1. PL123-05SC Substitution Conclusion From the perspectives of core functionality, electrical parameters, and package, the PL123-05SC can substitute the original part NB2305AI1DR2G. Both are 1:5 zero-delay clock buffers utilizing CMOS single-ended signaling, with identical operating voltage range (3.0V–3.6V) and package (8-SOIC). The PL123-05SC offers a slightly better maximum frequency of 134 MHz compared to the original's 133 MHz. The difference lies in the PLL functionality: the PL123-05SC's PLL supports a bypass mode (Yes with Bypass), a feature not explicitly mentioned in the original part's datasheet. This gives the PL123-05SC an additional clock path option in application, allowing the PLL to be bypassed to reduce power consumption or avoid PLL lock time. If the original design does not utilize this feature, the substitution will result in identical behavior. If this functionality is required, modifications to the configuration circuitry or signaling will be necessary.