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An appropriate waveform model

The most obvious issue relates to the actual assembly stage, where the device is inserted by hand, and then clinched to retain it in position. The Human Body Model is appropriate here, because this relates to the charge built up on the operator, and potentially discharged through the device.

Less obvious, and potentially more dangerous, given that the operator will be taking antistatic precautions, is the tube packaging for the component. Parts are generally tipped out of tubes, and may generate a static charge during this process, because the bodies rub against the inside of the tube. For that reason, parts should always be directed into a static-safe container, or onto a dissipative work-top, as otherwise the discharge may cause damage. For this source of static, you would use the Charged Device Model in assessing the part for ESD sensitivity. [You should also specify appropriate materials and surface coatings for the tube, to minimise charge generation]

Now return to Search 4 in ESD awareness, and explore this before proceeding to the next section.

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