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

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 93