Electro Static Discharge

                       Electro Static Discharge



What is ESD ?
   Electrostatic discharge (ESD) is the sudden flow of electricity between two electrically charged objects caused by contact, an electrical short, or dielectric breakdown

Static Energy

Definition:

• Electrostatic discharge (ESD)
• Electrostatic discharge sensitive device (ESDS)
• ESD protected area (EPA)

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  EPA

  
  

  

  ESD

  
  
  

  

  ESDS

ESD protective material:

Conductive:
Materials with an electrical resistance between 1kΩ and 1MΩ

Dissipative:

Materials with an electrical resistance between 1MΩ and 1TΩ

Type of ESD classification:

• Human Body Model (HBM)
• Machine Model (MM)
• Charge Device Model (CDM)

Human Body Model:

The model is a simulation of the discharge which might occur when a human touches an electronic device,.

 

Machine Model:

Also known as the 0-Ω model, MM is designed to simulate a machine discharging through a device to ground.

Machine Grounding

Moving Trolley

Charge Device Model:

The charged-device model (CDM) is a model for characterizing the susceptibility of an electronic device to damage from electrostatic discharge (ESD). The model is an alternative to the human-body model (HBM).

ESD Tray

Tweezer

    ESD Cover & ESD Mad

Static Safe Work Bench:

All ESD device are  grounded through a 1 Meg-ohm resistor.

ESD Failure:

• Catastrophic failure
• Latent defect

Catastrophic failure :

• A catastrophic failure is an immediate failure
• Un Seen Damage making Lost Production
• Additional Manufacturing Cost

Latent defect:

• component partially damaged and weakened
• approx. 90% of damaged ESD-devices
• most expensive; multiplicative effect

Dielectric Breakdown:

predominant in MOS devices

Thermal Breakdown:

• bonding materials melt
• occurs even on low voltages

Energy Density: