Select Language
English
French
German
Italian
Spanish
MENU
Toggle navigation
Products
ESD Bags & Labels
Static Shielding Bags & Film
Metal-In Shielding Bags
Metal-Out Shielding Bags
Shielding Bubble Bags & Film
Shielding Bubble Bags
Shielding Bubble Film
Moisture Barrier Bags
SCS Dri-Shield® 2000 Bags
SCS Dri-Shield® 2700 Bags
SCS Dri-Shield® 3000 Bags
SCS Dri-Shield® 3400 Bags
SCS Dri-Shield® 3700 Bags
SCS MIL-PRF-81705E Type I, Class 1
SCS 3370 Moisture Barrier Bags
Certified Clean Bags & Film
Certified Clean Bags
Certified Clean Film
Ultra Clear Barrier Bags
Antistatic Pink Poly Bags
Pink Poly Bags with Zipper
Pink Poly Bags without Zipper
Antistatic Pink Bubble Bags
Conductive Black Bags & Film
Conductive Black Bags
Conductive Black Film
Gusset Bags
Side Gusset
Stand Up Bottom
Desiccant
Humidity Indicator Cards
Labels & Label Dispensers
BGA Rework
Accessories
Scorpion Rework System
Continuous Monitors
Workstation Monitors
Single-Wire Continuous Monitors
Dual-Wire Continuous Monitors
Equipment Ground Monitors
SCS Ground Master Monitor
SCS Ground Man Plus Monitor
ESD Event Monitors
SCS EM Aware Event Monitor
SCS Static Management Program
SMP Diagnostic Kit
ESD Field Service & Vacuums
Field Service Kits
Vacuum Cleaners
Flooring
Statguard Floor Care System
Statguard Dissipative Floor Finish
Statguard Floor Cleaner
Statguard Floor Neutraliser
Statguard Floor Stripper
Statguard Conductive Floor Epoxy
Floor Matting
Vinyl Floor Matting
Rubber Floor Matting
PVC Floor Matting
ESD Tiles
8400 Series Vinyl Floor Tiles
FreeStyle 8400 Interlocking Tiles
Floor Accessories & Grounding
Straight Cords
Straight Cords with Conical Head
Floor Marking Tape
Copper Earthing Tape & Kit
Adhesive
Adhesive Tape
ESD Footwear
3-Layer Non-Marking Foot Grounders
Heel Grounders with Hook-and-Loop Straps
Heel Grounders with Elastic Back & Hook-and-Loop Straps
Heel Grounders with Elastic Straps & Clip Fastener
Shock Cord Foot Grounders
Snap-loc Heel Grounders
Wescorp Foot Grounders
Disposable Heel Grounders
Disposable Conductive Booties
SCS Standard Style Foot Grounders (One Sole)
SCS Cup Style Foot Grounders (Two Soles)
SCS Specialty Foot Grounders
Footwear & Wrist Strap Testers
Data Acquisition
SmartLog Pro® 2
Footwear & Wrist Strap Testers
Combo Tester X3
Combo Tester
High-Speed/High-Accuracy Wrist Strap & Footwear Tester
High-Speed/High-Accuracy Wrist Strap & Footwear Tester with Output
Compact Wrist Strap & Footwear Tester
Wrist Strap Testers
High Speed/High Accuracy Wrist Strap Tester
Compact Wrist Strap Tester
Portable Wrist Strap Tester
AC Outlet Analyser and Wrist Strap Tester
Calibration Units for Testers
Static Control Garments, Gloves & Masks
Statshield® Smocks
Blue Smocks
Black Smocks
Polo Shirts
Lab Coats & Jackets
Gloves
Masks
Hand Tools
Cleaning Brushes
Dissipative Brushes
Conductive Brushes
Menda Probes
Menda Workstation Tools
Cable Control
Workstation Organisers
Harnessing Wire Threader
Tronex Precision Hand Tools
Cutters
Pliers
Handling & Storage
Ultra Clean Kitting Trays
SMD Storage Products
PCB Storage Products
PCB Racks & Holders
PCB Containers
Hanging Bins
Protektive Pak® Plastek Products
Plastek™ In-Plant Handlers
Plastek™ Storage Containers
Plastek™ Open Bin Boxes
Protektive Pak® Dissipative Corrugated Products
