Antistatik uygulamalar

Antistatik (ESD) Uygulamalar

We encounter static electricity events every day. Walking on a carpeted floor, especially in winter, creates static electricity, sometimes up to sparks, when we come into contact with a metal surface. While this static electricity discharge is not harmful to humans, it can cause great damage to ESD (electrostatic discharge) sensitive electronic devices. Humidity has a great effect on the formation of electrostatic voltage. In cases where the humidity is low (eg 20%) the electrostatic formation is 50-100 times higher than when the humidity value is >60%.

Under most conditions, it must be around 3500 Volts for us to feel an electrostatic discharge, 4000 V for a spark to appear in a dark room, 10,000 Volts for a spark to appear in a lighted room, and 5000 V for a crackling sound to be heard. Electronic components and assemblies can be damaged well below these values. Modern electronic circuits occupy more and more space in our lives, and circuit sizes are getting smaller with this number. This means that the current and voltage from electrostatic discharge, which can affect devices, are very low values. Since these circuits need to be operated faster, the protective elements used in the past and limiting the operating speed by creating additional capacitance are no longer used.

Another point to note is that damage from ESD does not render the device unusable directly. Up to 10-20% of devices damaged by ESD become inoperable directly. The other type of damage is called covert damage, and although the device appears to be working normally at first, it results in poor performance, eventually rendering it unusable.

Electrical classification of materials according to their surface resistance

Conductive material surface resistivity 10³ – 10⁶ ohms/square

Static dissipating material surface resistances >1×10⁶ ohms/square < 1×10¹² ohms/square

Antistatic material surface resistances 1×10⁹ ohms/square – 1×10¹² ohms/square

Yalıtkan malzeme yüzey dirençleri > 1×10¹² ohms/square

Surface resistivity of ideal ESD protected materials 10⁶ ohms/square – 10⁹ ohms/square

(For more detailed information, see Information Center)