- Posted by Francisco Javier Aparicio Rebollo
- On November 29, 2021
C-SAM is a reliable and powerful tool for the non-destructive testing of microelectronic parts and base materials. Moreover, it is mandatory for different applications such as those described below for different sectors.
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Scanning acoustic microscopy (SAM) is essential in the non-destructive screening of potential defects in critical systems. Therefore, space agencies routinely use and require SAM inspection as a mandatory test before the implementation in spacecraft, for instance in the regulations included below. This is so due to the capability to perform detailed and comprehensive internal inspections in complex 3D assemblies.
- 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
- NASA PEM-INST-001 “Instructions for Plastic Encapsulated Microcircuit (PEM) Selection, Screening, and Qualification” (NASA/TP—2003–2122)
- NASA EEE-INST-002 “Instruction for EEE Parts Selection Screening Qualification and Derating” (NASA TP-2003-212242)
Defense and Aerospace
Military, aerospace and space applications define the higher quality levels in terms of reliability and durability, even under aggressive environmental working conditions. According to these specifications, EEE parts must be systematically analyzed after stress tests by either destructive and non-destructive internal inspections. Hence, C-SAM analyses are conducted within these tests as part of the non-destructive verification of microelectronic components.
- MIL-STD-883 Test Method 2030 “Ultrasonic Inspection of die attach”
- MIL-STD-1580 “Destructive Physical Analysis for Electronic Electromagnetic and Electromechanical Parts”
- 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 For”
- MIL-PRF-49470 Capacitors, Fixed Ceramic Dielectric Switch Mode Power Supply (General Purpose and Temperature Stable) Standard Reliability and High Reliability, General Specification For
Acoustic microscopy is commonly used in the inspection of materials and composites, including those present in the automotive industry. In addition, microelectronics parts are extending their applications within motor vehicles, where they are providing new functionalities and adding value. Some examples are the implementation of cameras, proximity sensors, engine controls and other systems that have to be able to withstand outdoor environmental conditions. With these concerns, non-destructive quality control of EEE parts and materials by acoustic microscopy assures the suitable performance for such applications.
- Control devices
- Power electronics
- Sealing systems
- Welded connections
- Soldered systems
- Sintered layers
- Compound materials
In addition to assembly issues, scanning acoustic microscopy is also an advantageous non-destructive analysis technique for the characterization of bulk materials. In fact, it is particularly effective for the detection of micrometric air defects (voids in the figure) even within low-density materials (plastics and mold compounds) or for the inspection of x-ray opaque system (e.g. metals). The image shows the detection of voids within a ceramic capacitor.
- Ceramic and sintered materials.
- Composites and hybrid materials
- Si ingots and wafers
- Bonded and molded plastics
- Hard Metals