ESD PREVENT AND GROUNDING Vincenc Home Development Co

ESD PREVENT AND GROUNDING Vincenc Home Development Co. , LTD Speaker: Dr. C. Y. Tsai MK MASTER INC. 1

ESD prevent course contents(1) 1. Static electricity: ESD cause, measurement, norm, and preventive methods. 2. Static electricity compare with usual electrical engineering systems. 3. Static electricity caused damage and effect( discharge phenomena/dynamics phenomena) 4. Surface resistance sorting. 5. Humidity has an effect on ESD. 6. How to make ESD prevent? a. Five kinds of basic ESD eliminations b. Standard prevention of production lines. 7. Conductive wrist band : a. standard use b. inspection c. compare between wire wrist strap and wireless wrist strap. 8. Ground system monitor、ion fan、prevent ESD detergent、 surface resistance inspection instruments and surroundings electrostatic voltage using methods and surrounding electrostatic voltage using areas. MK MASTER INC. 2

ESD PREVENT COURSE(2) 9. The blind point of tradition ESD prevent. 10. Why grounding? 11. ”ground“ and “Grounding” related technical terms. ( electric ground. circulation area. Ground potential、 logic ground, 、 geography ground、grounding resistance、 grounding system) 12. The measurement and defect of tradition grounding resistance. 13. The inspection of production line grounded. 14. How to avoid ESD happening? 15. How to show to customer ESD prevent? a. motionless state b. motion state MK MASTER INC. 3

Factory location ESD prevent basic rules 1. Adopt which ESD prevent standard: JEDEC JESD 625 -A, ANSI/ESD S 20. 20 -1999 , ESD TR 20. 20 -2000, IEC 61340 -5 -1, IPC-A-610 C, CECC 000 15 (EN 100 015 -1), Japanese static electricity safety policy, international standard『 The general guide of prevent ESD incident 』( GB 12158 -90 )etc. Suggestion: synthesize the merits of all methods , to create your own method which is suitable for your company and advance quality yield. 2. ESD education training and responsible people. 3. ESD interior investigation and to improve and trace the incomplete investigation. 4. ESD prevent system filing. MK MASTER INC. 4

PURCHASING PEOPLE Must know-how ESD knowledge, and ESDS( static electricity sensitive devices) data sheets. Basic knowledge and demand for packaging and transportation MK MASTER INC. 5

FACTORY STAFFS 1. Four kinds of grounding, according to standard, apart, individual grounded. 2. Offer standard and stable power for interior factory. 3. Make sure the temperature, humidity, and floors match the standard of EOS/ESD. 4. All grounding internet and power outfit must be filed and periodic maintenance. MK MASTER INC. 6

ON PRODUCTION LINES 1. All workers must have strong conscious of ESD, respect the spirit of EPA. 2. In EPA entrance area，whethere is “EPA exist” warning sign or not? 3. Whethere is supervision and record for room temperature and humidity? 4. Before working daily, must test the conductive wrist strap and conductive shoes and record. 5. In EPA area, floors, chairs, tables, operator dresses, handcarts whether or not meet the requests of EOS/ESD , and keep all testing records for point to point and point to grounded. 6. Spare parts saving boxes, packing parts whether or not match the standard of ESD. MK MASTER INC. 7

On production lines (continuity) 7. The elements of Fixed-frame, transit belt equipment, and test tooling whether or not with prevent ESD? 8. Unless necessary insulated items, not allowed to show up at EPA areas. 9. Whether or not using ion blower correctly, checking whether has collate records of balance, scatter timing. . etc. ? 10. Make sure equipments grounded correctly, checking whether or not the pole is at right direction? 11. Make sure to separate the ground of ESD from the ground of equipment correctly. 12. Necessary needed test instruments: testing instruments for conductive wrist band conductive shoes, surface resistance, grounded system monitor. MK MASTER INC. 8

WAREHOUSE 1. Whether the floors meet the methods of ESD prevent, whether have testing records for point to point and point to grounded? 2. Storage racks set up the preventive ESD mats, and the mats connected with grounded frame is good enough? 3. Every wrist strap or heel strap, conductive shoes checked and recorded daily? 4. Package materials meet requests? 5. Handcart must meet the request of ESD, wheels must be conductive wheels. Is there any record for surface resistance testing? 6. In electric devices inspection workstations, is there met the preventive requests of ESD? 7. Having to invigilate and record the temperature and humidity? MK MASTER INC. 9

