Teledyne API Ultrafine Particle Monitor - Model 651

 

 

Primer on Electro-Static Discharge

Table10-2 Sensitivity of Electronic Devices to Damage by ESD

 

DEVICE

 

DAMAGE SUSCEPTIBILITY VOLTAGE RANGE

 

 

 

DAMAGE BEGINS

 

CATASTROPHIC DAMAGE AT

 

 

 

 

OCCURRING 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.

When static charges accumulated on a sensitive device discharges from the device to another surface such as packaging materials, work surfaces, machine surfaces or other device. In some cases, charged device discharges can be the most destructive.

A typical example of this is the simple act of installing an electronic assembly into the connector or wiring harness of the equipment in which it is to function. If the assembly is carrying a static charge, as it is connected to ground a discharge will occur.

Whenever a sensitive device is moved into the field of an existing electro-static field, a charge may be induced on the device in effect discharging the field onto the device. If the device is then momentarily grounded while within the electrostatic field or removed from the region of the electrostatic field and grounded somewhere else, a second discharge will occur as the charge is transferred from the device to ground.

07506C DCN6727

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Teledyne 651 operation manual Sensitivity of Electronic Devices to Damage by ESD