Engineering Definitions
"A" "B" "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

Electrostatic Discharge. ESD

'A' to 'D', 'El', 'Es', 'H', 'M', 'S'

Antistatic Material. A material having a surface resisitivity between 109 and 1014 ohms per square.

Antistatic Property. the reduction of triboelectrlc charge generation. Anti-static materials minimize the generation of static charges. This property is not dependent upon material resistivity.

Catastrophic Failure. A failure resulting in the permanent loss of a critical function.

Charged Device Model. [CDM] A model characterizing a particular ESD failure mechanism in which an item isolated from ground is charged and is subsequently discharged causing a short duration discharge pulse. One of three ESD models, refer to the chart below. The standard that defines CDM is; ESD STM5.3.1: Electrostatic Discharge Sensitivity Testing - Charged Device Model.

Classification of ESDS Parts.
ESD Class 1: Susceptible to damage from ESD voltages greater than O to 1,999 Volts.
ESD Class 2: Susceptible to damage from ESD voltages of 2,000 to 3,999 volts.
ESD Class 3: Susceptible to damage from ESD voltages of 4,000 to 15,999 volts.
ESD Class non-ESD Sensitive: Susceptible to damage from ESD voltages above 16,000 volts.

Note there are sub classifications, refer below right.

HBM; Human Body Model, HBM Definition
MM; Machine Model,
CDM; Charged Device Model

Table of ESDS Sub-Classes
ESDS Models and Voltage Ranges

Junction polarities for ESD conditions test
Device Type Junction/Polarity
Bipolar transistor (NPN) E+ to B
Bipolar transistor (PNP) E- to B+
Junction FET's (N-channel) G+ to S
Junction FET's (P-channel) G- to S+
MOSFET's (N- or P-channel) G to S (both polarities)
Gate protected FET's (P-channel) G to S (both polarities)
Rectifiers (hot carrier and schottky) A- to K+
Thyristors G to K (both polarities)
Unijunctions G to B1 (both polarities)
Darlingtons E to B (both polarities)
Small signal diodes A to K (both polarities)

Conductive Material. A material having a maximum surface resisitivity of 105 ohms per square.

PC motherboard

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