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Canada. CAURA West & Western Canadian University Risk & Liability Group Australian Universities Risk Management & Risk Registers Keith Old (BPC Canada). November 19 th 2005. AGENDA. Australian Universities – some facts Australian Universities and Government What is Risk Management?
Transcripts
Slide 1

3 Static Awareness Seminar

Slide 2

Types of ESD Failures to Electronic Devices Catastrophic Failure Device no longer works Represents 10% of ESD disappointments Intermittent/Walking Wounded Device is operational, however inconsistent and will bring about extra administration calls Represents 90% of ESD disappointments

Slide 3

Static Damaged Mos Transistor OXIDE LAYER GATE DRAIN SOURCE

Slide 4

Cost of ESD harm increments by ten (10) overlap at each procedure level Field Service Level System Level Board Level $5000 Component Level $500 $50 $5

Slide 5

Where do you require static assurance ? Approaching assessment and test Stores and capacity Transfer trucks Kitting Manual and robotized insertion Wave welding Equipment gathering and test Packaging and sending Repair stations Field benefit

Slide 6

DEFINITION OF STATIC ELECTRICITY The zap of materials through physical contact and partition, and the different impacts that outcome from the positive and negative charges so shaped. + _

Slide 7

MAJOR PROBLEMS CAUSED BY STATIC Dust and Lint Attraction Material Handling Problems Damage to Products Product Malfunction Fire and Explosion Hazards Shock to Personnel

Slide 8

Ranking of Semiconductor Failure Causes EOS/ESD is the #1 Cause of Semiconductor Failure EOS/ESD 59% Electrical testing 3% Oxide/passivation disappointment 3% Conductor disappointment 3% Die crack 4% Lead short/open 7% Wire bonds 15% Others 6% Source : Semiconductor Reliability News, March 1993

Slide 9

Device Type MOSFET VMOS NMOS GaAsFET EPROM CMOS GaAsFET JFET SAW Op-AMP Schottky Diodes Film Resistors Bipolar Resistors ECL SCR SChottky TTL Threshold Susceptivity (Volts) 10 - 100 30 - 1800 60 - 100 60 - 2000 100+ 200 - 3000 25 - 50 140-7000 150-500 190-2500 300-2500 300-3000 300-7000 500+ 500-1000 500-2500 SEMICONDUCTOR DEVICE SENSITIVITIES

Slide 10

HUMAN PERCEPTIONS OF ESD At 3000 volts, you can ESD At 5000 volts, you can ESD At 10000 volts, you can ESD

Slide 11

Typical Electrostatic Voltages ELECTROSTATIC VOLTAGES MEANS OF STATIC GENERATION 10 TO 20 PERCENT RELATIVE HUMIDITY 65 TO 90 PERCENT RELATIVE HUMIDITY WALKING ACROSS CARPET WALKING OVER VINYL FLOOR WORKER AT BENCH VINYL ENVELOPES FOR WORK INSTRUCTIONS COMMON POLY BAG PICKED UP FROM BENCH WORK CHAIR PADDED WITH POLYURETHANE FOAM 35,000 12,000 6,000 7,000 20,000 18,000 1,500 250 100 600 1,200 1,500 OWEN J. McATEER MILITARY ELECTRONICS/COUNTERMEASURES

Slide 12

ELECTROSTATIC DISCHARGE (ESD) Billions of Dollars $$$ are squandered every year as a result of ESD harm. A huge number of dollars in PC Board buoy is the consequence of ESD harm.

Slide 13

DAMAGE MODES Catastrophic Failure Device no longer works Are for the most part gotten in-house Represents 10% of ESD disappointments Intermittent/Walking Wounded Device is operational, yet flighty and will bring about extra administration calls Most costly static issue Represents 90% of ESD disappointments

Slide 14

DAMAGES CAUSED BY ESD

Slide 15

PROPERTIES OF STATIC ELECTRICITY A charged surface has electrical potential vitality (voltage) A charged surface exudes an electric field A charged surface can create active vitality (current)

Slide 16

STATIC CHARGE GENERATORS Work surfaces Floors Chairs Clothing Papers and work arrange holders Packaging materials PERSONNEL

Slide 17

DEVICE FAILURE CAN HAPPEN AT ANY LEVEL Single gadget Circuit load up Product get together Field benefit

Slide 18

STATIC GENERATION Triboelectric charging Induction Changes in capacitance

Slide 19

TRIBOELECTRIFICATION Static Charge can be created by contact and partition of divergent surfaces. Static Charge on reaching surfaces can be expanded with expansion of erosion or rubbing .

Slide 20

INDUCTION Process of isolating charges on a material through space at a separation by the impact of an electric field . A conduit within the sight of an electric field can secure a charge and hold it. Non-conductors are captivated and ready to be pulled in to charged surfaces (like tidy to a TV screen).

Slide 21

CHANGES IN CAPACITANCE Voltage on a question is significantly influenced by the capacitance of the protest. Capacitance can change in nature because of position of the protest with respect to different questions in the range. Increment capacitance, diminishes voltage. Diminish capacitance, expands voltage.

