Material - Phosphor-Bronze
material is designed to satisfy the EMI requirements as
well as the strength of the material.
an alloy patented by two Belgian metallurgists in the 1870s,
and now is extensively used where toughness and resistance
to wear are required. The amount of phosphorus in phosphor-bronze
is less than 1 per cent and the effect it produces is probably
due to its reducing action on the oxides of the other metals
during the process of manufacture. Phosphor-bronze is of
finer grain and color, and is believed to be much more durable,
than ordinary bronze.
Bronze is preferred to stainless steel for two reasons;
1. Phosphor Bronze has natural lubrication properties. Phosphor
bronze has been used for many years in producing connectors
and one reason is to reduce wear on the connector. Phosphor
Bronze has a natural grease to it which helps provide easy
of insertion of the male plug into the connectors. Stainless
steel connector shells require to have another material
introduced and mixed with it, otherwise they will wear much
more quickly. The insertion cycles of all connectors are
measured by the number of times the male connector is plugging
and unplugging into the female connector. Studies have shown
the Phosphor Bronze has a better number of cycles than stainless
2. Phosphor Bronze is an exact material related to all the
EMI (Electromagnetic emissions) issues of connectors and
designs of components and connectors used on printed circuit
designing high reliability connectors, it all comes down
to shielding and, in turn, EMI/RFI protection. Manufacturers
of networking and computer equipment place emphasis on shielding
and low insertion losses due to greater demands for high
speed transmission. Materials as well as filtering of the
connector both play a key role in shielding to meet EMI/RFI
requirements. Nickel-plating the connector shell and gold-plating
the contacts are just a couple of ways in which insertion
loss and resolution requirements are met. Connector manufacturers
are also increasingly using plating on beryllium copper
and stainless steel, since both materials feature excellent
insertion loss characteristics.
designed with shielding typically satisfy any EMI requirement.
Electromagnetic interference is also reduced through the
connectorˇ¦s capacitance value. Connectors with capacitance
values ranging to 50,000pF significantly reduce signal noise
traveling through the device, thus directly and positively
affecting the performance of the end unit.
EMI/RFI electronic issues have driven connector manufacturers
to develop higher-performance and more cost-effective EMI
suppression filter solutions.