Upload
semiconsoft-inc
View
80
Download
5
Embed Size (px)
DESCRIPTION
Direct measurement of the coating on the PCBA, eliminates the need to test coupons and improves the fidelity/accuracy fo the measurement. MProbe 40 (MSP) is used to measure coating thickness directly on the PCBA product http://www.semiconsoft.com/wp/mprobe-40-microscope/
Citation preview
83 Pine Hill Rd. Southborough, MA 01772 Phone +1.617.388.6832 Fax. +1.508.858.5473
email: [email protected] http://www.semiconsoft.com
Thin Film Measurement solution Software, sensors, custom development and integration
Measurement of PCBA coatings Summary.
During PCBA manufacturing conformal protective coating is customary applied to protect the circuit. Different coating is applied depending on specification requirements. The coating range from a simple water soluble dust protection (typically, < 20μm) to specialized hydrophobic coatings (<1 μm). MProbe 40 enables measurement of the coating thickness directly on the PCBA to avoid cost and inaccuracy of using test coupons. The measurement can be done on different areas of the PCBA, including on SMT elements surface to verify uniformity and thickness of the coating. The measurement is, typically, done using 40 μm or 20 μm measurement spot in the Visible or Vis-NIR range (400-1000 nm). Example 1. Measuring water soluble coating on PCB surface
Fig. 1 Reflectance spectrum of the coated PCB
83 Pine Hill Rd. Southborough, MA 01772 Phone +1.617.388.6832 Fax. +1.508.858.5473
email: [email protected] http://www.semiconsoft.com
Fig.2 PCB Measurement area
Fig. 3 Measurement result: 15µm coating layer and 1.5 µm interface layer.
83 Pine Hill Rd. Southborough, MA 01772 Phone +1.617.388.6832 Fax. +1.508.858.5473
email: [email protected] http://www.semiconsoft.com
Fig. 4 Measurement area (silicon area gray square) on the PCB
Fig. 5 Measurement result (area Fig. 4): Layer thickness 16.7µm and 1.5 µm interface layer.
83 Pine Hill Rd. Southborough, MA 01772 Phone +1.617.388.6832 Fax. +1.508.858.5473
email: [email protected] http://www.semiconsoft.com
Example 2: Measuring hydrophobic coating on PCBA
Fig. 6 Measurement location.
Fig. 7 Measurement spot (Fig. 6) at 20x magnification
83 Pine Hill Rd. Southborough, MA 01772 Phone +1.617.388.6832 Fax. +1.508.858.5473
email: [email protected]
Fig. 8 . Results of the measurement: layer thickness 535 nm
http://www.semiconsoft.com