Original Part
Alternative Part
1. LM2904DG4 Substitution Conclusion
The LM2904DG4, as a general-purpose dual op-amp, is not a direct substitute for the zero-drift amplifier TC913BCOA713. The key differences are as follows: the LM2904DG4's input offset voltage (3 mV) is 200 times higher than that of the TC913BCOA713 (15 µV), its input bias current (20 nA) is approximately 160 times higher, and its bandwidth (700 kHz) and slew rate (0.3 V/µs) are both lower. In applications requiring high precision and low drift, such as sensor signal amplification and precision measurement, the LM2904DG4 would introduce significant DC error and temperature drift. Its slower dynamic response may also result in system performance that fails to meet accuracy and stability requirements.
2. LM2904QDRG4 Substitution Conclusion
The LM2904QDRG4 shares essentially identical parameters with the LM2904DG4 and is likewise unsuitable for replacing the TC913BCOA713. The critical differences remain the same as described above: its input offset voltage and bias current are significantly higher than those of the zero-drift amplifier, while its bandwidth and slew rate are lower. Although both devices share the same package and offer a wider supply voltage range (3 V to 26 V), the LM2904QDRG4 remains fundamentally a general-purpose op-amp lacking zero-drift architecture. It cannot achieve the microvolt-level offset and picoamp-level bias current characteristics of the TC913BCOA713. Consequently, it is not recommended for applications with stringent requirements for long-term drift and amplification of very small signals.
Analysis ID: FC07-763A000
Based on part parameters and for reference only. Not to be used for procurement or production.
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