Protection of electronic components against electrostatic phenomena

ESD-norm IEC (DIN EN) 61340-5-1

What is contained within the ESD-norm?

In the public norms and guidelines standards, limits and test methodes for ESD-protection are defined.

 The ESD-norm IEC (DIN EN) 61340-5-1 states the necessary administrative and technical requirements (creation, introduction and preservation) of a control program against electrostatic discharge (ESD). 

These are critical for the creation on a ESD-control program plan and the creation of a ESD-protected area (EPA - electrostatic protected area).

Norm coform ESD-protection is the technical standard and any company, which produces or handles electronic components, is required to adibe by as part of quality assurance.

Other countries - other names, but the same rules!

 

  1.  ESD-norm IEC (DIN EN) 6340-5-1 with subsections
    Electrostatic– Part 5-1: Protection of electronic components against electrostatic phenomena - general requirements.

    Regional application: Worldwide, especially in Europe, Asia, Russia and the Middle East.
     
  2.  ANSI/ESD S20.20-2007- with subsections
    ESD Association Standard for the Development of an Electrostatic Discharge Control Program. Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Exposive Devices).

    Regional application: Worldwide, predominantly in North America.

The physical considerations of  both rule sets are the same  and the limits were harmonized under IEC 61340-5-1:2016.

 

Overview of important ESD-norms and subsections

 

DIN EN 61340-5-1
Electrostatic– Part 5-1: Protection of electronic components against electrostatic phenomena – general requirements.

DIN EN 61340-5-1 Beiblatt 1
Electrostatic – Part 5-2: Protection of electronic components against electrostatic phenomena – user hand book.

DIN EN 61340-5-3
Electrostatic – Part 5-3: Protection of electronic components against electrostatic phenomena – Characteristics and requirements for the classification of packaging, which is used for components, which are sensitive to electrostatic discharges.

DIN IEC/TR 61340-5-5
Electrostatic - Part 5-5: Packaging systems in electronic manufacturing

DIN EN 61340-4-1
Electrostatic - Part 4-1: Standard-testing methodes for special applications (electrical resistance of floor coverings and laid floors).

DIN EN 61340-4-2
Electrostatic - Part 4-2: Standard-testing methodes for special applications – methode to define electrostatic characteristics of textiles.

DIN EN 61340-4-3
Electrostatic – Part 4-3: Standard-testing methodes for special applications (shoes).

DIN EN 61340-4-4
Electrostatic – Part 4-4: Standard-testing methodes for special applications – classification of flexible containers in electrostatic regard.

DIN EN 61340-4-5
Electrostatic – Part 4-5: Standard-testing methodes for special applications (methode of characterization of electrostatic protection of shoes and floors in combination with a person).

DIN EN 61340-4-6
Electrostatic – Part 4-6: Standard-testing methodes for special applications – wrist strap.

DIN EN 61340-4-7
Electrostatic – Part 4-7: Standard-testing methodes for special applications – ionization.

DIN EN 61340-4-8
Electrostatic – Part 4-8: Standard-testing methodes for special applications – shielding against electrostatic discharge – bags.

DIN EN 61340-4-9
Electrostatic – Part 4-9: Standard-testing methodes for special applications – clothing.

DIN EN 61340-2-1
Electrostatic – Part 2-1: Test methodes, ability of materials and parts to dissipate electrostatic charges.

DIN EN 61340-2-3
Electrostatic – Part 2-3: Test methodes to determine the resistance and the specific resistances of soild, level material, which are used to avoid the creation electrostatic charges.

DIN EN 61340-3-1
Electrostatic – Part 3-1: Methode to simulate electrostatic effects – test puls forms of electrostatic discharge for the Human Body Model (HBM).

DIN EN 61340-3-2
Electrostatic – Part 3-2: Methode to simulate electrostatic effects – test puls forms of electrostatic discharge for the Machine Model (MM).

ANSI/ESD S20.20-2007- with subsections
ESD Association Standard for the Development of an Electrostatic Discharge Control Program. Protection of Electrical and Electronic Parts, Assemblies and Equipment (Excluding Electrically Initiated Exposive Devices).

 

ESD-lexicon: ESD-knowledge from A - Z

 

CDM (Charged Device Model)

Discharge of a through influence charged component.
Detailled description of the CDM in norm ANSI /ESD STM 5.3.

 

Conductive 

Electrostatic conductive = R < 10KΩ

 

Dissipative 

Electrostatic dissipative = R 10 KΩ < 100GΩ

 

EBP

Earth Bonding Point is the marked connection for all ESD grounding; not to be used as a protective ground wire.

 

EPA

The Electrostatic Protected Area is an area that is equipped with all ESD-protective precautions, in which ESDS can be produced, handled, packed and transported or stored without danger.

 

ESD

Electrostatic Discharge, is the electrostatic discharge that happens between a charged body through direct contact or arcing as potential equalisation.

 

ESD-models

With idealized model settings the goal is to recreate real ESD-discharges and the test methodes to define the sensitivity of components. The most used models are HBM, CDM and MM.

  • HBM (Human Body Model)
    Discharge of a charged human onto a component.
    Detailled description in norm DIN EN 61340-3-1 /ESD STM 5.1
     
  •  MM  (Machine Model)
    Discharge of a charged, isolated conductor onto a component.
    Detailled description in norm DIN EN 61340-3-2 /ESD STM
     
  • CDM (Charged Device Model)
    Discharge through influence onto a component.
    Detailled description in norm ANSI /ESD STM 5.3

 

ESDS (Electrostatic Discharge Sensitive Device)

Description for components and groups which can be damaged by electrostatic discharge though handling, producing or transport.

 

Electrostatic charge

Electrostatic charges happen thogh friction or devision of materials, also called "tribo electricity". The power and polarity of the charge is dependend on the material and the surrounding humidity.

 

HBM (Human Body Model)

Discharge a charged human onto a component.
Detailled description in norm DIN EN 61340-3-1 /ESD STM 5.1

 

Ionization

Through the corona-effect under high voltage created positive and negative ions neutralize electrostatic charges. Use: mainly to discharge non-conductors.

 

Isolator

Materials are isolating if their surface resistance is higher than 1011 ohm.

 

MM (Machine Model)

Discharge of a charged, isolated conductor onto a component.
Detailled description in norm DIN EN 61340-3-2 /ESD STM 5.2

 

Resistance measurements

Measuring methode to measure resistance (ESD):

Material testing:

  •  Surface resistane (Rs) 
    Resistance of the material surface

     
  • Point-to-point resistance (Rp-p)
    Resistance between point-to-point of the material surface
     
  • Volume resistance (Rv)
    Resistance through the measured material
     

Fuction of the test:

  • Leak resistor(Rg)
    Resistance of a point to system ground