Description
What is an SMB Connector?
SMB connectors are coaxial RF connectors developed in the 1960s. SMB connectors are smaller than SMA connectors. They feature a snap-on coupling and are available in either 50 Ω or 75 Ω impedance. They offer excellent electrical performance from DC to 4 GHz.
This series includes a snap-on interface, controlled by industry-standard specifications, and is easy to connect and disconnect. Mechanical stability provided by the SMB interface and its relatively small size allows use in applications where space is limited.
Subminiature interconnects featuring snap-on coupling and a space-saving alternative to SMA.
FEATURES
Performance up to 4 GHz
Simple snap-on coupling
RG 174, RG 316, or RG 178 cable terminations
Right-angle through-hole jack
Non-magnetic options available for medical and aerospace applications
Custom SMB jack connector crimped to a 5 mm coaxial cable
Type: RF coaxial connector for Cable Coaxial
Passband Typically 0–4 GHz
SMB (Sub-Miniature version B) connectors are coaxial RF connectors developed in the 1960s. SMB connectors are smaller than SMA connectors.
They feature a snap-on coupling and are available in either 50 Ω or 75 Ω impedance. They offer excellent electrical performance from DC to 4 GHz.
An SMB jack has a male center pin, while an SMB plug has a female basket.
Connectors are available for two SMB cable sizes:
Cable 2.6/50+75 S (3 mm outer / 1.7 mm inner diameter) and
Cable 2/50 S (2.2 mm outer / 1 mm inner diameter)
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| Item NO.: CTRF-CN-SMB-Male
Key Specifications of the SMB Male coaxial cable connector |
|
| Connector Series | SMB |
| Connector Gender | Male |
| Connector Polarity | Standard |
| Connector Angle | Straight |
| Connector Mount Method | None |
| Connector Impedance | 50Ohms |
| Frequency | DC 0-4Ghz |
| V.S.W.R | ≤1.3 |
| Voltage Breakdown | DC1000V/50Hz |
| Insertion Loss | ≤0.1dB/GHz |
| Insulation Resistance | ≥5000MΩ |
| Contact Resistance | Shell≤2.5mΩ; Center Pin≤5mΩ |
| Engagement Force | Insert: Max 2.5KG |
| Separation Force | Extract: Min 0.8KG; Max 4KG |
| Center Pin Retention | ≥30g |
| Mating Cycles | >500 |
| Operation Temperature | -40℃~+65℃ |
| Storage Temperature | -40℃~+80℃ |
| Junction Retention | ≥8KG |
| Color | Golden |
C&T RF SMB CONNECTOR SERIES
The SMB connector is used in applications where a quick mating sub-miniature RF connector is required for RF frequencies up to frequencies of a few GHz.
The SMB connector derives its name as it is termed a Sub-Miniature version B connector. It was developed as a result of the need for a connector that was able to connect and disconnect swiftly. It does not require nuts to be tightened when two connectors are mated. Instead, the connectors are brought together and they snap-fit together. Additionally, the connector utilizes inner contact and overlapping dielectric insulator structures to ensure good connectivity and a constant impedance.
The SMB connector is not as robust as the SMA connector, and although they perform well under moderate levels of vibration, they are not suitable for harsh environmental conditions where the levels of vibration rise.
SMB Connector Impedance
The SMB connector is specified in two impedances:
50Ω: The 50Ω version of the SMB connector is possibly more widely used. The connectors are often specified up to 4 GHz.
75Ω: The 75Ω version of the SMB connector is often only specified to a maximum frequency of 2 GHz, although 4 GHz versions are available. To achieve the different impedance the ratio of the inner to outer diameters is different
The connectors are available in variants for the different types of thin coax available. The cable entry areas need to be able to accurately accommodate the coax cable.
RF Connector Applications
SMB coaxial connectors are not as widely used as their SMA counterparts. They are used for inter-board or assembly connections within the equipment, although they are not widely used for purchased microwave assemblies in view of their inferior performance.
Applications for SMB connectors can include:
Base Stations
Antennas
Radio Boards
PC/LAN
GPS
Although the SMB connector is not as widely used as its SMA cousin, large quantities are nevertheless used. The connector is much easier to connect and this can be a distinct advantage in applications where its performance is sufficiently good.
As a result, the SMB connector is a very successful design and is used for many applications.
SMB connectors from C&T RF Antennas Inc. are part of the very extensive selection of radio frequency interconnect components. C&T RF Antennas Inc’s SMB connectors include jack and plug genders in 50 Ohm impedance levels. Our SMB connectors are available in standard polarity designs with bulkhead and mountless types.
The SMB connector product line for coax and PCB is available with various crimp/solder, solder, and solder/solder attachment methods. SMB connector-compatible cable types include RG174, RG316, and RG405.
What is the difference between the SMA connector and the SMB connector?
SMA series radio frequency coaxial connector is a small radio frequency coaxial connector with screw connection, characteristic impedance 50-ohm female, frequency range 0-12GHz.
It is widely used in telecommunications, networks, wireless communications, testing and measuring instruments, microwave communications, aerospace and navigation, weapon systems, microwave measurement equipment, and other fields.
The SMB connector is a small push-in RF coaxial connector developed and produced according to the MIL-C-39012 standard. The characteristic impedance is 50 ohms and 75 ohms, and the frequency range is 0-4GHz.
Many people do not know the specific difference between the SMA connector and the SMB connector, and even confuse the two when purchasing. In fact, there are three main differences between them.
1. Impedance
The impedance of the two connectors is different. The SMA connector is only 50 ohms, and the SMB connector should be selected when 75-ohm resistance is required.
2. Different shapes
Although the appearance of both SMA and SMB can be customized according to their own needs, in order to avoid confusion, they will deliberately avoid producing connectors of the same shape during production. Therefore, the appearance of the two will be different.
3. Different calibers
Because the connection method and interface structure are different, the caliber of SMA and SMB are different. Therefore, only the same model can be used for mutual matching. Different models need adapters.
C&T RF Antennas Inc’s SMA connector SMB connector has the advantages of small size, lightweight, convenient use, fast insertion and removal, low line loss, wide frequency band, superior mechanical and electrical performance, and high reliability.
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