Electro Static Discharge Sensitive (ESDS)

ESD HANDLING AND PROTECTION

SOURCES OF ELECTROSTATIC DISCHARGE

The physical contact and separation of two materials most commonly cause electrostatic charge. This physical contact can be rubbing, sliding, banging or other similar, intimate contact interaction. The contact and separation process transfers negatively charged surface electrons from one material to the other thereby creating a negative charge on one surface and a positive charge on the other. This is called triboelectric charging and can occur virtually with any type of material. This list shows some of the most common materials in the triboelectric series and their tendency towards charged polarization.
 

 ESD is the transfer of electrostatic charge from one material to another. This occurs when the two materials are of unequal charge levels. The most common cause of electrostatic damage is the transfer of charge from the human body or a charged material directly to the ESDS device.

Electrostatic Discharge Precautions
Electrostatic discharge (ESD) can destroy or damage many electronic components, including integrated circuits and discrete semiconductor devices. Since certain devices are most susceptible to ESD damage than others, warning symbols are now used to identify ESD sensitive (ESDS) items.

ESDS SAFETY PROCEDURES
In order to protect the ESD sensitive devices, any accumulated charge on the body of the human operator should be discharged first before opening the protective container with ESDS devices inside.
The common material used is the wrist-strap. The discharge can be accomplished by putting a hand on a grounded surface or, ideally, by wearing a grounded antistatic wrist-strap. The packing material for ESDS is out static plastic bags as you can see on these examples.

 

 Electrostatic charges:

• Are generated when surfaces of different materials come into contact
• Are stored on the surfaces of physical objects; the human body is included.

ESD from nylon or human hair onto polyethylene or steel can cause these types of damage to unprotected electrostatic discharge sensitive devices:

• Changes in basic characteristics
• Degradation of performance
• Catastrophic failures

WARNING: USE ONLY WRIST STRAPS THAT HAVE A GROUND LEAD RESISTANCE OF 250,000 OHMS MINIMUM TO 1.5 MEGOHMS MAXIMUM. CONTACT BETWEEN A LOW RESISTANCE WRIST STRAP AND A HIGH VOLTAGE IS A SHOCK HAZARD AND WILL CAUSE INJURY TO THE PERSON.
CAUTION: DO NOT TO TOUCH THE ELECTRICAL PINS. DAMAGE CAN OCCUR TO THE INTERNAL ESDS COMPONENTS .