EOS/ESD What is called “ ESD”? The reasons caused ESD: touched separation, damaged separation, induction separation, …etc. ESD = Electro Static Discharge EOS = Electrical Over Stress EPA = ESD Protected Area l EMP=electrostatic discharge bring about electromagnetic pulse ，Spectrum width can reach to MHZ~ GHZ。 MK MASTER INC. 10

ELECTROSTATIC PHENOMENON Electrostatic conduct: a. Dynamics phenomenon: absorbed Particle。 b. Discharge phenomenon: 1. shock、explode。 2. damage components. MK MASTER INC. 11

THREE KINDS OF ESD MODELS 1) HBM: Human Body Model 2) MM: Machine Model 3) CDM: Charged Device Model MK MASTER INC. 12

Material rub against generate static electricity + air fur of animals Human hands asbestos rabbit fur glasses mica human hairs nylon wool solid rubber polyester lead silk fabric paper cotton steel wood amber wax nickel copper brass gold platinum sulfur acetate manmade silk pollywog celluloid --- -- +7 -MK MASTER INC. polypropylene polyvinylchloride silicon PTFE --－ － polyurethane polyethylene － -- --+8 -- --13

Static electricity damage generation model Separate electric charge (positive and negative) Positive and negative charge separate Cumulate on equipments Cumulate on product Vanish or disperse electricity discharge Damaged IC MK MASTER INC. 14

Static electricity application and jeopardize Application： dust collecting 、painting、selection、spray、 photography and etc。 Jeopardize ：damage to semiconductor、generate explode in place of inflammables。 MK MASTER INC. 15

Damaged IC caused by electrostatic MK MASTER INC. 16

Peak value of location temperature and humidity (Taiwan from 1987 to 1988/central weather bureau)) Kellung Taipei Taichun Yusan Tainan Kaoxioang temperature 8. 0~35. 6 7. 1~37. 7. 0~35. 2 4 ℃ 9. 9~18. 0~35 8. 8~34. 1 temperature 9. 7~37. 1 10~38. 2 ℃ 7. 8~35. 3 8. 4~19. 2~34. 6 12. 4~33. 4 humidity ％RH 39~94 29~88 15~92 11~93 28~94 26~89 humidity ％RH 30~95 21~91 27~89 8~94 34~95 29~89 MK MASTER INC. 17

Humidity CECC 000 015 R. H. : (20%~80%) 3% JEDEC R. H. : 40% ANS I/ESD – S 20. 20 R. H. : 30%~70% ESD TR 20. 20 R. H. : 30%~70% IEC R. H. : 50% IPC R. H. : 40% GB 12158 -90 R. H. : 50% Electrostatic safety factor R. H. : 50%~65% MK MASTER INC. 18

Relation of humidity and static voltage source generation 10 -20% ( humidity) 65 -90% ( humidity) Walking on a carpet 35, 000 V 1, 500 V Walking on a ethylene plastic floor 12, 000 V 250 V Working at a worktable 6, 000 V 100 V Take out DIP dice from plastic tube 2, 000 V 200 V Pick up a plastic 20, 000 V 1, 200 V On a work chair with uricamine spume mat 18, 000 V 1, 500 V *The information copied from US Ministry of National Defense, manual of military rule 263. 1980, from 2 and 3 MK MASTER INC. 19

Electronic components to ESD sensitivity Description range of breakdown voltage RF-FETS (MICROWAVE) 1 V ~ 5 V MR-HEADS 5 V PENTIUM 5 V V. MOS 30 V ~ 1800 V MOSFET 100 V ~ 200 V EPROM 100 V J. FET 140 V ~ 7000 V SAW 150 V ~ 500 V OP AMP 190 V ~ 2500 V CMOS 250 V ~ 3000 V MK MASTER INC. 20

Five kinds of basic ESD eliminations 1. Grounding 2. Increase humidity 3. Use against conductive materials 4. Use ESD elimination instruments 5. Lower chafe speed MK MASTER INC. 21

Production lines related ESD equipments using 1. Wrist strap and wrist shoes testing instrument 2. Ion fan 3. Surface resistance inspection instrument 4. surroundings electrostatic voltage inspection instrument 5. Grounding system monitor MK MASTER INC. 22

WRIST STRAP AND WRIST SHOES n Standard use for wrist strap n Wrist strap inspecting n Compare between wire wrist strap and wireless wrist strap n Wrist Shoes MK MASTER INC. 23

