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[SOLVED] ESD - what is the meaning?

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lujunfeng111

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ESD

i am a beginner in electronics design, i want to know what is the meaning of ESD? Maybe it is
electronic system design?
 

ME

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lujunfeng111 said:
i am a beginner in electronics design, i want to know what is the meaning of ESD? Maybe it is
electronic system design?
No, ESD means Electro Static Discharge.

ESD can damage semiconductours.
 

xyz5200

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Good articals !

/Warning #7 - No "Good book" messages here! (klug)/
 

cherrycen

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why ESD can damage semiconductours?
 

hot_chmock

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Re: ESD book

If you are hit by lightning ..... you think you will survive?
8O
The same with semicondors, they are very sensitive to ESD, to avoid static elektricity increase the humidity, ground all objects including yourself.
Use hand straps or shoe straps or special shoes for this purpose.
:)

hc
 

Mr.Cool

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Re: ESD book

remember during the winter time when you used to (or still do!) rub your socks along the carpet and then touch your younger sister on the face? zzzzzZZAP! a static electricity discharge.

the discharge is high enough potential to actually arc, you can even see it if the lights are out. this is very high potential, though only momentary period.

such a high potential ZAP can exceed the input/output voltage rating of an integrated circuit chip. this is also the reason why you receive ICs or CPUs, or RAM in those silvery baggies. those bags are specially designed to keep from building electro-static charge. by the way, if people staple these bags closed they effectively remove any usefulness the bag may provide. (i had computer people put 512Megs of RAM into a bag then staple it shut!!).

also, you might have seen those wrist straps that people wear when working with ICs. maybe they are soldering a board, or picking up devices for a closer look. the wrist strap is attached from your wrist (duh..) to ground so that any electro-static charge that might have built up on your body will discharge safely to ground, instead of into the device! by the way, when your are protyping a circuit board and you are wearing a wrist strap, be SURE to remove the strap when you turn the power ON in the board you are working on!! you do NOT want to be an easy path to ground when there is a power source applied!!!

Mr.Cool
 

883

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ESD

You can refer to :
MIL-STD-883 TM3015
BELLCORE 000870
IEC61000-4-2 etc
and also on the website

The ESD Moudle is usurally include : HBM, CDM, MM etc
 

chengjie1982

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Re: ESD

if you touch the input and output pin of one chip simultaneously, you may provide a static discharge path which can destroy your circuit.

most ic always has a way to protect against it.

you can find detail information in the book Ic mask design.
 

pisoiu

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Re: ESD

Let's offer some numbers guys. An ESD can produce a pulse of 300A, voltage up to 20KV for a duration of few nanoseconds. This pulse can disrupt a electronic device or even destroy it. This kind of energy will always search the shortest path to the ground. Unfortunaytelly, for such high currents, even a strong wire, copper trace or metal case has enough inductance in order to stop the instanteniously surge of ESD potential to ground. Thus, in the point where ESD is discharged the potential is extremely high for a short period of time. This ammount of current will produce a EMP (electromagnetic pulse). If the PCB inside your device is poorly designed and contain loops, these loops will act as antennas for the EMP and inside that loop a electric voltage will be induced. If the loop is close and large enough, the induced pulse will destroy sensitive components. If you are lucky, only false triggering, circuits reset and volatile memory alteration will apear. If electronic components are directly in the path of the point where ESD is produced and ground (ex. you discharge directly into a IC pin), then start praying. There are few components which are protected against ESD discharge and will protect the circuits around(ex. some RS232 interfaces) but these will be effective only if they are properly connected to ground. Detailed informations about what is ESD, and how can be avoided effects of ESD are available in books related to subject like : PCB signal integrity, EMI/EMC/ESD design for compliance, etc. Search e-books upload/download.

/pisoiu
 

spauls

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Re: ESD

Everyone has experienced static discharge at one time or another. A simple example would be when you walk across a carpeted floor and reach for the door handle. That spark and noise accompanied by an uncomfortable sting in the tips of your fingers is the discharge of static electricity. Your body actually built up an electrical charge of thousands of volts that discharged when your fingers got close to the door handle.
Electrostatic charges can be stored in many things; for example, man-made fibre clothing, moving machinery, objects with air blowing across them, plastic storage bins, sheets of paper stored in plastic envelopes, paper from electrostatic copying machines, and people (see Figure).

Electrostatic discharge (ESD) is the transfer of an electrostatic charge between bodies at different potentials and occurs with direct contact or when induced by an electrostatic field.
 

hskao

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ESD

Right now, we often add varistors to avoid ESD discharge. It is 0402 size.
 

mario1980

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Re: ESD

ESD - Electro-Static Discharge efects can degrade the performances of circuits and even total and permanent damege. The phenomenon manifests itself as the "melting" of silicon or wires that are in the path of such a discharge. Care must be taken in designing both the width of the wires and the devices.
 

a_aziz

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ESD

Hi.
ESD is Electro Static Discharge.
this phenomena may be damage electrical and
electronic's systems.
lightning is an example of this phenomena.
thancks.
 

mmohsen

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Re: ESD

ESD is a high-voltage transient with fast rise time and fast decay time. Several thousand volts of ESD with a high rise time (dv/dt) could break through the junction layer of protective devices easily and cause damage. ESD surge energy, however, is very small, and it does not require much energy-handling capability from a protective device.

here are some digrams showing ESD protection

ESD Protection Devices:

-Traditional methods of shunting ESD energy to protect ICs involves devices such as
- zener diodes,
- metal oxide varistors (MOVs),
- transient voltage suppression (TVS) diodes, clamp diodes.
 

sanJerry2004

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ESD

Remember when two medium connected, Plus /plug, we should consider ESD. In design, we should avoid or give more attention to the protection. Usually, we treat it as transistant pulse.
 

hakeen

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Re: ESD

Well

ESD: Electro Staticy Discharge

Electronic devices are classified acc to ESD classes. More info at:

http://www.esdsystems.com/whitepapers/wp_devicesandstatic.asp

To prevent ESD in simple circuits(like amateur ones) connecting a diode in reverse bias is sufficinet. For more complex designs, better solutions required...

Hope it helps.
 

power-twq

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Re: ESD

Hello, it's electrostatic discharge.

it's a spark.

best regards




lujunfeng111 said:
i am a beginner in electronics design, i want to know what is the meaning of ESD? Maybe it is
electronic system design?
 

manasiri

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Re: ESD

Dear sir,

ESD is one of main EMC topics.
the uploaded ppt file is good introduction to ESD.

If you want more detailes and files , contact us.
Regards ,
An EMC engineer,
 

vlsiattitude

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Re: ESD

when u touch an IC charge flows from ur body to gate of the transistor.it produces voltage now since the gate oide is very thin this voltage can generate high electric fields which can damage gate oxide .
 

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