1. SPC5643LFF2MLQ1R Substitution Conclusion From the perspective of core performance, memory, package, and key peripherals (such as ADC and communication interfaces), the SPC5643LFF2MLQ1R can serve as a functional replacement for the SPC56EL60L5CBFQY, but it is not a direct, risk-free pin-compatible substitute. The critical differences are as follows: First, the core has changed from e200z4d to e200z4. While architecturally related, there may be subtle differences in the instruction set and interrupt controller. Existing firmware will require recompilation and testing, with no guarantee of binary compatibility. Second, the supply voltage range has been widened from 3V–3.63V to 3V–5.5V. This improves power supply flexibility, but if the original design was optimized for 3.3V operation, its power consumption and performance across the wider voltage range must be evaluated. Third, the NXP part adds FlexRay communication support. However, it does not explicitly list LVD (Low-Voltage Detection) and SCI (which may be integrated into the UART), features present in the original part. If the application relies on LVD or specific SCI functionality, the datasheet must be carefully reviewed or external circuitry designed. Fourth, the original part is explicitly marked as AEC-Q100 automotive-grade qualified. Although the replacement part belongs to an automotive series, the certification status of this specific part number must be verified separately. Substitution is feasible but requires rigorous hardware compatibility checks, complete firmware porting, and system-level validation.