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MODULE 01

Introduction & What Is ESD

Electrostatic discharge (ESD) is the sudden transfer of electrostatic charge between two objects at different electrical potentials. The event may last only a few nanoseconds, yet peak currents can exceed 30–60 A — enough to cause permanent damage, temporary malfunction, or a latent reliability failure that doesn't show up until months later in the field.

Learning Objectives

By the end of this module you should be able to:

⚡
Understand electrostatic discharge
🧲
Learn how charge accumulates
📈
Recognize the shape of an ESD current waveform
🛡
See where ESD protection fits in the design chain
🔬
Recognize the physical chain from spark to failure

ESD is invisible until it isn't. A person walking across carpet in dry air can build up a body voltage of several kilovolts without feeling a thing, right up until a fingertip gets close enough to a grounded conductor for the air itself to break down and a visible (or audible) spark jumps the gap.

A blue spark jumping from a fingertip to the metal can of a transistor
The real thing: a spark bridges the air gap between a charged fingertip and the metal can of a transistor. The whole event is over in nanoseconds — but the peak current can reach tens of amperes.

Inside a product, that same spark becomes a nanosecond-scale current pulse injected directly into a connector, a case seam, or an exposed trace — fast enough that a poorly protected IC pin sees the full transient before any downstream circuitry has a chance to react.

Animated: From Charged Person to IC Failure

Watch the charge build on the person, transfer through the spark, and propagate into the product as a fast current pulse.

Not every ESD event destroys a part outright. A "soft" failure — a reset, a frozen display, a dropped USB connection — can be just as costly in the field as hard component damage, and IEC 61000-4-2 test criteria explicitly cover both outcomes.

Click through each stage below to see exactly how a routine walk across a room becomes an electrical event a product has to survive.

Animated: The Stage Currently Selected

Animated: How Charge Builds in the Human Body — and Kills a Component

Watch the full sequence on repeat: every footstep on the carpet transfers a little charge (triboelectric charging), body voltage climbs into the kilovolt range, and the moment a fingertip gets close enough to an IC pin the entire accumulated charge dumps through the chip in nanoseconds — puncturing the gate oxide.

Interactive: A Real-Style ESD Contact-Discharge Current Waveform

The IEC 61000-4-2 8 kV contact-discharge current waveform: a sub-nanosecond rise to a sharp first peak near 30 A, followed by a slower secondary hump out to tens of nanoseconds. Hover to read exact values; this exact shape is what Module 05 breaks down in full detail.

KNOWLEDGE CHECK

Module 1 Quiz

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