Slide 22

MATERIALS CHARACTERISTICS Conductors Allow the stream of electrons Non-transmitters or Insulators Resist the stream of electrons

Slide 23

FACTORS AFFECTING STATIC CHARGE GENERATION Intimacy of contact Speed of partition Conductivity of materials Position on Triboelectric arrangement

Slide 24

Air Asbestos Glass Mica Human Hair Nylon Wool Fur Lead Silk Aluminum Paper Cotton Steel Wood Amber Hard Rubber Brass Silver Sulfur Polyester Polyurethane Polyethylene Polypropylene PVC Teflon MATERIALS Increasing Positive Increasing Negative

Slide 25

HOW STATIC IS GENERATED + _ Contact and Separation of Materials

Slide 26

STATIC FIELD EMANATES FROM CHARGED OBJECT 5,000 Volts 2,000V 3,000V 4,000V

Slide 27

Fundamentals of Static VOLTAGES connected with static charges can be made by : 1. Triboelectric charging 2. Induction 3. Changes in capacitance SCIENTIFIC BASIS : 1. Coulomb\'s Law like charges repulse inverse charges pull in 2. V = Q/C V = voltage in volts Q = charge in coulomb C = capacitance in farads

Slide 28

Typical Voltage Variations Monitored on a Person with No Wrist Strap Feet Raised Operator Sat Down 1550 v(max) Operator Stands Up Operator Sat Down Operator Walking Feet Lowered 1400 v(max) 1500 Voltage Pulse Height 850 v(max) 1000 3200 v/sec 5000 v/sec 3800 v/sec 500 0 Time

Slide 29

SOLUTIONS TO STATIC PROBLEMS Prevention of Charge Generation Neutralization of Charge Dissipation of Charge Shielding

Slide 30

PREVENTION Static can\'t be completely counteracted .......... Just Limited !!!!!

Slide 31

PREVENTION The property of Antistaticity is identified with Prevention of static charge era - Providing surface lubricity and somewhat leading properties normally brings about low charging properties.

Slide 32

DISSIPATION Removal of Charge from Conductors Rate of dissemination controlled by imperviousness to ground Slow rate of dispersal favored by most

Slide 33

DISSIPATION Device harm models have decided the requirement for dissipative worksurfaces . Human Body Model Charged Device Model Machine Model

Slide 34

Human Body Model oxide layer _ static release _

Slide 35

Charged Device Model _ tweezers _ release _

Slide 36

Dissipation is the most essential control property in electrostatics. Dissemination incorporates establishing of individuals, worksurfaces and deck . Electrical framework ground favored over a different framework or building ground.

Slide 37

IONIZATION Creation of free charge in gasses (typically air). Coulombs Law directs that inverse charges draw in . Ionization counterbalances static charges , one for one on surfaces. Ionization must be adjusted , generally a charge can be added to a surface.

Slide 38

Shielding is utilized to ensure electrostatic vulnerable things when they are being transported between Static Protected Areas . Protecting is a prerequisite for most classes of segments in Military and business determinations.

Slide 39

4 RULES OF STATIC CONTROL Handle all static touchy things at a static shielded work station. Transport all static delicate things in static defensive compartments. Test and screen the static control handle. Ensure each gathering in the production network takes after then over 3 rules.

Slide 40

RULE 1 - STATIC SAFEGUARDED WORK AREA Provides holding and establishing for all conductors utilized as a part of the zone, including individuals . Gives balance of charge on the fundamental non-conductors utilized as a part of the zone.

Slide 41

RULE 1 - SOLUTIONS Worksurface Materials Flooring Materials Wrist Straps Shoe Grounding Ionization

Slide 42

OHM\'S LAW VOLTS = AMPS OHMS EXAMPLE: 120 VOLTS = 120 MICROAMPS 1,000,000 OHMS

Slide 43

RULE 2 - TRANSPORTATION Products must be shielded when they are moved from the static protected work station.

Slide 44

RULE 2 - SOLUTIONS Flexible bundling - protecting packs Rigid compartments - tote boxes, plate, card transporters

Slide 45

RULE 3 - TEST EQUIPMENT Tester for Wrist/Shoe Strap. "Megger" (high voltage meter) for worksurfaces and deck. "Charge Plate" for Ionization.

Slide 46

RULE 4 Make beyond any doubt everybody that is in the supply and conveyance framework takes after the initial 3 Rules. Lead reviews on providers for conformance to Operating Procedures if vital.

Slide 47

STANDARDIZATION IN STATIC CONTROL Standards setting association exist in the US, Europe, and Internationally. The most dynamic associations are : ESD Association , EIA, JEDEC. The US Military additionally has numerous models identified with Static Electricity.

Slide 48

ESD ASSOCIATION TEST METHODS Individual Products Wrist straps, flooring, place settings and so on. Estimation Techniques Resistance, Shielding, Charge Generation Advisories Guidelines, Practices, Procedures, Definitions

Slide 49

EIA - Electronic Industry Association Packaging of Electronic Products for Shipment - EIA 541 Specifications for materials utilized as a part of bundling materials ESD Standard 625

Slide 50

PREREQUISITES FOR A SUCCESSFUL STATIC CONTROL PROGRAM A full responsibility with respect to top administration ESD control consistence on all providers A complete in-house ESD control program Advise your clients on legitimate taking care of Select an expert and educated static control seller

Slide 51

Benefits of an aggregate static control program Reduced IC a

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