Original Part
Alternative Part
1. LM2902AWYPT Substitution Conclusion
The LM2902AWYPT can serve as a conditional substitute for the OPA4243EA/250, provided electrical interface and package compatibility (both 14-TSSOP) are maintained. Key differences and their impacts are as follows:
First, supply range: the LM2902AWYPT operates from 3 V to 30 V, which is narrower than the original part’s 2.2 V to 36 V range. Direct substitution is not feasible if the original design operates below 3 V or above 30 V.
Second, quiescent power: the LM2902AWYPT’s supply current per channel is 1.5 mA, significantly higher than the original’s 45 µA per channel. This will lead to a noticeable increase in total system power consumption, making it unsuitable for battery-powered or power-sensitive applications.
Third, performance parameters: the LM2902AWYPT offers a higher gain-bandwidth product (1.3 MHz vs. 430 kHz) and slew rate (0.4 V/µs vs. 0.1 V/µs), providing better performance when handling higher frequency or faster transient signals. The slightly higher input bias current (20 nA vs. 10 nA) is unlikely to affect most applications.
Additionally, the LM2902AWYPT is AEC-Q100 qualified, making it suitable for high-reliability environments.
2. LM2902WYPT Substitution Conclusion
The published parameters of the LM2902WYPT—supply range, quiescent current, bandwidth, slew rate, etc.—are identical to those of the LM2902AWYPT. It also carries automotive-grade qualification and shares the same package.
Therefore, its feasibility as a substitute for the original OPA4243EA/250 is the same as that of the LM2902AWYPT: it can be used conditionally, provided the application circuit operates within the 3 V–30 V supply range and can tolerate the significantly higher quiescent power consumption. Its performance is superior in speed and bandwidth compared to the original, though input bias current is marginally higher.
Typically, the “A” suffix may indicate minor differences in unspecified secondary parameters, such as temperature drift or consistency. However, for the core electrical parameters relevant to this substitution assessment, the two devices can be considered equivalent.
Analysis ID: 8309-5500000
Based on part parameters and for reference only. Not to be used for procurement or production.
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