High Power SMA 905 Connector And SMA 906 Connector

SMA 905 and 906 are F-SMA series connectors, which meet the standard IEC 61754-22. Sometimes we say F-SMA 905 connectors, it refers to the same as SMA 905.

According to IEC 61754-22, there are two types of connectors in F-SMA connector family. One is a precision type for use with silica fibres from categories A1, A2, A3, A4(according to IEC 60793-2); The other type is a modified type for use with large core plastic optical fibers(POF) of type A4 a/A4 d. Simply, one type is for standard fiber core(50um) for telecom applications, the other type is for the large core which is primarily found in high power applications, such as industrial and medical applications.

Here we discuss the SMA 905 connector and SMA 906 connector for high power applications. SMA 905 connector has straight ferrule while SMA 906 connector has step ferrule. This is the main difference between these two types.

SMA 905 Connector

SMA 906 Connector

The SMA 905 connector is a non-contact connector typically used in medical, industrial, and military applications.  The stepped ferrule design of SMA 906 connector allows an alignment sleeve to be used when two SMA 906 connectors are mated, hence the connection loss is lower than SMA 905 connection.

SMA 905 connectors have two types: SMA 905 (Low power)and HPSMA 905(High Power). A metal/ceramic ferrule is held tightly around the cladding of a fibre optic with a polished (or possibly cleaved) end surface. Low power SMA905 connector has a stainless steel ferrule or ceramic ferrule, but since high-power SMA905 connectors are prone to overheating, many have used copper (or copper alloy) instead of steel to utilize the thermal conduction properties of that material.

HPSMA 905 connector with flute

HPSMA 905 connector can be with or without flute(fiber free standing).  The flute prevents dirty from damaging the fiber.