Product Overview
Multi-Branch Rigid-Flex PCB with Gold Finger Edge Connector integrates rigid FR-4 sections and polyimide flexible branches into one single circuit, equipped with hard-plated gold finger edge connector on the main rigid area. Multiple independent flexible branches extend from the main board to connect different sub-modules, sensors or components.
It eliminates messy discrete cables and extra connectors, realizes multi-channel distributed interconnection in limited 3D assembly space. The edge gold finger serves as a unified pluggable interface for docking with backplane or main socket, suitable for modular equipment that needs detachable assembly, vibration resistance and compact layout.
Core Advantages
- Multi-branch distributed interconnection：One main board drives multiple flex branches, each branch can be routed separately to different positions, adapt to irregular internal structure of equipment, greatly save internal space.
- Integrated gold finger edge connector：Selective hard gold plating on edge fingers, low contact resistance, anti-oxidation, support repeated plug/unplug cycles, stable high-speed signal and power transmission. No extra connector soldering required at the main interface.
- High anti-vibration & anti-fatigue performance：PI flexible branches adopt RA rolled annealed copper, withstand repeated bending and long-term vibration; rigid-flex transition zone is optimized to reduce stress fracture risk.
- Reduced assembly error & BOM cost：Replace multiple loose FPC harnesses and connectors with one-piece rigid-flex structure, simplify SMT and final assembly, lower the risk of wrong wiring and loose contact.
- Controlled impedance support：Can design differential pair, single-ended 50Ω/100Ω impedance traces on both rigid and flex areas, meet MIPI, LVDS, USB and other high-speed signal requirements.
- Stiffener optional for key zone：FR4/PI stiffener can be added on gold finger and component soldering area, keep flatness during plugging and soldering, avoid pad peeling.
Technical Parameters
| Item | Specification |
|---|---|
| Product Name | Multi-Branch Rigid-Flex PCB with Gold Finger Edge Connector |
| Base Material | Rigid part: FR4 (High Tg optional); Flex part: Polyimide (adhesive / adhesiveless PI) |
| Layer Count | 2L ~ 12L rigid-flex stack-up, custom layout |
| Copper Foil | RA rolled annealed copper 12μm / 18μm / 35μm; ED copper available |
| PI Coverlay | Yellow / Black PI coverlay |
| Gold Finger Finish | Hard electrolytic gold; Ni:2~5μm, Au:0.3μm~1.27μm, 30°~45° chamfer |
| Min Trace / Space | 0.075mm / 0.075mm |
| Min Bend Radius | ≥0.5mm (dynamic bending), ≥0.3mm (static bending) |
| Impedance Tolerance | ±10% standard; ±5% tight tolerance for high-speed signal |
| Operating Temperature | -40℃ ~ +180℃ |
| Flex Bending Life | ≥100,000 cycles (RA copper design) |
| Outline Tolerance | ±0.075mm |
| Compliance | IPC-6013, IPC-2223, RoHS, REACH, UL94 V-0 |
| Special Feature | Multi independent flex branches, one-piece forming, selective gold plating |
Application Scenarios
- Industrial control & test instrument：Modular test cards, multi-sensor acquisition modules, PLC expansion units
- Medical equipment：Minimally invasive probes, portable diagnostic monitors, multi-channel sensing interconnect
- Aerospace & defense：Avionics modular unit, multi-path signal distribution board
- Automotive electronics：ADAS sensor cluster, cockpit multi-display interconnection, BMS sampling module
- High-end consumer & wearable：VR/AR internal multi-sensor connection, foldable display module
- Communication module：Distributed antenna unit, multi-channel RF signal splitting module
