Based on this product's specifications, here are some alternatives and similar models
Power jack with cable extra digital for LENOVO Ideapad Y450 PJ340439
Summary description:
Replacement power jack with cable by extra digital designed for Lenovo Ideapad Y450 (model PJ340439). Provides the DC input connection required to power and charge the laptop. Intended for repair or replacement of a damaged or faulty power inlet assembly; restores reliable power delivery and charging functionality without modifying the device.