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How to select connector
2020-06-01 4736 Author:STC Tag:connector

⒈Based on the communications gear that you are designing:

Wireless Base stations

Carrier Rack Equipment

Chassis, Set Top Box. NIC Card

Selection guides will direct you to select your proverb ased on the performance and mechanical. Requirements such as Impedance, VSWR, max frequency, power handling, etc.


Radio base station cabinets demand to transmit high power RF signals .high speed digital signals, and analog signals. The input/output connections of cabinets are provided by N Series and 7/16 connectors. Plug in RF modules require Blind Mate(BMA),DIN inserts(MARCONI) and panel connectors. Transceiver modules utilize MCX, SMT, and board and cable connectors for board to board and panel to board applications. Finally, semi-rigid and flexible RG cable assemblies can be used to connect signals throughout the entire cabinet.


  For today’s fast paced Carrier Equipment market, we offers a broad line of RF interconnect products that meet requirements for CATV, telecom and data transmission applicator tooling are available for applications ranging from 50Ω to 75Ω,from base equipment to set top boxes. Styles range from standard miniature RF connectors such as BNC and TNC to subminiature RF connectors such as SMA, SMB, SMC and SSMA, SSMB, Blind Mate connectors (BMA), to Micro miniature MMCX. Between Series adapters are available, along with connectors meeting international DIN and IEC standard interfaces, and high performance GHz range BNC connectors meet the needs for faster signaling.


The market of Coaxial interconnectors have developed very fast over these years. The BNC interfaces have a large application in the Ethernet which provide high speed access to the carrier infrastructure. In today’s environment, Network Interface Cards (NIC) still feature Capacitively Decoupled BNC connectors with built-in chip capacitors to reduce noise and ground loop currents. For the infrastructure, the standard coaxial interfaces to the infrastructure include both 50 and 75 ohm BNC connectors. The BNC family features numerous styles including cable plugs and jacks, adapters and printed circuit board connectors. Recently, the SMB interface is the one of choice for improving density and is used in both commercial and MIL-type.

In addition, our portfolio has a wide variety of configurations to meet your system requirements.

⒉There are another guide to help you find the right connection:

  A table of contents listed by interface type, a complete connector type selector describes each interface with typical applications, and a mini-selection guide shows key parameters to quickly pinpoint the right connector type.

DIN1.0/2.3 coaxial connector series according to the DIN 47297-c and CECC22230 standards, have been conceived for use one the compact structures used in modern transmission techniques, and for high performance/high reliability applications are made possible by the quality of the materials used during manufacturing.

1.6/5.6 coaxial connectors series according to the DIN 47295 and CECC 22240 standards. It meets the requirements of high performance and reliability telephone transmission and communication techniques.

The 1.6/5.6 connector series provide 4 types of coupling depending on their use:

A Screwed Coupling

B Snap on Coupling

C Slide-on Coupling

D Push-pull self-latching

The coupling thread of Screwed Coupling type is M9×0.5 threads, so it is be called L9 series. The L9 series have excellent performance, better strength, reliable connector, and strong canker-resistant and so it is used widely.

7/16 Series connectors are designed for medium to high power applications such as cellular base stations, control components, antenna and broadcast. The 7/16 Series minimizes intermediations distortion by silver plating the electrical path. Combined hex/knurl coupling nuts allow for manual or torque tightening, and strong butt joint also reduces signal distortion.

Series threaded connectors have an air dielectric interface and are low cost. These connectors operate to 11GHz and commonly used in cable-based local-area net –works (LAN’s) medium power transmitters, and base station antenna applications.

BNC connectors offer easy engagement and disengagement using bayonet couplings and overlap-ping dielectrics. They are most useful for frequently coupled and uncoupled RF connections with frequencies below 4 GHz. BNC connectors find applications in flexible networks, instrumentation, and computer peripheral interconnections.

TNC connectors have an interface similar to BNC except for a threaded coupling nut. The tighter fits provided by this screw-on connection improves interface control connectors can operate up to 11GHz. TNC connectors are excellent for mobile unite where topnotch performance is required under vibration.

SMA threaded connectors are widely used in microwave communications. Connectors operate to at least 12.4 GHz on flexible coax cables, and up to 26.5 GHz on semi-rigid coax cables. Crimp-on SMA connectors that operate to 26.5 GHz are available.

SSMA (Sub-SMA) Also be called OSSM. The SSMA series was designed to a size compatible with smaller diameter semi-rigid cable. The coupling thread is 10-36 UNS thread. The SSMA series are produced as smaller version of SMA connectors according to the specifications of IEC169-18 and CECC22140. It was widely used in RF and microwave technology.

SMB The SMB connectors feature a snap coupling for fast connection. A self centering outer spring and over-lapping dielectric allows easy snap-on and excellent performance even in moderate vibration. The SMB is smaller in size than the SMA and excellent where engineers are concerned about circuit miniaturization. Typical application is inter-or intra-broad connection of RF or digital signals. Commercial 50Ω versions operate to 4GHz, and 75Ω versions reach2 GHz.

SSMB The SSMB series are snap-on coupling micro-miniature coaxial connectors which are produced according to the specifications of IEC 169-19 and CECC22170. They have the characteristics of light weight, small size, easy to connect and disconnect, vibration-proof and high reliability, and it is suitable for connecting RF coaxial cables in micro-electronic equipments and instruments.  

SMC (Subminiature C) The SMC series are screw coupling miniature coaxial connector which are produced according to the specifications of MIL-c-39012, IEC 22140.They have the characteristics of light weight, small size and vibration-proof, are especially suitable for connection with RF coaxial cables in electronic equipment and instrument.

BMA These connectors offer easy slide-on connection and require less alignment between the cable and the equipment than other connectors with comparable band width. Blind Mate connectors are widely used as coaxial interconnects between plug-in modules and motherboards when scribed in this catalogue.

MCX connectors offer a high reliability, space saving sub-miniature coaxial cable to cable and cable to board interconnection system. The MCX connectors’ impedance types are applicable up to 6 GHz Slide-on and latching coupling provide for a variety of space-saving installations.

MMCX (Micro mate) The MMCX series are snap-on coupling micro-miniature coaxial connectors which are developed as smaller version of MCX connectors according to the specifications of CECC 22340. They have the characteristics of light weight, small size, vibration-proof and reliable contact, are widely used to connect with RF coaxial cables in the smallest instruments as well as personal communication equipments. Connectors for Digital Distribution Frames (DDF) L9 series﹑C3 (AT&T) series﹑C5 (NEC) series﹑C6 (FUJITSU) series﹑(ERI) series﹑SMZ series are included.

3﹑Coupling Mechanisms

Coupling mechanisms make it possible to mate connector pairs and also determine whether or not the mated pair can meet the specified mechanical and electrical characteristics, such as operating frequency. The following five types of mechanisms are commonly used for the series described.

Screwed Coupling Mechanisms: The coupling mechanism consists of a thread and a coupling nut. Special attention must be paid to the maximum torque permitted and the coupling nut captivation.

The screwed connection is used in series like SMC, SMA, TNC, 7/16, SSMA, CC4 and L9 because the mechanism guarantees the most solid, stationary coupling suited for e.g. Test and measurement, military and telecoms applications.

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