SEM Lab, Inc.

SEM Lab, Inc.

Category: Content
Type: Blog Article

Generated 2 months ago

New blog articles detected

  • Shorted FET

    Electrical continuity tests suggested that the gate was shorted to the drain and the source was intact. SEM analysis revealed a suspected damage site at the end of a gate finger (see below). An elemental dot map at the breakdown site showed some slight disturbance of the aluminum metallization at the site. Voltage contrast imaging […]

  • Dendritic Growth – Shorts on PCBA

    Here is another example of electro-chemical migration that resulted in shorted signals on a printed circuit board assembly. These ECM residues can often be hard to see under an optical microscope because there are optically transparent metal oxides present with very small metallic dendrites. Backscattered electron SEM images show contrast related to atomic number, so […]

SEM Lab, Inc.

Category: Content
Type: Blog Article

Generated 2 months ago

New blog articles detected

  • ECM of PWB Battery Contacts

    ECM (electro-chemical migration) can occur when moisture, voltage bias, and ionic contamination come together, such as was the case for the PWB battery contacts shown in the BSE SEM image below. Elemental analysis suggested that the ECM residues were primarily copper, but also zinc (from brass?) and nickel (from ENIG finish or nickel under-plate on […]

SEM Lab, Inc.

Category: Content
Type: Blog Article

Generated 2 months ago

New blog articles detected

  • Bad Board Design

    Design rules suggest that MLCCs should be placed away from board edges and panel break out zones for reasons illustrated in this example. The MLCC was placed far too close to the breakout feature during the design phase for this product. This is a higher magnification image of the flexure fracture that caused the MLCC […]

SEM Lab, Inc.

Category: Content
Type: Blog Article

Generated 2 months ago

SEM Lab, Inc.

Category: Content
Type: Blog Article

Generated 3 months ago

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