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EMI cage performs double duty

Posted: 09 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:datamate products? methode electronics? emi cage? transceiver?

Dual port SFP EMI cagedataMate Products, a division of Methode Electronics Inc., has introduced its rugged, dual port, small form-factor pluggable (SFP) EMI cage with dual transceiver hosting and electromagnetic interference (EMI) protection for both copper and optical SFP transceivers for Fiber Channel, Gigabit Ethernet and Infiniband applications.

The dual port SFP EMI cage with a unique two-piece hybrid design combines the strength of a die cast body with the required spring features of a stamped piece. The die cast body is robust to ensure the structural integrity of its walls and top, and it provides the port-to-port spacing specified in the SFP MSA. The bottom, locking tabs, spring tabs, and press-fit pins are all part of a single stamped piece, designed to reduce inventory and assembly cost. The two ports are mechanically locked and soldered together with Pb-free solder.

Press-fit pins allow the cage to be securely mounted to a printed-circuit board without solder although the cage is solderable, should the application call for it, said the company. Because the dual port SFP EMI cage is fully compatible with the standard MSA footprint, no circuit board modification is required.

These SFP EMI cages can be customized and integrated with value-added features. For instance, lightpipes can be added to the cages to display LED indicators from the host board to the chassis bezel, and conductive elastomers can be used to create a tight seal from the cage assembly to the host bezel to improve EMI performance. Heat sinks can also be integrated with the cage assembly to help dissipate heat from the transceiver. Other multi-port cage configurations are available including 3-port and 4-port modules. The cage is available in RoHS-compliant matte tin or gold-flash plating finishes.

The dual port SFP EMI cage without lightpipes is priced at less than $3.25 in quantities of 10,000. Samples are available from stock.

- Gina Roos

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