Uniwell Circuits immersion tin hearing aids multilayer rigid-flex PCB

Structural and spatial optimization: The rigid area uses FR-4 substrate to carry chips and dense solder pads, while the flexible area can be freely bent and wired. Compared with traditional fully rigid printed circuit boards, it can reduce equipment volume by about 40% and weight by 30%, perfectly adapting to the narrow cavity space of hearing aids.
High density interconnection capability: Supports HDI micro hole technology, with a minimum line width/spacing of up to 3/3mil and a pad density exceeding 130 dots/in ². It can complete the wiring layout of complex circuits such as hearing aid audio processing and Bluetooth transmission in a very small area.
Advantages of tin deposition process: By depositing a uniform and dense pure tin layer on the copper surface through chemical reactions, the solderability performance is excellent. Even after multiple reflow soldering and high-temperature and high humidity environment tests, the solder joint can still be guaranteed to be firm, while avoiding the formation of tin whiskers, greatly reducing the risk of short circuit in long-term use of hearing aids.
High reliability performance: The integrated rigid flex design reduces the use of connectors by more than 60%, eliminates the connection failure points of traditional split circuits, can pass 100000 dynamic bending tests, and has a temperature resistance range of -55 ℃ to 125 ℃, suitable for the complex environment of daily wearing of hearing aids.

In ear hearing aids: The flexible part can be bent and wired along the curvature of the ear canal, without the need for additional connectors, greatly reducing the size of the hearing aid and achieving a more concealed wearing effect.
Intelligent hearing aid with Bluetooth function: The rigid zone carries the audio processing chip and Bluetooth module, while the flexible zone is responsible for cross regional signal connection. The impedance control accuracy reaches ± 5 Ω, ensuring clear and stable audio signal transmission and reducing electromagnetic interference.
Implantable hearing aid medical device: The integrated high reliability structure reduces circuit failure points, and the excellent protective performance of the tin deposition layer delays copper surface oxidation and corrosion, extending the service life of the device in the human environment.