The 1.5KE200A from STMicroelectronics is a TVS diode used to help protect sensitive electronics from transient voltage events such as surge pulses, ESD-related disturbances, and other overvoltage conditions that can damage downstream circuitry. Components in this category are commonly designed into power rails, industrial interfaces, telecom lines, automotive-adjacent electronics, and general embedded systems where surge robustness is important. For engineers, this part is positioned as a practical protection component for improving field reliability and reducing the risk of costly failures caused by short-duration electrical stress. It may be considered in both new and maintenance-oriented designs where a through-hole TVS solution is acceptable. Lifecycle status for 1.5KE200A is currently information not available, so supply planning should include distributor cross-checks and manufacturer confirmation before committing to volume production. RoHS compliance information is also not available in the provided data and should be verified through the official datasheet, STMicroelectronics documentation, or authorized channel compliance records.