C SAM – Scanning Acoustic Microscopy

Among other types of failures, acoustic techniques are particularly suitable for the detection of those irregularities involving materials and density changes, including voids and porosity as well as cracks and delamination, in any kind of EEE component.

Therefore this NON-DESTRUCTIVE testing method is included in different EVALUATION, SCREENING and LOT VALIDATION flows for several family of EEE components, which can be found in doEEEt platform.

ALTER TECHNOLOGY has a huge experience on this testing method, with the perfect cocktail of cutting edge equipment and experienced technicians.

Scanning acoustic microscopy (SAM) also denominated acoustic micro imaging (AMI) and scanning acoustic tomography (SAT) is a consolidated and recognized tool for quality control, inspection and failure analysis of microelectronic components and materials. In Alter Technology we have all the tools to help you in your design; with ONE-STOP-SHOP that means: find your components in doEEEt and test them in Alter Technology.

The working principle of the technique is based on the reflection that acoustic waves experience at the interface between different media and density irregularities. Thus, the approach makes use of focalized ultrasound (MHz to GHz) pulses to image material interfaces and boundaries as well as hidden physical damages, either generated during manufacturing or induced after environmental testing and prolonged normal operation.

As illustrated in the figure, the technique is routinely used for the nondestructive detection of internal flaws such as:

The bright and dark contrast indicates whether the defect is under of over the underfill

Conducted according to different test methods such as:

• ESCC 25200 “Application of Scanning Acoustic Microscopy to Plastic Encapsulated Devices”
• IPC JEDEC J-STD-020 Moisture/Reflow Sensitivity Classification for Nonhermetic Surface Mount Devices
• J-STD-035 Acoustic Microscopy for Nonhermetic Encapsulated Componentes 
• MIL-STD-883 “Test Method 2030 “Ultrasonic Inspection of die-attach”
• MIL-STD-1580 “Destructive Physical Analysis for Electronic Electromagnetic and Electromechanical Parts”
• NASA PEM-INST-001 “Instructions for Plastic Encapsulated Microcircuit (PEM) Selection, Screening, and Qualification” (NASA/TP—2003–2122)
• MIL-PRF-123 “Capacitors Fixed Ceramic Dielectric (Temperature Stable and General Purpose), High Reliability, General Specification For”
• MIL-PRF-31033 “Capacitor Fixed Ceramic Dielectric High-Reliability Discoidal General Specification.”
• MIL-PRF-49470 “Capacitors, Fixed Ceramic Dielectric Switch Mode Power Supply (General Purpose and Temperature Stable)”

REAL-TIME FEEDBACK

Our Virtual Lab platform for Remote Testing  provides Alter Technology users with:

• Instant access to test results
• Live chat with our inspectors during and after a test duration
• Access to Alter Technology database (30 years of accumulated data) for performance comparison with other batches and similar components.

Thanks to the Virtual Lab tool the customer can devise his own test solution specifically adapted to the actual needs and requirements and monitor test results in real time, without the need to wait for the completion of all the activities. Therefore, the final user can adapt the inspection areas and planes depending on the initial results. He will also receive feedback and advice from our test engineers during or thereupon inspection.

Detailed inspection records can be accessed immediately after the activity completion. Thus, manufacturers and users gain valuable time to develop contingency plans and solutions to address detected anomalies.

Complimentary inspection techniques

• X-ray inspection (2D and 3D tomography) 
• IR thermography 
• IR thermal microscopy 
• Raman thermometry 
• Cross-section and FIB-SEM verification.

Stress test

• Humidity, moisture, and thermal test.
• Thermal-vacuum testing 
• Temperature cycling 
• Thermal shock 
• Vibration testing 

Our commitment to quality

In Alter Technology the Scanning Acoustic Microscopy Lab involves a qualified (Ph.D., M.Sc.) and a multidisciplinary team specialized in different disciplines such as Materials Science, Physics, Electronics, and Aerospace Engineering; together with a highly experienced technical staff with a solid background in microscopy, materials analysis, and EEE inspection. This team is supported by more than 30 years of experience of Alter Technology in EEE testing and engineering.