Sensitive electronic circuits need to be fully protected from extraneous Electro–Magnetic and Radio Frequency Interference (EMI and RFI). This has typically been achieved by mounting metal shields or ‘cans’ directly to the PCB to fully shroud the required circuitry. These shields are often attached to the PCB using through–hole solder tails, manually soldered after the main assembly process. Not only is this time–consuming and costly but also, during initial setup and subsequent maintenance it is often necessary to access the circuitry and components under the shields. This requires de–soldering operations in often densely populated areas containing highly sensitive components. As a result, there is a high risk of expensive damage occurring.
Harwin’s solution of using shield retaining clips, supplied in industry–standard Tape & Reel packaging, provide an automatic placement method which is soldered using standard SMT placement equipment. Sheild cans are then fitted during final assembly within seconds, with a simple push-action and can be removed at any time for cleaning and rework. The mechanically robust, simple five-sided box design saves costs when compared to fence and cover style. Manufactured from nickel silver to ensure solid screening.
Shield Cans are available in three different material thicknesses (0.3mm, 0.2mm and 0.15mm) to assist matching to different EMI/RFI characteristics. Clips are supplied in a variety of shapes and sizes for added design flexibility.
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