CHP05-D34-0017 - Stamping and Drawing Charging PIN

CHP05-D34-0017 Copper pillar tail nail

In response to the high-frequency contact of charging contacts in smart wearable devices and TWS Bluetooth earphones, which are highly susceptible to electrolytic corrosion from sweat, as well as the stringent demands of large-scale supply-chain manufacturing on efficiency and BOM costs, Krconn Technology Co., Ltd. has innovatively launched a new generation of core connection components— Integrated Stamping and Stretching Precision Charging PIN ( Model: CHP05-D34-0017 ), This product has now officially entered mass production. The charging contact assembly innovatively employs a high-end, precision continuous‑die stamping and deep‑drawing process, successfully replacing the traditional MIM (metal injection molding) technique across the board. While achieving exponential growth in single‑die production efficiency, it also slashes the underlying material costs by half and incorporates industry‑leading dual‑layer gold (Au) and platinum (Pt) composite plating. This is a core interconnect component designed for next‑generation smart, skin‑friendly hardware—boasting both groundbreaking technological innovation and significant commercial value.

  I. New Product Technical Specifications

(1) Revolutionary Integrated Stamping and Stretching Design (Replacing the MIM Process)

Breaking free from the constraints of conventional MIM (Metal Injection Molding) processes—high energy consumption, multiple processing steps, and complex post‑processing for debinding and sintering—this approach employs an advanced continuous‑die precision stamping‑stretching process, delivering exceptionally impressive industrial‑scale production efficiency. Single‑die daily output can reach as high as 180K/D (180,000 parts per day). Thanks to its remarkably high material utilization and rapid continuous stamping speed, the base material cost can be slashed by up to 50% compared with traditional MIM methods.

(2) Soldering pads of the independent motherboard connector

The product’s base features a dedicated horizontal tab‑type soldering lead that extends to one side, ensuring optimal soldering area and robust mechanical retention when mated with the motherboard connector or SMT pads, thereby withstanding prolonged, repeated, high‑intensity pull‑out forces.

(3) Precision Lateral Ultrasonic Riveting Groove

A precisely molded, recessed ultrasonic riveting groove is formed in the mid‑waist area of the product. During final‑assembly of the complete housing, this feature seamlessly integrates with the ultrasonic welding process, allowing the heated, molten plastic to fully fill the riveting groove. Combined with the anti‑detachment “solder‑catching groove” design at the base (5.00 mm, Ref.), this ensures exceptionally high airtightness and water resistance, as well as superior tensile‑strength and mechanical integrity for the entire assembly.

(4) High-end customized exterior contact surfaces

The正面 exposed contact surface (2.40 mm × 3.44 mm) features a high-precision, continuously drawn, smoothly rounded arc design. The overall profile is exceptionally smooth, richly contoured, and aesthetically pleasing, with absolutely no microscopic burrs or grainy texture. While enhancing the skin-friendly tactile experience of the finished product, it also perfectly meets the customized aesthetic requirements of global key customers for a luxurious, premium exterior appearance.

II. Features and Advantages

(1) Gold + Platinum (White Gold) Dual Composite Electroplating Process

The surface treatment employs an exceptionally rigorous AU 3U” + Pt 15U” (3 microinches of gold plus 15 microinches of platinum) composite plating process. This highly valuable platinum outer coating endows the product with industry‑leading resistance to electrochemical corrosion and to the corrosive effects of skin‑derived acidic and alkaline sweat; at the same time, it offers outstanding biocompatibility, effectively eliminating metal allergies, discoloration or blackening, and electrochemical oxidation‑induced failure that can result from prolonged skin contact at wearable interfaces.

(2) Robust industrial-grade dual pH electrolysis and sweat‑resistance reliability certification  

In addition to passing the rigorous 48-hour continuous high‑concentration salt spray test, this module has also successfully cleared the industry‑leading PH 4.7 weakly acidic electrolyte/sweat test and the PH 9.5 weakly alkaline electrolyte/sweat test. Furthermore, it has flawlessly passed a comprehensive suite of closed‑loop environmental reliability tests, including low‑temperature, electrical resistance, high‑temperature, soldering, thermal shock, temperature rise, damp heat, and biocompatibility assessments.

(3) Efficient and Safe Transmission of High Currents

Thanks to its superior conductive material properties, the product maintains an extremely compact footprint while keeping contact resistance tightly constrained at a maximum of 30 mΩ. It delivers stable, high‑current power transmission up to 2.0 A, with minimal operating temperature rise, fully aligning with the fast‑charging trend.

(4) Rigorously selected ultra-thin, high-precision industrial substrate

High‑performance C2680 brass is carefully selected as the base material, with thickness precisely controlled to an ultra‑thin T = 0.10 ± 0.005 mm, ensuring highly uniform and stable bending and tensile‑stretching properties.

III. Target Market and Applications

(1) High-end TWS Bluetooth earbud charging case and earbuds: A premium charging and signal‑transmission pin specifically designed for the earbud side—where it directly contacts the skin—eliminates green corrosion caused by sweat after prolonged wear.

(II) Smart Wearables and Health‑Care Medical Devices: Smart sports watches, smart wristbands, smart medical-grade monitoring chest patches, health‑focused smart rings, and similar devices require exposed, sweat‑resistant fast‑charging electrodes.

(3) Beauty & Personal Care and Handheld Smart Devices ： Side charging‑base contacts for the housings of portable facial smart beauty devices, electric facial cleansing devices, microcurrent massage devices, as well as handheld network cable locators, smart refractometers, illuminance meters, and other precision instruments.

IV. Product Parameters, Specifications, and Production & Supply Information