Circuit layout
Trace width, spacing, bend regions and component pads are reviewed from the schematic.
Copper flex circuit integration
FPC Membrane Switches
An FPC membrane switch uses a copper circuit on polyimide where the project needs finer routing, soldered components, robust connector features or electrical capability beyond a typical printed-silver circuit. It is selected from the actual schematic and assembly constraints, not as an automatic upgrade.
Engineering variables
FPC integration decisions
Tail and connector
ZIF contact finish, stiffener, FFC or soldered connector options match the main PCB.
Component mounting
LEDs and selected devices may be assembled directly where the construction allows.
Mechanical transition
The FPC, spacer and overlay stack must avoid stress at folds and exit points.
Decision matrix
Turn the flex circuit into a controlled interface definition.
An FPC membrane switch combines a flexible printed board with the overlay, switching and mounting interfaces around it. A useful quotation separates the OEM's electrical and mechanical intent from the proposed board construction, supply boundary and approval evidence.
| Decision factor | OEM input | Engineering review output |
|---|---|---|
| Electrical function | Provide the current schematic or net list, signal and load conditions, grounding or shielding needs, component interfaces and the functional checks expected at delivery. | Return the proposed circuit architecture, routing questions and test boundary. Conductor capability remains conditional until the stack, layout, components and acceptance method are approved. |
| Flex construction envelope | Identify the board outline, flexible and supported regions, available thickness, mounting features, component keep-outs and the relationship to the overlay and enclosure. | Return the proposed flexible-board type, layer and stiffener boundaries, mechanical transitions and every assumption that still needs customer confirmation. |
| Bend and installed use | Show the installed path and state whether each flex region is formed once during assembly, adjusted during service or repeatedly flexed in operation; include support, motion and environmental conditions. | Return controlled bend and transition zones, keep-outs, strain-support questions and a project-specific sample plan. No universal bend radius or flex-cycle value is inferred from the product family. |
| Tail and connector | Provide the mating connector manufacturer and part number, pin count and assignment, contact side, insertion direction, tail exit and any stiffener or exposed-contact requirement. | Return a controlled tail-end definition tied to the mating part, pinout, orientation, support and assembly method instead of relying on a generic connector label. |
| Components and assembly | Identify LEDs and other approved parts, BOM ownership, source restrictions, mounting orientation, attachment responsibility, thermal constraints and required inspection or functional checks. | Return the proposed supply boundary, approved-source questions, assembly sequence and evidence expected for the delivered interface. Inclusion on a page does not approve a component or process. |
| Qualification and change control | Name any required standard, edition, class or customer method, the representative specimen, acceptance criteria, documentation and the owner of system-level approval. | Return a project validation and release basis tied to the tested specimen and controlled revision. A standards reference does not establish HYR, product or finished-equipment compliance. |
IPC-2223 and IPC-6013 provide flexible-board design and performance context. The RFQ must still name the applicable edition, project construction, use condition, specimen, method and acceptance criteria; the standards do not select or approve an HYR FPC membrane-switch design by themselves.
Before the RFQ
Questions that keep the first review useful.
Start with the evidence you have now. Open items stay visible for engineering follow-up instead of becoming silent quotation assumptions.
Can pitch and contact count identify the mating connector?
No. Name the connector manufacturer and part number, contact position, insertion direction, actuator style and the supplier-defined mating-FPC geometry. The tail drawing should also control pin numbering, exposed-contact side, stiffener and insertion edge; pitch and contact count alone can describe incompatible interfaces.
Can the FPC tail route be decided after the PCB and enclosure are frozen?
Only when the installed path has already been checked. Show the tail exit datum, insertion access, supported and bend regions, housing or component interference and any movement during assembly or service. The route must respect both the approved flex construction and the handling requirements of the exact mating connector.
What should the first tail-and-connector sample prove?
Confirm that the controlled tail fits the named mating part, enters and locks as intended, carries the approved pinout, follows a strain-free installed route and passes the agreed board-level functional check. Record the connector, tail drawing and sample revisions so the result is not generalized to another interface.
A useful fit when
Start here if the project has these conditions.
- Dense routing or narrow tails
- Projects requiring ZIF-style interconnection
- Interfaces integrating LEDs or selected components
Limits to resolve
Do not treat a product page as a final specification.
- FPC tooling and construction may not suit every cost target
- Dynamic flexing requires a different design review from static bending
- Electrical limits require the actual copper stack and layout
Prepare the RFQ
What to send for a useful review
You can submit what is available now. Unknown items remain visible for human follow-up rather than being guessed.
- 01
Schematic or net list
- 02
Tail outline and bend constraints
- 03
Connector part or mating specification
- 04
Current, voltage and component requirements
Evidence boundary
Claims follow the approved drawing and the actual evidence holder.
Circuit capability is confirmed against the final FPC design and manufacturing evidence, not inferred from a generic product family.
Technical reference basis
Sources inform the questions. The project drawing controls the answer.
These publisher resources support the decision framework. They do not prove that HYR uses a named grade, holds a listed certification or has approved a project construction.
- IPC / Global Electronics AssociationIPC-2223E — Sectional Design Standard for Flexible/Rigid-Flexible Printed Boards ↗Publication date not stated
Primary standards-body context for flexible-board types, bend areas, strain relief, connector contacts, documentation and quality assurance; it is not evidence that an HYR project complies with the standard.
- IPC / Global Electronics AssociationIPC Board Design Standards ↗Publication date not stated
Primary standards-body context distinguishing the generic printed-board and flexible-board design standards; it does not select a construction, class or acceptance method for a project.
- IPC / Global Electronics AssociationIPC Standards Revision Table ↗Publication date not stated
Primary source for checking the current document revision before an RFQ names IPC-2223 or IPC-6013; a revision listing is not product qualification or certification evidence.
- TE ConnectivityIntroduction to Fine Pitch FPC Connectors ↗Publication date not stated
Primary supplier context for centerline spacing, actuator operation and top, bottom or dual contact orientation; it does not select or approve a connector for an HYR project.
- MolexFFC/FPC Connectors ↗Publication date not stated
Primary supplier context showing that pitch, circuit count, actuator, contact position and board orientation are separate connector choices; it is not evidence that HYR uses or approves a listed series.
- Hirose ElectricFH35C Series Catalog and FPC Handling Precautions ↗Publication date not stated
Primary supplier example linking the recommended FPC geometry, insertion method and strain-free routing to one exact connector series; it is not a universal tail specification or evidence of an HYR project selection.