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The ESD5V0D9H is a miniature ESD protection diode designed for space-critical electronic systems requiring fast transient suppression and stable long-term reliability. Featuring a 5V reverse working voltage, breakdown around 6.2V, and clamping voltage approximately 12.3V under surge conditions, it efficiently protects sensitive components against electrostatic discharge events up to ±30kV. With controlled junction capacitance and robust thermal performance, it is well suited for notebook interfaces, SIM ports, power rails, and compact digital devices.