1663590-1 is a backup plate insert designed for socket connector applications. This component is manufactured by TE Connectivity and features a C4 configuration with yellow color coding for identification purposes. The product is characterized by low halogen content with Br, Cl, F less than 900 ppm per homogenous material and is BFR/CFR/PVC free. It does not contain REACH SVHC substances. This backup plate is typically used in connector assemblies where secure contact retention and proper alignment are required.