As a professional manufacturer of RF connectors, we are committed to providing global customers with high-quality signal transmission solutions. Below is the standardized technical specification for our 50 Ohm BNC-J3 Straight Male Plug:
Products Description
The 50 Ohm BNC-J3 Straight Male Plug is a straight cable-end male connector specifically designed for 50Ω RF coaxial systems. The "J" designates the male (pin) structure, while the "3" indicates that it is custom-developed for standard coaxial cables with an outer diameter of approximately 5.0mm (such as RG58, SYV50-3, 3D-FB, etc.). This product features a classic Bayonet locking mechanism, offering quick connect/disconnect, secure mating, and excellent vibration resistance. Relying on precision CNC machining and a strict quality control system, we ensure that this connector meets industrial-grade application standards in impedance matching, signal attenuation, and mechanical durability.
Working Principle
This connector operates based on the coaxial transmission line principle. Electrically, the center pin makes precision contact with the center receptacle of the mating female connector, ensuring low-loss transmission of RF signals. The outer metal shells mate tightly to form a complete outer conductor circuit, providing 360° electromagnetic shielding to effectively suppress Electromagnetic Interference (EMI) and signal leakage. Mechanically, the connection is secured by rotating the outer bayonet coupling nut approximately a quarter turn, allowing the internal studs to slide into the L-shaped slots of the mating interface for a quick, secure, and anti-vibration physical lock.
Product Structure
The BNC-J3 Straight Male Plug mainly consists of the following core components:
Outer Conductor (Body): Manufactured from high-quality brass with nickel plating, providing mechanical support, corrosion resistance, and electromagnetic shielding.
Inner Conductor (Pin): Made of high-conductivity copper and gold-plated to minimize contact resistance, enhance high-frequency signal transmission efficiency, and improve oxidation resistance.
Dielectric Insulator: Positioned between the inner and outer conductors, typically utilizing Polytetrafluoroethylene (PTFE) to support the inner conductor, maintain constant characteristic impedance, and provide electrical insulation.
Rear Termination Structure: Designed specifically for the J3 specification, the rear adopts a professional slotted crimp process (with a crimp ferrule) or solder structure to ensure optimal pull-out strength and electrical continuity with cables like RG58.
Product Parameters
Below are the standard electrical and mechanical performance specifications for the BNC-J3 Straight Male Plug:
Characteristic Impedance: 50Ω
Frequency Range: DC ~ 4 GHz
Voltage Standing Wave Ratio (VSWR): ≤ 1.30 @ 3 GHz
Contact Resistance: Inner Conductor ≤ 1.5 mΩ, Outer Conductor ≤ 1.0 mΩ
Insulation Resistance: ≥ 5000 MΩ
Dielectric Withstanding Voltage: 1500 V rms (at sea level)
Mechanical Life: ≥ 500 mating cycles
Operating Temperature Range: -55℃ ~ +155℃
Applicable Cables: RG58, SYV50-3, 3D-FB, and other cables with an outer diameter of approx. 5.0mm
Environmental Compliance: Fully compliant with RoHS / REACH standards
Application Areas
With stable electrical performance and reliable mechanical structure, the BNC-J3 Straight Male Plug is widely used in the following fields:
Test & Measurement Instruments: Serving as standard RF input/output interfaces for oscilloscopes, spectrum analyzers, and signal generators.
Radio Communications: Utilized in wireless transceivers, intercom base stations, repeaters, and microwave communication equipment for RF signal transmission.
Security & Industrial Control: Applied in Closed-Circuit Television (CCTV) systems, industrial automation data acquisition systems, and building automation systems.
Vehicle & Navigation Systems: Used for vehicle radio antennas, GPS/BeiDou navigation systems, and communication modules in logistics vehicles.
Usage Precautions
To ensure the optimal performance and service life of the BNC-J3 connector, please observe the following precautions during installation and operation:
Impedance Matching: Always verify the system impedance requirements. Strictly prohibit mixing 50Ω and 75Ω versions, as this will cause signal reflection and VSWR degradation.
Proper Termination: For crimp-type products, strictly follow our provided stripping dimensions and crimp tooling specifications to ensure a secure rear crimp and prevent cable detachment.
Proper Mating/Unmating: Always grip the bayonet coupling nut to rotate and lock/unlock. Never pull directly on the cable or forcefully twist the connector body to avoid damaging the internal structure.
Interface Cleaning: Inspect and clean the pin and insulator mating faces before connection. Prevent dust, metal shavings, or other foreign objects from causing poor contact or short circuits.
Torque Control: Apply moderate force when locking the bayonet coupling. Excessive force may lead to wear or deformation of the bayonet studs.
Zhenjiang Tongda Electronics Co., Ltd. specializes in RF connector manufacturing, offering flexible services from standard parts to custom solutions. Please visit our website for more product catalogs, and feel free to contact us via email or phone for professional quotations and technical support!
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