Original Part
Alternative Part
1. TS1872AIDT Substitution Conclusion
The feasibility of substituting TS1872AIDT is low, as its key parameters present significant contradictions with the original OPA2347UA. While TS1872AIDT offers higher bandwidth (1.8 MHz vs. 350 kHz), higher slew rate (0.6 V/µs vs. 0.17 V/µs), and a wider supply voltage range (1.8–6 V vs. 2.3–5.5 V), its input bias current is 70 nA, compared to only 0.5 pA for the original part—a difference of four orders of magnitude. In applications requiring high input impedance or low leakage current, such as sensor signal conditioning or precision integrator circuits, TS1872AIDT would introduce substantial DC error or signal attenuation, compromising system accuracy beyond the original design specification.
2. LMV358IDT Substitution Conclusion
The substitution feasibility of LMV358IDT is also limited. The critical deviation lies in its input bias current (16 nA vs. 0.5 pA), which is excessively high. Although LMV358IDT outperforms the original part in offset voltage (100 µV vs. 2 mV), output current (160 mA vs. 17 mA), bandwidth (1.3 MHz), and slew rate (0.45 V/µs), the disparity in input bias current renders it unsuitable for the high-impedance or low-current sensing applications for which the original device was intended—such as photodiode amplifiers or chemical sensor interfaces. Otherwise, input current error would lead to measurement distortion or degraded stability.
Analysis ID: A6C9-B6CC000
Based on part parameters and for reference only. Not to be used for procurement or production.
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