ESD wrist strap usage: who or what is primarily being protected when a technician wears an antistatic wrist strap?

Introduction / Context:
Electrostatic discharge (ESD) can silently damage semiconductor devices long before failure becomes obvious. Wrist straps are a staple of ESD control programs in electronics assembly and repair. Understanding their purpose is crucial for safe handling of sensitive components.

Given Data / Assumptions:

• An antistatic wrist strap connects the technician to a common ground via a high-value resistor (often 1 MΩ).
• Work takes place on an ESD-safe mat and grounded workbench.
• Components affected include memory modules, CPUs, chipsets, and add-in cards.

Concept / Approach:
The strap equalizes electrical potential between the technician and the equipment, preventing charge buildup and sudden discharge through the device. This protects the components. It is not personal protective equipment for shock hazards; the series resistor limits current for safety, but the primary purpose is not to protect the person—rather, to protect the electronics.

Step-by-Step Solution:

Verification / Alternative check:
Use an ESD tester to verify strap effectiveness. Repeated field failures drop dramatically when straps are used correctly, indicating the protection is focused on components.

Why Other Options Are Wrong:

• Service Technicians: The strap is not designed to protect humans from mains shock; it is for component safety.
• Both: Overstates the strap’s scope—its primary protection target is the hardware.

Common Pitfalls:
Failing to check the strap's ground path, connecting to painted metal (no ground), or assuming the strap replaces other ESD controls like anti-static bags and mats.

Final Answer:
PC Components