is 2000 times higher than the LF444CM's 10 pA, introducing substantial error in precision applications requiring high input impedance and low input current—such as sensor interfaces or integrator circuits. Additionally, its bandwidth (700 kHz) and slew rate (0.3 V/µs) are relatively low, limiting its capability in high-frequency and fast-signal processing. Its advantages include compliance with the automotive AEC-Q100 standard and higher output current, making it suitable only for general amplification applications where input error is not critical and automotive-grade qualification is specifically required.
2. LM2902EDR2G Substitution Conclusion
Not suitable for substitution. Apart from package compatibility, there is a fundamental mismatch in key electrical parameters. Similar to the above part, its general-purpose BJT input stage results in an input bias current (90 nA) that is four orders of magnitude (9000 times) higher than that of the original device. This completely negates the core advantages of a JFET op-amp—ultra-high input impedance and ultra-low input current—rendering it unusable in any precision measurement circuit. Furthermore, its unspecified slew rate typically indicates more conservative performance, and its supply voltage range (3 V to 32 V) does not fully cover the original part’s 36 V requirement. This device should only be considered a general-purpose quad-channel amplifier and cannot fulfill the intended function in circuits that rely on JFET characteristics.
Analysis ID: 3C84-3D1F000
Based on part parameters and for reference only. Not to be used for procurement or production.
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