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ESD Protection DiodeApplication Note
© 2011 Globaltech Semiconductor Co.
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ESD IntroductionESD is the discharge of static electricity. Static electricity is an excess or deficiency of electrons on one surface with respect to another surface or to ground. A surface exhibiting an excess of electrons is negatively charged, and an electron deficient surface is positively charged. Static electricity is measured in terms of voltage (volts) and charge (coulombs).
Electrostatic Discharge (ESD) frequently occurs in nature, as well in Manufacturing environments and in-use finished electronic equipments.
The Discharge occurs at our fingertips when our body is electrically charged and is in close proximity of contact points attached to electronics devices.
The latest IC technology is becoming more sensitive to these events due to the extreme complexity of circuits, and the size of the semiconductor structures used so, circuit designers must provide an effective ESD Protection.
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Implications of ESD on IC industry
Major reliability threat in IC industry :-Cause of approximately 1/3 of IC failures-ESD protection is very challenging against rapidly changing technologies
Standard model is used to characterize ESD :- Human Body Model (HBM)- Machine Model (MM)- Charged Device Model (CDM)
ESD control is indispensable throughout devices’ life :- Eliminating static charges from the workplaces- Proper handling from manufacturing, shipping and field handling- On-chip protection (clamp input voltage and bypass ESD current)
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ESD Requirements (U.S.A.)Human Body Model+/- 2 kV Required by most customers Waivers given at 1 KV in some cases+/- 4 kV Delco (Auto Manufacturer)+/- 8 kV On Special Automotive Pins (Power Outputs)
Machine ModelNo Standard for reliable testing Waivers given to 100 V in some cases
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Protection SchemesThe solutions for avoiding or reducing ESD failures1) identifying and rectifying possible ESD sources.2) identifying and undertaking adequate prevention measures while handling the
ESD sensitive devices.3) incorporating built-in ESD protection networks in devices.4) providing awareness and training to users at all levels.
Two ways to reduce IC failures under ESD conditions :
The first approach focuses on reducing the amount of ESD induced charges and redistributing them through proper handling of devices and controlling the handlingenvironments.
The second approach is to implement on-chip protection circuits in order toimprove the circuit robustness against ESD events by improving ESD performance of the individual circuit components.
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Typical Generated ESD Voltages
Examples of Static Generation Typical Voltage Levels
65-90% RH10-25% RHMeans of Generation
1,500V18,000VChair with urethane foam
1,200V20,000VPoly bag picked up from bench
100V6,000VWorker at bench
250V12,000VWalking across vinyl tile
1,500V35,000VWalking across carpet
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International ESD ModelsThe ESD events are modeled under several industry standards, where the Most representatives and accepted are:
• IEC 61000-4-2 (Recognized internationally)• MIL STD 883• JEDEC A114 and A115
0200MMJEDEC A115
1500100HBMMIL STD 883
330150HBMIEC61000-4-2
R, OhmsC, pFModelStandard
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Human Body Model (HBM)
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Machine Model (MM)
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Electrostatic Discharge (ESD)IEC 61000-4-2
816308154
61222.5683
4815442
247.5221
Peak Current
at 60ns (A)
Peak Current
at 30ns (A)
First Peak
Current (A)
Test Voltage Contact Discharg
e (kV)
Test Voltage
AieDischarge
(kV)
LEVEL
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Electrical Fast Transient ( EFT )IEC 61000-4-4
4028044
2014023
100.52012
50.25100.51
ISC (A)VOC (kV)ISC (A)VOC (kV)Level
I/O, Signal, Data & Control Lines
Power Supply Port
Peak Amplitude
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Surge immunity ( Lighting )IEC 61000-4-5
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Transient Suppression•Constant advances in semiconductor process technologies make the design ofprotection very challenging.•Protection circuit must divert transient current and clamp transient voltage below the failure threshold of the protected.
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ESD Testing Setup
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ESD Protection DiodeApplication Field
•Inkjet•Laser Jet•Photo Printers•Card Scanners•USB Film Scanners•Flatbed scanners
•CD RW/CD ROM/HD•DVD Drivers•Ext Floppy Dr•Flash Readers•Removable Disks Dr•Solid State Drivers
•I-Pods•MD Players•MP3 Players
•Bluetooth Adapters•Direct Connect•USB Ethernet•USB Phone Line Network•USB Wireless Network
•56K USB Modems•Cable Modems•Internet Telephony•ISDN Modems•XDSL Modems
Printers & Scanners
StoragePortable Audio Video
NetworkingModems & Telephony
•Mice•Wireless Keyboard•Remote Control•Digitizing Tablets•Trackballs
•Audio headsets•Microphones•Speakers•TV Tuners•Video Capture
•Gaming Pads•Joysticks•Steering Wheels•PS2/PSP/XBOX
•PDA•GPS•NES
•Digital Photo Frames•Digital Cameras•Portable Web cams•Web cams
Input DevicesGraphics & Sound
Game Controllers
GadgetsDigital Photography
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ESD Protection Diodefor Ethernet
GSE0504SOT-363
GSE0514SOT-563
GSE0505SOT-23-6L
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ESD Protectionfor Cell Phone / Smart Phone
GSE0514SOT-563
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ESD Protection Diodefor Cell Phone / Smart Phone
GSE0521SOD-523
GSE0572SOD-723
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ESD Protection Diodefor Cell Phone / Smart Phone
GSE0562SOD-323
GSE6V8UWSOT-363
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ESD Protection Diodefor LCD TV/DVD/Set-Top Box
GSE6V8UDDFN-10
GSE6V8UHMSOP-10L
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ESD Protection Diodefor Notebook / i-Pad
GSE6V8UDDFN-10(HDMI)
GSE0504SOT-363(USB 2.0)
GSE6V8UFSOT-23-6L(USB 3.0)
GSE6V8UWSOT-363(USB 3.0)
GSE0514SOT-563
(IEEE 1394)
GSE0505SOT-23-6L(IEEE 1284)
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Thank you