The 2007 version of the ANSI/ESD S20.20 has been updated. The ESDA continues to remove guidance from the ANSI/ESD S20.20 and focus the document on the requirements for an ESD Control Plan. Guidance for how to meet requirements of the ANSI/ESD S20.20 and how to mange the ESD Control Plan is detailed in the ESD Handbook-…
We are regularly asked if paper is OK in the ESD Protected Area or at an ESD workstation. Regular paper is insulative but tends to be low charging because it is hygroscopic (readily absorbs moisture). The primary concern with paper is placing ESD sensitive items on the paper interfering with the path-to-ground of the grounded ESD mat. Best practice…
Published in InCompliance Magazine Written by The ESD Association April 01, 2014 The ESD Association has published the second of a six part article titled Fundamentals of Electrostatic Discharge in the April edition of InCompliance. Part two covers the following topics: Basic Principles of Static Control Design In Protection Define the Level of Control Needed…
Ionization is probably the most misunderstood and under used technology for controlling ESD. There are some cases where ionization would be primary method of controlling ESD in an ESD Protected Area and there are others where it would not even be necessary. The need for ionization largely depends on what and how ESD susceptible devices…
Relative humidity (RH) directly affects the ability of a surface to store an electrostatic charge. As RH increase, the time a surface will hold a charge will decrease and the dissipation rate will increase. As the RH increases, so does the natural conductivity of the air, but even at 100% RH the increase in the…
ANSI/ESD S20.20 has three garment categories with the following names and required limits: Category 1 – Static Control Garment < 1 x 1011 ohms Category 2 – Groundable Static Control Garment < 1 x 109 ohms Category 3 – Groundable Static Control Garment System < 3.5 x 107 ohms The primary purpose of a smock…
Surface Resistance Test Kit OTHER CONSIDERATIONS Discipline A significant increase in the discipline of implementing the fundamentals of ESD control noted in ANSI/ESD S20.20 Foreword, calls for: Ground all conductors in the EPA including people Remove all insulators from the EPA or use ionizers for process necessary insulators Package ESD sensitive items going outside the…
Antistatic is the ESD control property properly referred to as “low charging”. This is an important property for all bags used inside or outside of an ESD protected area (EPA). Specifically, it is important that the inside of the bag be low charging, so when the ESD Sensitive Device is inserted into the bag or…
Read more What is the exact difference between antistatic bags and dissipative bags?
HUMAN BODY MODEL The updated standard ANSI/ESDA/JEDEC JS-001-2011, For Electrostatic Discharge Sensitivity Testing Human Body Model (HBM) – Component Level Table 3 has divided the Class 0 classification into two withstand voltage levels with class 0A being less than 125 volt sensitivity, and class 0B being 125 to less than 250 volts. If handling class…
A Faraday cage or Faraday shield is an enclosure formed by conducting material or by a mesh of such material. Such an enclosure blocks external static and non-static electric fields. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836. An impressive demonstration of the Faraday cage effect is that…