With the increasing proliferation of wireless devices, designers are challenged with various electromagnetic waves from multiple sources radiating at the same spectrum of frequencies resulting in electromagnetic interference(EMI). Radio-frequency(RF) emitting devices require effective isolation to limit the propagation of their interference to neighboring components to protect the end device from performance degradation. As electronics move toward miniaturization, lighter weight, and higher speeds, these challenges become more significant as conventional shielding methods present functional and operational limitations. To address this, the Faraday cage is applied at the package level.
Typical Packaging Structure and Solutions
Henkel has developed innovative material technologies that provide effective protection at the package level with compartmental shielding and conformal shielding using simple and scalable processes.
Conformal Shielding Materials
The thinly spray-coated material provides uniform coverage on top and sidewalls, clean edges without backside contamination, and excellent adhesion to mold compound with excellent Shielding Effectiveness (SE). Furthermore, this technology is simple allowing easy production scalability and design flexibility with minimal cost of ownership using spray-coating compared to other costly methods such as PVD/sputtering.
Advantages of Spraying with Henkel Material
Henkel Material vs. Conventional Conductive Ink
|Key Requirements||PVD/Sputtering||Spraying (with Henkel)|
|Total Cost of Ownership||Extremely high||Up to 60% lower|
|Throughput (UPH)||Moderate||Up to 400% higher|
|Required CAPEX||Extremely high||Up to 90% lower|
|Required Coating Thickness||3~6 um||3~6 um|
|Laser Mark Visibility||Good||Good|
|Coating Structure||Multi-Layer||Single or Multi-Layer|
|Top:Sidewall Thickness Ratio||1:0.4~0.5||1:0.5~0.6|
|Key Requirements||Conventional Material||Henkel Material|
|Spray Technology Compatibility||Agnostic||Agnostic|
|Bulk Shielding Effectiveness||Poor (50 dB)||Excellent (90 dB)|
|Required Coating Thickness||10~20 um||3~6 um|
|Capable Coating Thickness||10~30 um||3~30 um|
|Silver Settlement During Spray||Yes||No|
|Adhesion to EMC||5B||5B|