1. QAS254K600D047 Substitution Conclusion The QAS254K600D047 is mechanically and electrically compatible with the original QAS254K600D022, as both share a 600V rating, identical radial package, and dimensions. The difference lies in the resistance value, which increases from 22Ω to 47Ω, while the capacitance remains unchanged at 0.25µF. This change reduces the cutoff frequency of the RC snubber network from approximately 28.9kHz to 13.6kHz. As a result, the new part provides enhanced attenuation of low-frequency noise but may offer reduced suppression of high-frequency interference. The higher resistance also increases damping and power dissipation, which could affect thermal performance and transient response in the application. Substitution feasibility depends on the specific circuit's filtering requirements. If the original design allows for the shift in cutoff frequency and can tolerate slightly higher resistive losses, the substitution is acceptable. However, if the application has strict constraints on frequency response or power dissipation, direct substitution is not recommended, and further evaluation or testing should be conducted.