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GigaDevice Semiconductor AN055, Application Note

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GigaDevice Semiconductor AN055 Application Note Download Page 14

AN055 

ESD  Static  Protection  Manual

 

14

 

 

3.5. 

After Soldering 

Even  after  soldering  and  cleaning  operations,  handling  of  electronic  components  requires 
great care. Fingerprints are extremely difficult to remove, and the conformal coated boards 
show  fingerprints  after  humidity  or  environmental  testing.  Gloves  or  other  protective 
equipment can be used to prevent such contamination. Use ESD fully protected mechanical 
racks or wash baskets during cleaning operations.

   

3.6. 

Gloves and Finger Cots 

To prevent contamination of components and assemblies, the contract may provide for the 
use of gloves or finger cots. Gloves and finger cots with EOS/ESD protection must be carefully 
selected.

   

 

 

Summary of Contents for AN055

Page 1: ...GigaDevice Semiconductor Inc ESD Static Protection Manual Application Note AN055 ...

Page 2: ...static Discharge ESD 5 1 2 Electrical Overstress EOS 7 1 3 Warning Signs 7 1 4 Protective Materials 8 2 ESD Safe Work Area EPA 10 3 Operating Precautions 12 3 1 Guidelines 12 3 2 Physical Damage 13 3 3 Pollution 13 3 4 Electronic Components 13 3 5 After Soldering 14 3 6 Gloves and Finger Cots 14 4 ESD Protection Check List 15 5 Revision history 17 ...

Page 3: ...AN055 ESD Static Protection Manual 3 List of Figures Figure 1 1 ESD Sensitive Symbols and ESD Protective Symbols 8 Figure 2 1 Series connection and parallel connection of anti static wristbands 11 ...

Page 4: ... Tables Table 1 1 Common Static Sources 6 Table 1 2 Common Behavior Electrostatic Strength 7 Table 2 1 Maximum Ground Resistance and Discharge Time Allowed for Electrostatic Safe Operation 10 Table 4 1 Check List 15 Table 5 1 Revision history 17 ...

Page 5: ...duct has passed inspection and functional testing It is still possible that it will expire after delivery to the customer It is important to protect ESD sensitive components in circuit designs and packaging Some unprotected electronics fixtures are often used in manufacturing and assembly areas to connect ESD sensitive devices Remember that ESD sensitive chips can only be removed from the antistat...

Page 6: ...s fiber Insulated wheels Packaging and Handling materials Plastic bags packaging envelopes Foam bag foam plastic Polystyrene plastic Non ESD protective boxes trays containers Assembly tools and materials Pressure injection Compressed air Synthetic brush Heat gun hair dryer Copier printer Destructive electrostatic discharges are often initiated by adjacent conductors such as human skin and onto the...

Page 7: ...r larger predecessors The use or type of device plays a decisive role in sensitivity This is because some devices are designed to respond to small electrical signals or over a wide frequency range With the reduction of the process technologies the problem of EOS will become more and more serious When considering the sensitivity of a product we must look at the sensitivity of the most sensitive com...

Page 8: ...ndard EIA 471 and IEC TS 61340 5 1 and other standards Note The absence of an ESD warning label does not necessarily mean that the component is ESD insensitive When the electrostatic susceptibility of a component is suspected it must be treated as a sensitive device before conclusions can be drawn 1 4 Protective Materials When in non EPA ESD sensitive devices must be protected from electrostatic s...

Page 9: ... ESD protected work area must be packaged with static shielding materials usually with static dissipative materials and antistatic materials sandwiched in the middle of the package Some static shielding and antistatic materials as well as some topical antistatic agents may affect the solderability of components components and materials in the process Care should be taken to select packaging and ha...

Page 10: ...the operator s body and the chip due to the current generated by carelessness or equipment failure Generally a resistor is connected to the ground path Changing the resistor will slow down the decay time and prevent current spikes from electrostatic sources In addition the power supply voltage used must be checked and appropriate protection should be considered on the workbench to prevent personne...

Page 11: ...t Protect the ground Keep static dissipative and antistatic surfaces free of static sources of materials such as Styrofoam plastic tin absorbers paper packaging bags plastic or paper notebook folders and personal employee items Periodically check the bench ESD protected area EPA to ensure its effectiveness Improper grounding or oxidation of the ground may cause damage to the EOS ESD equipment and ...

Page 12: ...lity and coating adhesion problems 6 The PCB test board or chip cannot be stacked The stack is susceptible to physical damage delineate a specific assembly area in the test area use specific ESD racks for temporary storage 7 Even if there is no ESD mark on the chip and PCB packaging the chip or PCB to be operated should be the ESD sensitive device or component by default 8 Testers must be trained ...

Page 13: ...tings or encapsulations Ordinary cleaning methods cannot remove all contamination It is therefore important to minimise the chance of contamination The best solution is prevention frequent washing and only taking the edge of the board without touching the connectors or pads will help reduce contamination When required using pallets and brackets will also help reduce contamination during assembly T...

Page 14: ...show fingerprints after humidity or environmental testing Gloves or other protective equipment can be used to prevent such contamination Use ESD fully protected mechanical racks or wash baskets during cleaning operations 3 6 Gloves and Finger Cots To prevent contamination of components and assemblies the contract may provide for the use of gloves or finger cots Gloves and finger cots with EOS ESD ...

Page 15: ...ered with clothing Changing frequency What material was used Operating area management requirements What management requirements are implemented Which clause covers the activity management of products and people Are they displayed and visible Choose tool and suction pen What wafer or die choose tool was used Are they ESD safe How and when to check them for damage What cleaning program is used Twee...

Page 16: ...n to protect against ESD damage Are there any local sources of electromagnetic or electrostatic fields that could damage the product Radiation What measures are taken to protect against radiation damage How to limit nearby radiation sources such as mobile phones WiFi microwave ovens etc ...

Page 17: ...AN055 ESD Static Protection Manual 17 5 Revision history Table 5 1 Revision history Revision No Description Date 1 0 Initial release Apr 20 2022 ...

Page 18: ...ordinary business industrial personal and or household applications only The Products are not designed intended or authorized for use as components in systems designed or intended for the operation of weapons weapons systems nuclear installations atomic energy control instruments combustion control instruments airplane or spaceship instruments transportation instruments traffic signal instruments ...

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