The physics of damage caused by esd includes several

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The physics of damage caused by ESD includes several mechanisms: (a) Transfer of static electric charge from the human body or another object to the device, as we described above (note that if the human body is positively charged, then the electrons will actually move to the body from the device). (b) Transfer of charges from the device to the human body or another object: this may occur even when the human body is grounded but the device itself got charged, for example due to its vibration within the package (which includes repeated contact and separation of surfaces). (c) Intense electric fields caused by static charges can induce polarization of charges within the device, which may be damaging even without direct transfer of charges between the device and other objects, etc. We will not go into the details in this text; if you are curious, search the Internet or a good library catalog. Suffice it to say that in the near future the risk of damage due to ESD will increase, because the current trend is to pack more circuitry onto miniature electronic devices means that their insulating layers would become thinner and more vulnerable to ESD. Book Page 132
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EE for 21 st century 1-3 Prevent electrostatic discharge 1-3-1 Hazards of ESD for EE © 2015 Alexander Ganago Page 10 of 23 Last printed 2015-07-24 6:00 PM File: 2015 1-3-1 ESD.docx Remember: Ø ESD impacts productivity and product reliability in every aspect of today’s electronics environment, including applications of electronics to non-EE engineering fields Ø Many aspects of electrostatic control in the electronics industry also apply in other industries such as nanotechnology, clean room applications, graphic arts, etc. Ø Industry experts have estimated the actual cost of ESD damage to the electronics industry as running into the billions of dollars annually. We need to avoid the damage to ESD-sensitive devices. Evidently, the two main strategies are: I. Prevent accumulation of static electric charges at the workplace. II. Remove from the workplace the static electric charges, which are already accumulated there. We have already learned about effective ways for reducing the risk of electrostatic discharge. From the data in Figure 3, we know: wear cotton instead of synthetic fibers – and your body will accumulate less static electricity. Figure 4 tells us to keep the air humidity relatively high in order to reduce voltages generated by static charges. But these are only partial measures, because – even in the humid air – static electric charges can accumulate and generate the voltages well above the level, which is safe for electronic devices. Now we need to learn how to remove static electric charges from the human body and various objects at the workplace; the specific strategies depend on the types of materials, which we consider in the next section.
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  • Fall '07
  • Ganago
  • Electric charge, Alexander Ganago

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