The difficulty experienced due to the passivation layer while carrying out a ball shear test on first ball bonds can be addressed with a solution provided by Nordson DAGE. The polyimide passivation layer has a thickness of up to 10µm or more, which restricts the shear tool from accessing the ball bond, especially in ultra fine pitch applications. This, in turn, affects the application of the full load and eventually leads to inconsistent bond strength measurements. In some cases, it is even impossible to perform measurements.
Nordson DAGE Software
With the help of Nordson DAGE Software option, the shear tool can be driven by the operator through the passivation layer (Figure 1). The normal software is set to control the shear tool landing on the surface nearby the bond, stepping it back to a prescribed height. Conversely, with this specific software option, operators can enter a step down value equal to the passivation layer thickness.
Figure 1. Ball shear test with passivation layer.
With the step down value, the sharp tipped shear tool can cut through and remove the passivation layer during the shear action. The bond strength is accurately measured by filtering out the forces applied by the shear tool for the passivation layer removal.
It is simple to set up the ball shear test using the Nordson DAGE Software option. After selecting the correct option and entering the step down value, the test can be performed as normal. The sample screen is depicted in Figure 2.
Figure 2. Sample screen.
The Nordson DAGE Paragon™ software is embedded with optional passivation software. Load tool size face width needs to be specified in the order. For instance, 4000PLUS- PASSIV-LT-30 is recommended to be used to order a 30kg load tool. The S25g and S250g load cells for the Nordson DAGE 4000Plus bondtester have these options.
Features and Benefits
The following are the key features and benefits of the Nordson DAGE solution:
- The combination of hardware and software enables obtaining consistent bond strength measurements by enabling the application of full load on the bond by the shear tool
- The passivation layer can be cut down and removed with the sharp shear tool
- Test can be set up and performed quickly
- Software compensation eliminates forces applied for the removal of the passivation layer, thus ensuring an accurate bond strength measurement
About Nordson DAGE
Dage was founded in 1961 and is a market leader in its chosen markets of Semiconductor and PCBA Manufacture. It has an award winning portfolio of Bondtester and X-ray Inspection Systems for destructive and non-destructive mechanical testing and inspection of electronic components.
Dage was acquired by the Nordson Corporation in 2006.
Nordson DAGE has a strong portfolio of award winning products for destructive and non-destructive mechanical testing and inspection of electronic components. It has an excellent, wholly owned distribution and support network of seven offices covering Europe, Japan, China, Singapore, and the USA, and maintains representative offices in other territories.
With its self-contained R&D facilities, Nordson DAGE has developed world-leading products for testing wire bonds on semiconductor packages such as BGA, Chip Scale Packages (CSP) and other electronic components. More recently Nordson DAGE has been heavily involved in the testing of the newest technology 300 mm wafer bump shear.
Nordson DAGE has developed an excellent suite of award-winning X-ray inspection equipment targeted at both the Semiconductor and PCBA markets.
Control of the patented core technology of X-ray tube manufacture ensures that the high-resolution X- ray will detect, identify and measure even the smallest of features. Nordson DAGE's high precision, state-of-the-art inspection equipment when joined with their sophisticated software offerings, ensure that the equipment is simple to use.
Our core strategy:
- To support our customers wherever they do business,
- To continually develop new products that provide its customers with enhanced competitive advantages,
- To develop products which bring new advantages to its customer base
- To control the core technologies that underpin its products.
This information has been sourced, reviewed and adapted from materials provided by Nordson DAGE.
For more information on this source, please visit Nordson DAGE.