Teledyne Tablet Accessory T803 Manual De Usuario
A Primer on Electro-Static Discharge
Teledyne API T803 CO2/O2 Analyzer Operation Manual
226
Walking across nylon carpet
1,500V
35,000V
Walking across vinyl tile
250V
12,000V
Worker at bench
100V
6,000V
Poly bag picked up from bench
1,200V
20,000V
Moving around in a chair padded
with urethane foam
with urethane foam
1,500V 18,000V
13.2. HOW ELECTRO-STATIC CHARGES CAUSE DAMAGE
Damage to components occurs when these static charges come into contact with
an electronic device. Current flows as the charge moves along the conductive
circuitry of the device and the typically very high voltage levels of the charge
overheat the delicate traces of the integrated circuits, melting them or even
vaporizing parts of them. When examined by microscope the damage caused by
electro-static discharge looks a lot like tiny bomb craters littered across the
landscape of the component’s circuitry.
an electronic device. Current flows as the charge moves along the conductive
circuitry of the device and the typically very high voltage levels of the charge
overheat the delicate traces of the integrated circuits, melting them or even
vaporizing parts of them. When examined by microscope the damage caused by
electro-static discharge looks a lot like tiny bomb craters littered across the
landscape of the component’s circuitry.
A quick comparison of the values in Table 13-1 with the those shown in Table
13-2, listing device susceptibility levels, shows why Semiconductor Reliability
News estimates that approximately 60% of device failures are the result of
damage due to electro-static discharge.
13-2, listing device susceptibility levels, shows why Semiconductor Reliability
News estimates that approximately 60% of device failures are the result of
damage due to electro-static discharge.
Table 13-2: Sensitivity of Electronic Devices to Damage by ESD
DAMAGE SUSCEPTIBILITY VOLTAGE
RANGE
DEVICE
DAMAGE BEGINS
OCCURRING AT
CATASTROPHIC
DAMAGE AT
MOSFET
10 100
VMOS
30 1800
NMOS
60 100
GaAsFET
60 2000
EPROM
100 100
JFET
140 7000
SAW
150 500
Op-AMP
190 2500
CMOS
200 3000
Schottky Diodes
300
2500
Film Resistors
300
3000
This Film Resistors
300
7000
ECL
500 500
SCR
500 1000
Schottky TTL
500
2500
Potentially damaging electro-static discharges can occur:
Any time a charged surface (including the human body) discharges to a device.
Even simple contact of a finger to the leads of a sensitive device or assembly can
allow enough discharge to cause damage. A similar discharge can occur from a
charged conductive object, such as a metallic tool or fixture.
Even simple contact of a finger to the leads of a sensitive device or assembly can
allow enough discharge to cause damage. A similar discharge can occur from a
charged conductive object, such as a metallic tool or fixture.
07276B DCN6418