ESD (Electrostatic Discharge) check is a critical quality assurance process in semiconductor manufacturing, designed to identify and mitigate vulnerabilities in integrated circuits (ICs) to electrostatic discharge events. During production, even minor static electricity can damage delicate semiconductor components, leading to latent defects or immediate failure. Manufacturers implement rigorous ESD checks at multiple stages—from wafer fabrication to packaging—using specialized testing equipment like Human Body Model (HBM) and Charged Device Model (CDM) simulators. These tests verify the effectiveness of on-chip ESD protection structures, such as diodes and clamps, ensuring compliance with industry standards like JEDEC. Robust ESD protocols safeguard product reliability, reduce field returns, and maintain yield rates, making them indispensable in high-volume semiconductor production.