Protektive Pak® Dissipative Corrugated Products
Velostat® Containers
Ionisation
Bench Top Ionisers
Bench Top Mini Zero Volt Ioniser
Bench Top Zero Volt Ioniser
Benchtop AC Ioniser
SCS Bench Top Air Ionisers
Overhead Ionisers
Chargebuster Overhead Ioniser
Overhead Zero Volt Ioniser
SCS Overhead Air Ioniser
Forced Air Ionisers
Ion Python Point-of-Use Ioniser
SCS Ionised Air Gun
Viper Ion Gun
Meters & Measurements
ESD Event Detection
SCS ESD Pro Event Indicator
SCS EM Eye Meter
Body Voltage Meter
Resistance Testers
Surface Resistance Test Kit
Analogue Surface Resistance Meter
Low Resistance Tester
Surface Resistivity Checker
Portable Surface Resistance Probe
SCS 701 Analogue Surface Resistance Meter
Concentric Ring Probes
Cylinder Probes
Portable Charged Plate Monitor
Static Field Meter & Ionisation Test Kit
ESD Survey and Assessment Kits
SCS Ground Pro Meter
ESD Packaging
Foam
Cushioning Foam
Pin-Insertion Foam
Hook-and-Loop Straps
IC Shipping Tubes
Protektive Pak® Dissipative Corrugated Products
Protektive Pak® Dissipative Corrugated Products
Plastek™
Plastek™ Circuit Board Shipper
Rigid Conductive Boxes
ESD Tags
Soldering Supplies
Desoldering Braid
Sea Braid
Lead-Free
One-Step
Quick Braid
ESD Tape
Wescorp™ Antistatic Cellulose Tape
Wescorp™ Antistatic Cellulose Tape with Symbols
Wescorp™ Conductive Grid Tape
Wescorp™ Antistatic High Temp Masking Tape
Wescorp ESD Hi Temp Polyimide Tape
Tape Dispensers
Packaging Tape
ESD Working Surface Matting & Grounding
Working Surface Matting
Rubber Working Surface Matting
Vinyl Working Surface Matting
Shelf Matting
Bench Top Turntables
Working Surface Grounding
Straight Cords
Straight Cords with Conical Head
Link Cords
Earth Bonding Point Cords
Earth Facility & EBP Brackets
Earth Bonding Point Plugs
Earth Bonding Point Bars
Earth Bonding Point Boxes
SCS Grounding Systems
Working Surface Hardware
Workstation Accessories
EPA Warning Signs
ESD Awareness Guide
Document Handling
Ring Binders
Clipboards
Document Wallets & Holders
Maintenance Products & Accessories
Reztore® ESD Surface & Mat Cleaner
Reztore® Antistatic Coating
Reztore® ESD Hand Lotion
Menda Badge Holders
ESD Badge Holders
Menda Connector Covers
Menda Dispensing Bottles
Cone Top Bottles
One-Touch Bottles
Pure-Touch Bottles
Trigger Sprayer Bottles
Take-Along Bottles
Pure-Take Bottles
Twist-Lock Bottles
Flux Dispenser Bottles
Wash Bottles
Bottles Only
Pumps & Stems
Pump & Bottle Accessories
Menda Stainless Steel Drinking Cup
Menda Workstation Organisers
Waste Bins & Liners
Workstation Covers
Workstation Divider
ESD Wrist Straps & Coiled Cords
Single-Wire Wrist Straps
Wrist Strap Sets
Wristbands
Coiled Cords
Dual-Wire Wrist Straps
Wrist Strap Sets
Wristbands
Coiled Cords
Clearance
Bags and Labels
Continuous Monitors
Desoldering Braid
Field Service and Vacuums
Foot Grounders
Footwear & Wrist Strap Testers
Handling & Storage
Ionisation
Menda Dispensing Bottles
Tape
Working Surface Matting & Grounding
Workstation Accessories
Wrist Straps & Coiled Cords
New Products
ESD Services
ESD Survey
EOS ESD Assessment
Product Demonstration
ESD Training
Distributors
Technical
Resources
ESD Library
Webinar
LOGIN
SHOP
RPL
CART (
0
)
$USD
SUBSCRIBE TO OUR EMAIL LIST - Be the first to know
about exclusive deals, tips, new products & more!
