ESD Testing Archives

Get Lean with 5S Workplace Principles


5S - Sort, Set in Order, Shine, Standardize and Sustain Recognized as one of the strategies associated with “Just in Time” manufacturing (Toyota Production System), the 5S system for workplace organization and standardization originated in Japan. The “5” relates to Read more

PCB Rework – Evolving Cleaning Methods


Smaller devices makes PCB rework harder. Today's manufacturers of printed circuit boards (PCBs) strive for quality and drive operation yields close to 99% and above – yet some boards will still fail functional tests when coming off the assembly line and Read more

Ten Labels to Solve Your Engineering Challenges


Put the right one on There’s a right label for every application and Brady has designed a handy cheat sheet to help you on your way. When choosing a label, you’ll want to ask yourself several questions – Will the Read more

ESD Mat Cleaning Dos and Don’ts

Posted on by Barb N. in ESD Mats, ESD Testing Leave a comment

How you clean your ESD mat–and with what–can make a big difference in performance and in life expectancy of the product. Excellent cleaning solutions have been specifically formulated to easily and effectively remove flux, solder, chemicals, dirt and grime without damaging your mat. Using these special cleaning products will help extend the life of your mat.

Follow these dos and don’ts when cleaning your ESD mat – 

itw-chemtronics-9700_es1664t_dv_webxlDon’t

  • Clean with alcohol or ammonia. These chemical will cause your mat to dry out and become brittle.
  • Clean with a silicone-based cleaner. It will leave a residue that could reduce the mat’s ESD capabilities.
  • Use strong chemicals. They could corrode your mat.

Do

  • Clean with the proper solution and mixture for your specific mat.
  • Create a cleaning schedule so you’ll never have to worry about residue build-up.
  • Consider the brand of the cleaner. Oftentimes companies test their cleaners on their mats.
  • Remove any residue immediately, such as flux and solder.
  • Test your mats regularly to ensure optimum performance of your ESD mat.
  • Clean your mat if the RTT or RTG tests show a rating less than normal.

 

All-Spec carries a selection of mild and highly effective ESD mat-cleaning solutions.


Putting Your Components to the ESD Test

Posted on by Barb N. in ESD News, ESD Testing, Static Control Tips and Tricks Leave a comment

Testing ESD Sensitivity 

Testing the sensitivity of components to ESD can be done in a couple of different ways. Either way, you’re determining what it takes to make a device fail when subjected to an electrostatic discharge (ESD). The two primary models for ESD testing include Human Body Model (HBM) and Charged Device Model (CDM) testing.

The models can simulate events; though they can’t completely mimic the entire range of potential ESD events. These two tests, HBM and CDM however have proven to be successful at reproducing more than 99% of ESD field failure signatures. Through these tests industries can –

  • Create and quantify suitable on-chip protection
  • Make comparisons between devices
  • Form a classification system for ESD sensitivity to help ESD design and monitoring requirements of manufacturing and assembly settings
  • Access documented test procedures to substantiate reliable and repeatable results

Human Body Model (HBM) Testing

Kid with hair standing up ESD

Human Body Model (HBM) testing

It doesn’t take much to cause a discharge. Walk across the floor in your socks and you’ you add an electrostatic charge to your body. After doing so, if you were to touch your finger to a lead on a ESDS device or assembly, the body could discharge and possibly cause damage to the device.

The oldest and most common form of testing to classify ESD sensitivity–using an ESD simulator with a special output circuit called the Human Body Model (HBM). The device is placed in a test system and contact is made through a relay matrix and the device is zapped with ESDs.

The device is considered to have failed if it doesn’t meet the datasheet parameters using parametric and functional testing. Failures usually include junction damage, metal penetration, melting of metal layers, contact spiking and damaged gate oxides.

Charged Device Model (CDM) Testing

charged device model testing

Charged Device Model (CDM) testing

A charge can also come from an ESDS device and cause an ESD event. For instance, if a device slides down a feeder in an automated assembler, the device can become charged. If it were to touch the insertion head or another conductive device, a quick discharge may take place. This represents a Charged Device Model (CDM) event and is potentially more destructive than an HBM event. Damage can take place in as little as a nanosecond.

This type of event generally happens in automated-manufacturing environments where machines may always stay turned on and cause electronic integrated circuits (ICs) to become charged. If the part touches a grounded conductor, the built-up storage of energy discharges. CDM discharge depends mostly on the parasitic parameters of the discharge as well as the size and type of component package.

To test, the device is placed on a field plate with the leads pointing up; then the device is charged and discharged.

 

All-Spec EOS/ESD Audit Kit

All-Spec EOS/ESD Audit Kit

All-Spec carries a large selection of quality ESD testing and measurement equipment such as EOS/ESD audit kits, electrostatic field meters and static locators; surface resistivity meters; and ESD event, EMI field and RF signal detectors.

All-Spec also carries a comprehensive range of ESD-safe, static control grounding supplies and partners with industry leaders like  SCS, Desco, Simco-Ion and more to offer the best static control products on the market.