As RF communication systems continue to evolve toward miniaturization and higher integration, connectors—serving as the critical link for signal transmission—must achieve an optimal balance between compact dimensions and electrical performance.

With years of expertise in RF connector development, Kinghelm has responded to the growing demand for miniature, reliable interconnection solutions by introducing the KH-SSMB-JE SSMB PCB Vertical Male RF Coaxial Connector. Featuring a compact 2.7 mm interface diameter, 50Ω characteristic impedance, and a wide operating frequency range of 0–6 GHz, this connector provides an efficient and reliable solution for high-density, space-constrained RF systems.

Kinghelm KH-SSMB-JE Product Image

1. Product Overview

The KH-SSMB-JE is a precision-designed SSMB series PCB vertical male RF coaxial connector from Kinghelm. It adopts a plug-in mounting structure with an SSMB male interface, a standard 50Ω impedance, and supports a frequency range of DC to 6 GHz. Each unit weighs only 0.98 g and is supplied in bag packaging.

Designed for applications where space efficiency and connection reliability are critical, the KH-SSMB-JE is ideal for scenarios such as compact communication modules, portable test equipment, and automotive electronic systems. Its miniature structure and stable RF performance provide engineers with greater flexibility in system design and PCB layout.

Backed by Kinghelm’s comprehensive quality control system, the product delivers excellent consistency, reliability, and long-term stability for mass production applications.

2. Key Features

Standard SSMB Interface with Vertical Male Structure

The KH-SSMB-JE follows the SSMB interface standard and features a vertical male connector design for accurate mating with corresponding female sockets.

The plug-in structure ensures reliable mechanical connection while simplifying assembly procedures, reducing installation complexity and improving production efficiency.

PCB Through-Hole Mounting for Secure Board-Level Applications

The connector adopts a through-hole (DIP) mounting design, allowing the pins to be directly inserted into PCB holes and soldered securely.

Compared with surface-mount solutions, the through-hole structure provides stronger mechanical strength and better resistance to vibration and shock, making it suitable for industrial and automotive applications.

Wideband Performance from DC to 6 GHz

The KH-SSMB-JE maintains stable electrical performance across a broad frequency range of DC to 6 GHz, covering various applications including wireless communication, IoT devices, industrial RF systems, and test equipment.

Its wide frequency capability enables one connector model to support multiple RF platforms, helping reduce component complexity and inventory costs.

Standard 50Ω Characteristic Impedance

The 50Ω impedance standard is widely adopted in RF systems. The KH-SSMB-JE maintains impedance continuity throughout the signal path, minimizing reflection loss and ensuring excellent signal integrity.

This makes it suitable for high-frequency signal transmission where stable RF performance is essential.

Precision Pin Design for Reliable Connection

The connector features precisely positioned pins that align accurately with PCB mounting holes. After soldering, the connector maintains excellent vertical alignment with the PCB surface.

This design helps reduce mechanical stress, prevent poor contact caused by pin misalignment, and improve long-term connection reliability.

Ultra-Compact 2.7 mm Interface Diameter

With an interface diameter of only 2.7 mm, the KH-SSMB-JE achieves outstanding miniaturization while maintaining reliable RF performance.

Its compact footprint allows integration into space-limited devices and provides greater flexibility for high-density PCB layouts.

Full Metal Construction for Mechanical and Electrical Performance

The connector features an all-metal structure, providing excellent mechanical strength and resistance to deformation.

The metal housing also offers enhanced electromagnetic shielding, effectively reducing external interference and ensuring clean, stable RF signal transmission.

3. Product Advantages

Exceptional Space Efficiency for High-Density Designs

As RF systems continue to become smaller and more integrated, every millimeter of PCB space becomes increasingly valuable.

With its 2.7 mm compact interface diameter and ultra-lightweight 0.98 g design, the KH-SSMB-JE significantly reduces connector footprint while maintaining reliable RF performance.

For multi-channel and high-density circuit designs, this compact connector enables more RF channels to be integrated within the same PCB area, or frees additional space for other critical components, helping engineers achieve higher system integration.

Wideband Capability for Consistent RF Performance

Supporting a frequency range of DC to 6 GHz, the KH-SSMB-JE provides stable transmission performance across a wide variety of RF applications.

From Sub-GHz IoT communication and 5G sub-6GHz systems to GPS/BeiDou navigation and Wi-Fi connectivity, this connector delivers reliable signal transmission across multiple frequency bands.

For manufacturers developing products across different RF platforms, one connector solution can support multiple applications, simplifying supply chain management and reducing component selection complexity.

Robust Through-Hole Mounting with Excellent Vibration Resistance

The combination of a through-hole mounting structure and all-metal housing gives the KH-SSMB-JE outstanding mechanical stability.

Compared with surface-mount alternatives, through-hole mounting provides stronger resistance against pulling force, shear stress, and mechanical shock. This makes it especially suitable for applications exposed to vibration, such as automotive electronics, industrial equipment, and outdoor communication systems.

Precision Pin Alignment for High Production Consistency

The precisely engineered pin structure ensures accurate positioning during PCB assembly, improving installation efficiency and production yield.

For manufacturers requiring large-scale production, consistent connector dimensions and reliable quality control contribute directly to improved manufacturing efficiency and reduced failure rates.