Questions And Answers
#
970
List All Questions
Search
List by Category
Question
When we don't know if the electric static voltage will destroy the compents, we must design some different models to test it, such as HBA model, Machine model, e.g. Now, could you tell me how many models there are in electronic industry field and the details to design? - Anonymous
Answer
There are three models to simulate an ESD event in the electronics industry.
1- Human Body Model (HBM), [100 pF @ 1.5 kilohms], ESD STM5.1
2- Charge Device Model (CDM), [4 pF/30 pF], ESD DS5.3.1
3- Machine Model (MM), [200 pF @ 0 ohms], ESD STM5.2
The most well understood and often used model for controlling an ESD control program is the HBM. The least understood and often overlooked model is the CDM. The CDM is important to understand as well. A device may charge on its own during transportation, kitting, etc. and discharge when brought into contact with any conductor, whether grounded or not.
The ESD Association has standards for all 3 models which may be obtained directly from them at: [ http://esda.org/standards.html ]
There are 3 classifications based on 3 different ESD models which are detailed standards from the ESD Association: [ http://esda.org/ ]
HBM
=====
The most common model is the HBM. This model simulates when a discharge occurs between a human (hand/finger) to a conductor (metal rail). The equivalent capacitance is 100 picofarads (100 x 10^-12 Farads) and equivalent resistance is 1,500 ohms to simulate a human body. The typical rise time of the current pulse (ESD) through a shorting wire averages 6 nanoseconds (6x10^-9 s) and larger for a higher resistant load. The peak current through a 500 ohm resistor averages 463 mA for a 1,000 volt pre-charge voltage.
HBM ESDS Component Classification
Class Voltage Range (V)
0 < 250
1A 250 to < 500
1B 500 to < 1000
1C 1000 to < 2000
2 2000 to < 4000
3A 4000 to < 8000
3B > or = 8000
CDM
=====
The most neglected of models that can compromise your ESD control program. Here, it is the ESDS device itself that becomes charged (sliding out of a tube/bag/sorter/etc) and when contacting a grounded conductor (table top/hand/metal tool) will discharge to that conductor and may result in damaging ESD. Using a 4 pF or 30 pF verification module which can simulate from 2 to 30 Amps peak current for non-socked and up to 18 amps for socketed devices.
CDM ESDS Component Classification
Class Voltage Range (V)
C1 < 150
C2 150 to < 250
C3 250 to < 500
C4 500 to < 1000
C5 1000 to < 1500
C6 1500 to < 2000
C7 > or = 2000
MM
======
Testing components to the Machine Model (MM). The tests replicate MM failures and tell you the MM ESD sensitivity levels for your Devices. The criteria (200 pF @ a nominal 0 ohms).
7.1.2. Machine Model Sensitivity:
A source of damage for the MM is a rapid transfer of energy from a charged conductor to the conductive leads of the device. This ESD model is a 200 pF capacitor discharged through a 500 nH inductor directly into the device with no series resistor. Due to the lack of a series current limiting resistor, this model approximates a voltage source. In the real world this model represents a rapid discharge from items such as, charged board assembly, charged cables, or the conduction arm of an automatic tester. The discharge itself is a sinusoidal decaying waveform with a rise time of 5-8 nanoseconds and a period of approximately 80 nanoseconds.
Control to this model would entail knowing the ESD sensitive devices MM ESD component classification and keeping all voltages below their MM Classes voltage range.
MM ESDS Component Classification
Class Voltage Range (V)
M1 < 100
M2 100 to < 200
M3 200 to < 400
M4 < or = 400
Related Categories:
ESD Models
If you have found this Q/A useful, please rate it based on its helpfulness.
This question has been rated:
(
0
% at
0
Ratings)