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The R&D Philosophy Behind Dongjiang Technology’s J20J Series Connectors with a 0.95 mm Pitch
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Release time:
2026-11-09 18:06
Electrical connectors that use flexible pins as male terminals are increasingly being adopted by users due to their excellent vibration and shock resistance and their suitability for reducing connector size. 2018 In [year], drawing on years of accumulated industry experience, Dongjiang Technology’s senior management and R&D team, after extensive communication with customers, decided to develop a solution that is not covered by either U.S. military standards or Chinese national military standards. 0.95 Signal transmission connectors for spacing. During the R&D process, we gave deep thought to the following questions.
1 , why is the spacing 0.95？
The most widely used on the market is 1.27 spacing's J30J Series connectors, no matter how small they are 0.635 spacing's J63A Series connectors. J63A Because the pitch is too small, it can only be configured in two rows, and users must exercise extreme caution during operation; a moment of carelessness can lead to pin‑shorting failures during mating. However J63A Its structural characteristics are conducive to miniaturization, and industry leaders will J63A The structure is used in J30J On the series connector, keep 1.27 The spacing remains unchanged, forming a new J30JZ The series features an overall reduction in the connector’s mounting footprint, earning high praise from customers. At the time, other manufacturers also introduced similar products. 0.9 Spacing and 1.0 Spacing, but the structure is still subject to J30J The mindset surrounding connectors and non-compliance with imperial standards have led to reduced acceptance.
We also infer the reliability of the twist needle by reverse engineering; after repeated mechanical testing, 3+9 The diameter of the twist needle before it swells is 0.28 The probability of shrinkage is relatively high when the diameter increases to 0.3 At that point, the probability of pin retraction is greatly reduced. Once the diameter of the twisted‑pair pin is determined, try to provide as much clearance as possible between the two contact elements on the insulating mounting plate to ensure insulation performance, while also maintaining the correct width and taper of the socket chamfer. 0.95 The spacing couldn’t be more perfect.
2 Once the spacing is determined, the next step is structural design.
First is anti-misinsertion. We have ruled it out. J63A The half-moon-shaped error-proofing structure, on the one hand, causes misalignment between the mating ends and the overall center, making machining particularly prone to errors and hindering cost control. On the other hand, the profile tolerances of both the male and female mating ends are difficult to manage; moreover, since the manufacturing process requires plating over the interlocking features, this further compromises the final mating accuracy. Ultimately, we still adopted a similar approach... J30J trapezoidal structure, by means of R Adjustment of the angle improves docking accuracy.
Secondly, regarding the mounting method, while continuing to use screw mounting, we have adopted a low-cost housing‑threaded design to prevent screws from backing out. For both the angled‑plug and straight‑plug series, taking into account the maturity of multilayer PCB manufacturing technology, we will no longer offer the end‑tapered pitch configuration, maintaining 0.95 The spacing remains unchanged.
Third is the expansion of core count specifications; we have retained J30J Regarding the series’ core count specifications, it is gratifying that when configured in three or four rows, the overall volume is actually smaller than 0.635 spacing's J63A The series has a greater advantage.
- There’s also an art to naming.
First is the main model designation; we want an intuitive comparison. J30 It needs to be small, and at the same time, it needs to look like J30 That way, a large series was formed, but after searching the industry, it was found that no one else uses it. J20 . In addition, the J-15 at that time -20 The aircraft’s superior performance can readily be associated with high performance and high reliability.
Secondly, regarding model naming, we found that J63A The model number is not intuitive, J30J Since we couldn’t scientifically describe the installation method, we decided to combine the naming strengths of the two major series. For example: J20J-15TJ-JC，15 Indicates the number of cores, TJ Indicates that the needle is attached with a thread end, JC Indicates screw installation.
After the company launched its product, it... 2018 applied for a patent this year, and the patent authorization announcement number is CN208674467U and CN208272180U Subsequently, detailed specifications for its own products were released, and a professional organization conducted comprehensive performance testing and certification. Shortly after launch, the products received high recognition from a broad customer base and are now being procured extensively nationwide. Following use, customers most frequently cited the following two points in their feedback:
First, it boasts high reliability. While reducing its size, it ensures reliable plugging/unplugging and signal transmission, and has now been launched on the market. 8 In recent years, the probability of fatal quality issues has been zero.
Secondly, it feels great to use. One customer commented: “When you hold the plug and socket in your hand and align them for insertion, the fit is just right—neither bulky nor overly delicate. With a satisfying ‘click,’ they snap together perfectly.” Of course, this is also made possible by the company’s sixteen years of accumulated manufacturing expertise and a large array of in-house automated equipment that ensures consistent part quality.
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