Reliable Quality and Professional Support from Kinghelm

As a standard product in Kinghelm’s RF connector portfolio, the KH-SSMB-JE benefits from strict quality management, mature manufacturing processes, and stable supply capabilities.

Customers receive not only a high-performance RF connector, but also professional support throughout product selection, technical consultation, and application development.

4. Typical Applications

Communication Equipment

In compact base stations, distributed antenna systems (DAS), repeaters, and other communication equipment, the KH-SSMB-JE can be used for board-level RF input/output connections and signal interconnections between RF modules.

Its small footprint helps improve channel density and supports more compact communication system designs.

IoT Devices and Smart Terminals

In IoT gateways, smart meters, industrial sensor nodes, and wireless modules, the KH-SSMB-JE provides reliable RF signal transmission between wireless modules and main control boards.

Its miniature size makes it highly compatible with the compact design requirements of low-power IoT products.

Test and Measurement Equipment

Portable spectrum analyzers, signal generators, field strength meters, and other RF test instruments often require compact internal interconnection solutions.

With its small size and wide frequency capability, the KH-SSMB-JE is an ideal choice for internal RF signal routing in space-limited measurement equipment.

Automotive Electronics

Automotive RF systems such as T-BOX modules, smart antennas, and ADAS radar units require connectors with high reliability and vibration resistance.

The KH-SSMB-JE’s through-hole mounting design provides stable mechanical performance under complex automotive operating conditions, ensuring continuous and reliable signal transmission.

Satellite Navigation and Positioning Systems

GPS, BeiDou, and GLONASS multi-mode navigation modules require compact RF connectors with excellent signal integrity.

With its 50Ω impedance design and wide frequency response, the KH-SSMB-JE effectively meets the transmission requirements of satellite navigation applications.

5. Usage Considerations

Soldering Temperature and Time Control

During PCB assembly, recommended soldering processes should be followed to prevent excessive heat exposure that may affect insulation performance or cause mechanical deformation.

The soldering temperature should generally not exceed 260°C, and the heating duration should be controlled within 5 seconds.

Mating and Unmating Operation

The SSMB interface is designed with specified mating cycle performance. Excessive or improper insertion and removal should be avoided to prevent contact wear or mechanical damage.

During installation, ensure proper alignment and avoid angled insertion that may deform the connector pins.

PCB Layout Compatibility

When designing the PCB, customers should follow Kinghelm’s recommended specifications for mounting hole diameter, spacing, and layout requirements.

Proper PCB matching ensures secure soldering, smooth assembly, and reliable mechanical performance.

Environmental Protection

The KH-SSMB-JE is not a waterproof or dustproof connector.

For outdoor or high-humidity environments, additional system-level protection should be implemented to prevent moisture and dust from affecting electrical performance.

Storage Conditions

The product should be stored in a normal temperature and humidity environment free from corrosive gases.

Long-term exposure to high temperature, high humidity, or chemical contamination should be avoided to prevent oxidation of contacts and damage to surface plating.

Kinghelm KH-SSMB-JE Specification

6. Conclusion

As RF systems continue moving toward higher integration, smaller form factors, and increased channel density, the KH-SSMB-JE SSMB PCB Vertical Male RF Coaxial Connector provides an ideal solution combining compact design, reliable electrical performance, and robust mechanical stability.

With its 2.7 mm miniature interface, DC–6 GHz wideband capability, 50Ω impedance, and durable metal construction, the KH-SSMB-JE represents Kinghelm’s expertise and innovation in miniature RF interconnection technology.

For communication equipment manufacturers, IoT solution providers, automotive electronics developers, and test & measurement companies, selecting the KH-SSMB-JE means achieving an optimized balance between space utilization and RF performance.

From improving PCB layout flexibility and production efficiency to ensuring long-term operational reliability, this connector delivers value throughout the entire product lifecycle.

Kinghelm remains committed to customer-oriented innovation and continuous improvement of its RF connector portfolio. As an important member of the SSMB series, the KH-SSMB-JE works together with Kinghelm’s other RF connector solutions to provide reliable interconnection support for a wide range of industries and help customers build more competitive RF products.

About Kinghelm

Shenzhen Kinghelm Electronics Co., Ltd.（www.kinghelm.net）has technical backbones from Tsinghua University and UESTC, and has introduced overseas returnee professionals. Kinghelm is able to develop highly reliable and high-performance antenna and connector products.KH series products of "Kinghelm" brand include Beidou/GPS antennas, RF adapter connectors, plug connector, electrical data connectors, terminals, and customized vehicle harnesses, industrial / medical connectors, and special antenna connectors."Kinghelm connects world", Kinghelm has grown with the development of China's Beidou industry. Starting from supplying Beidou/GPS dual mode antennas, IPEX terminals, and RF adapter cables for automotive manufacturers, Kinghelm has continuously developed products. Currently, it has a series of WiFi, Bluetooth, NB-loT, LoRa, Zigbee, UWB, and GSM antennas, RFID tags, RF adapter cables, standard microwave antennas, vehicle grade SMA, SMB, FAKRA holders, coaxial cables, and can customize non-standard antenna connectors based on customer drawings or samples.

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