Original Part
Alternative Part
1. LM2902KAVQDRG4 Substitution Conclusion
Direct substitution is not recommended. While both are quad-channel, wide-supply-voltage (up to 30V) operational amplifiers in SO-14 packages, they differ fundamentally in core performance. The LM2902 is a standard bipolar-input op-amp. Its input bias current (20 nA) is approximately 40,000 times higher than that of the J-FET-input LT1465 (0.5 pA). In precision applications requiring high input impedance and low input current—such as photodetection, integrators, and sensor interfaces—the LM2902 will introduce significant error currents and may fail to function correctly. Furthermore, its input offset voltage (3 mV) is substantially worse than the LT1465's 600 µV, resulting in inferior DC accuracy. Although the LM2902 offers a 1.2 MHz gain-bandwidth product and is AEC-Q100 qualified for automotive use, these advantages cannot compensate for its severe shortcomings in critical input characteristics. Therefore, it is unsuitable for circuits that rely on the core value of the LT1465.
2. LM224ADRG4 Substitution Conclusion
Direct substitution is not recommended. Similar to the LM2902, the LM224ADRG4 is a standard bipolar-input op-amp whose key parameters represent a generational gap compared to the J-FET-input LT1465. Its input bias current (15 nA) is 30,000 times higher than that of the LT1465 (0.5 pA), which fundamentally disqualifies it from any precision application sensitive to input current. Its input offset voltage (2 mV) is also significantly larger than the LT1465's, leading to inadequate DC precision. While its supply voltage range, channel count, and package are compatible, and its gain-bandwidth product (1.2 MHz) and slew rate (0.5 V/µs) are on the same order of magnitude as the original part, these similarities in general performance cannot offset the vast disparity in the input stage characteristics—the very core of an op-amp's performance. Consequently, it is not a viable substitute for the LT1465.
Analysis ID: B7B6-69CE000
Based on part parameters and for reference only. Not to be used for procurement or production.
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