Читать книгу The ESD Control Program Handbook - Jeremy M. Smallwood - Страница 81
2.10 How to Avoid ESD Damage of Components 2.10.1 The Circumstances Leading to ESD Damage of a Component
ОглавлениеESD damage does not occur unless there is ESD. The circumstances leading to ESD are as follows:
A conductor attains a high voltage through induction or triboelectrification. The conductor may be○ A person○ A metal or other conductive item such as a tool, machine part, or cable○ An ESDS component
The conductor touches, or comes sufficiently near to another conductor or ESDS device, for ESD to occur.
The ESD current passes through a part of the ESDS device that may be damaged by ESD.
The discharge current, charge, energy, or voltages developed on the ESDS device must exceed a threshold at which damage is likely to occur.
Most ESDS devices are not directly damaged by exposure to electrostatic fields. The risk is usually due to induced voltages on the device or a nearby conductor causing ESD when the ESDS device touches the conductor. For some high‐impedance, voltage‐sensitive devices, induced voltages can cause a risk of breakdown within the device.
