esd testing (electrostatic discharge)

**ESD Testing (Electrostatic Discharge)** is a **suite of standardized tests that evaluate a semiconductor device's robustness** — against the high-voltage, short-duration electrical pulses that occur when a charged object (human, machine, or the device itself) discharges through the IC pins. **What Is ESD Testing?** - **Models**: Each simulates a different real-world discharge scenario: - **HBM** (Human Body Model): Person touching a pin. - **CDM** (Charged Device Model): The chip itself is charged, then contacts ground. - **MM** (Machine Model): Metallic machine contacts a charged device (legacy). - **Pass/Fail**: Device must survive the specified ESD pulse voltage without parametric shift or failure. **Why It Matters** - **Manufacturing Survival**: ESD events occur constantly during handling, assembly, and PCB mounting. - **Classification**: Devices are rated (e.g., Class 2 HBM = 2-4 kV) per ANSI/ESDA/JEDEC JS-001. - **Design Requirement**: ESD protection circuits (clamp diodes, SCRs) must be designed into every pin. **ESD Testing** is **the lightning strike survival test** — ensuring chips can withstand the electrostatic shocks encountered throughout their manufacturing and operational life.