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Board Level EMC Products |
A range of solutions to all on-board screening and suppression needs. A vast range of ferrite suppression products by Steward Inc, covering just about all the possible requirements for differential and common mode SM and thru-hole PCB applications. Ferrite disks can be used to absorb noise from "hot spots" on devices and PCB tracks. Individual areas or whole PCB's can be placed inside a complete shielded can, whilst beryllium copper fingers provide a very low resistance path to earth the PCB to associated metalwork. |
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Steward SM chip bead ferrites Steward provides a full range of chip beads with sizes from 0402 to 1806 and impedance values up to 2,000 ohms. Steward also offers the highest current chip beads in the industry going up to 10 amps in a compact surface mount chip bead. These beads provide excellent retention under bias by minimizing the frequency shift and drop in relative impedance. |
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Steward Common mode ferrite chokes - SM & thru - hole Steward's advanced family of common mode choke arrays provides filtering for both power and data lines all in one part. The product is available from 4 lines up to 8 lines and is effective for power line filtering, USB, Firewire, 10T, 100T, RJ11/45, and Gigabit. Designed to maximize signal integrity. Steward's ultra high current CM chokes provide small form factor, high performance, and economical power filtering for common mode noise in applications up to 55 amps. Multi-line, surface mount filters provide EMI suppression for groups of conductors like power traces and high-speed data lines. Effective filtering into the GHz range. |
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EMI Ferrite Disks and Plates (pdf) Ferrite Disks and Plates provide a simple, cost-effective solution for radiated and inductively-coupled electromagnetic interference. After the PC board soldering process, a ferrite disk or plate can be installed directly on the source of EMI. |
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EMI/RFI shielding laminates A unique range of laminated shields applying selective die cutting technques for cost effective solutions to a variety of shielding problems. Available in a wide range of materials and thicknesses. Many advantages including: Lower cost than spray shielding, effective attenuation, lower tooling and set up costs, insulating capabilities, short lead times & easy prototyping. |
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Shielding cans (pdf) PC board screening cans are used to provide isolation of board level components. There are various types of can and many factors such as application. size, volume, assembly technique, accessibility of components etc will indicate the best can suited to a particular application. Photo etched cans can be supplied flat for self folding with etched fold lines or ready folded, they can have solid tops or removable fingered lids for component access. Stamped and pressed cans can be supplied in the same format as photo etched (not self fold) but tooling is more expensive, but the stamping process offers high volume capability with low unit costs. All types of cans can be supplied to suit through hole or surface mount assembly. Internal dividers can be added to most designs. Ventilation and access holes can be incorporated in both lids and fences. Smaller cans can be supplied tape and reeled for automated assembly. |
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Beryllium Copper fingerstock (pdf) Beryllium Copper makes an ideal gasket material due to its high conductivity giving good shielding effectiveness. Excellent spring features and resistance to compression set make them ideal for high cycle applications in both compression and in a wiping action. Various profiles are available to meet design needs and gaps of 0.25 to 10.2mm can be accommodated. Beryllium copper gaskets have a usable deflection of approximately 75% of their height making the larger profiles ideally suited to shield large gaps and take up large tolerance differences. Mounting methods dependent on profile is Clip on, Stick on with double-sided tape, Rivet, Weld, Solder and Slot mount. There are 21 plating finishes available designed to meet galvanic compatibility needs and enhance performance in specific applications. |
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