ESD prevent wrist strap correct use B MK MASTER INC. A 24

Wrist band test instrument A USA： 750 K ~ 10 M B MK MASTER INC. EU： 900 K ~ 35 M 25

Wrist strap inspecting station Wrist Strap =Wrist Band + Grounding Cord A D B E C Someone called “ it’s for wrist band grounding inspection”. Actually, it’s nothing concerns with grounding, only testing recycle resistance between A and B( included human body). Hanging one grounding cord is not correct use at inspecting station. Grounding Cord MK MASTER INC. 26

2003 ESD TUTORIALS MK MASTER INC. 27

2003 ESD TUTORIALS MK MASTER INC. 28

2003 ESD TUTORIALS MK MASTER INC. 29

2003 ESD TUTORIALS MK MASTER INC. 30

How to proceed ESD prevent? 1. All conductive items must be grounding. 2. All insulations must be ionized. 3. All sensitive semiconductor components can only be opened, assembled, repaired at EPA stations. 4. Out of EPA station, must be met ESD prevent request for the materials of transportation and packages of the sensitive semiconductor components MK MASTER INC. 31

ION FAN Active ion and passive ion neutralization AC/DC ion fan Best choice: set up automatic ion balance sensor，to offer “ just in time “ efficient and stable ion balance liquid, easy to set up and take off when repairing and cleaning. Digitized design can offer data analysis and read, and included automatic ion balance adjuster. User can establish ion balance sensitivity warning value according to their demand connect with internet monitor to control. MK MASTER INC. 32

ESD PREVENT EQUIPMENT(EXAMPLE) Besides, having conductive floors, conductive chairs, packaging, and movement materials…. etc. MK MASTER INC. 33

ESD PREVENT TEST EQUIPMENTS(EXAMPLE) MK MASTER INC. 34

Grounding objects Why grounding? 1). Avoid shocking 2). start prevent equipments、avoid fire affairs and explosion 3). Avoid electroshock 4). Avoid electrostatic 5). Avoid motley messages obstruction MK MASTER INC. 35

What contains grounding resistance? 1) Resistance of production lines and grounding 2) grounding rod and soil contact resistance 3) Soil resistance within 20 M of half diameter　 　　　 MK MASTER INC. 36

Corrective actions for ESD grounding 1. ESD grounding must have the owned connections which can not share with AC power grounding! 2. Separating four kinds of grounding! 3. ESD grounding must be watched at all times. ! 4. Neutralize cord (N) and fire cord (H, L) can not be reverse connected！ MK MASTER INC. 37

IPC-A-610 C-3 -002 1 M Ohm 10% Wrist Strap Table Mat 1 M Ohm 10% Floor Mat 1 M Ohm 10% MK MASTER INC. 38

The defect of tradition grounding measurements Assist grounding rod 30 cm straightedge test cord 1). Factory located at high floors caused not easy to start building. 2). Assist grounding rod too short, only 20 cm. The depth is not enough. Read value be effect on weather easily. MK MASTER INC. 39

Corrective ideals of complete grounding ESD = Bonding + Grounding MK MASTER INC. 40

Underground prevention Grounding system monitor 1) increase quality yield 2) increase appearance Reverse thinking: the expense of improved quality is saving money for company, not for spending money. MK MASTER INC. 41

Factory grounding plan 1. ESD grounded can not share the same connection with AC power grounding. 2. Separate four kinds of grounding. 3. ESD grounding must be supervised by 24 hours per day! 4. Neutralize cord (N) and fire cord (H. L) can not be reverse connected! MK MASTER INC. 42

Problem of grounded sharing connection If equipment has leakage status, it will make reverse leakage and discharging to components through human body, and caused damage. Reverse current discharge equipment Equipment grounded Human body and equipment share grounding MK MASTER INC. 43

Human body grounding plan Car parking area Electricity area Grounding monitor Human body grounding Equipment grounding MK MASTER INC. 44

Grounding rod specification Welding with hydrogen-oxygen, outside be coating with isolated lacquer 6 M Up to Diameter 5/6” brass rod 3 M MK MASTER INC. 45

Lightning conductor grounding plan 1. Lightning conductor grounding must be away from others up to 20 M. 2. Not allow anyone taking a walk on lightning conductor rod grounded. 3. Not too close to building that might be caused steel charging inside of building when lightning. greensward Road for traffic Lightning conductor grounding rod greensward Office building MK MASTER INC. dormitory 46