PJ Headphone Jack-343 Copper Sleeve

A headphone socket is a core signal transmission component that connects audio devices to headphones, widely used in scenarios such as mobile phones, laptops, HiFi players, and professional recording equipment. The mainstream specification is dominated by the 3.5mm universal interface, while some high-end devices are compatible with detachable cable interfaces like MMCX. Its core components mostly adopt tin-phosphorus bronze terminals (e.g., PJ-343 copper sleeve), which ensure low contact resistance (usually ＜10mΩ) and stable performance during long-term plugging and unplugging. Additionally, it features anti-electromagnetic interference capability to prevent audio signal distortion.

To meet global market demands, compliance is crucial — the product must obtain CE certification (complying with LVD electrical safety and EMC anti-interference standards) and meet RoHS environmental requirements, which restrict hazardous substances such as lead and cadmium. Relying on Shenzhen's mature industrial chain, headphone sockets achieve efficient mass production, balancing durability and cost advantages, and have become indispensable basic accessories in the consumer electronics and professional audio fields.

product details

As a manufacturer specializing in the R&D and production of headphone sockets, our PJ-343 Copper Sleeve is a core conductive component tailored for mid-to-high-end headphone sockets. With its precision craftsmanship and high-quality materials, it has become the preferred accessory for consumer electronics and professional audio equipment manufacturers.

The PJ-343 Copper Sleeve is integrally formed using high-purity tin-phosphorus bronze, boasting three core advantages: First, excellent electrical conductivity—its contact resistance is stably controlled below 10mΩ, which minimizes audio signal transmission loss and restores pure sound quality. Second, super durability—it remains structurally intact after 5,000 insertion-extraction tests, with an elastic attenuation rate of less than 5%, far exceeding the industry's basic standard of 3,000 cycles. Third, outstanding corrosion resistance—its surface undergoes multi-layer nickel plating, enabling 500 hours of oxidation and rust resistance in extreme environments with 85% humidity and a temperature range of -20℃ to 85℃, making it suitable for multi-scenario application needs.

In terms of dimensional accuracy, the PJ-343 Copper Sleeve strictly adheres to industry standards, with the inner diameter tolerance controlled within ±0.02mm. It perfectly fits 3.5mm universal headphone plugs, ensuring smooth insertion and extraction without jamming. Meanwhile, it is compatible with the assembly requirements of MMCX detachable-cable headphone sockets, providing customers with flexible product design space.

In terms of compliance, the PJ-343 Copper Sleeve has obtained CE certification (complying with EN 60950-1 electrical safety standards and EN 55022 EMC anti-interference standards) and RoHS 2.0 environmental certification. The content of hazardous substances such as lead, cadmium, and mercury is far below the limit values, fully meeting the access requirements of the European Union, North America, and mainstream domestic markets. Relying on Shenzhen's mature industrial chain, we implement full-process control from raw material selection to finished product inspection and provide customized surface treatment services to help customers enhance the competitiveness of their products.

Whether it is consumer electronics such as mobile phones and laptops, or high-end audio products such as HiFi players and professional recording equipment, the PJ-343 Copper Sleeve can empower headphone sockets with stable performance and serve as a solid backing for the quality of your products.