FFC/FPC Connectors Selection Guide: Specs, Packages & Top Picks

FFC/FPC Connectors: The Space-Saving Interconnect Nobody Enjoys Specifying

FFC (Flexible Flat Cable) and FPC (Flexible Printed Circuit) connectors solve the same problem: making a high-density, low-profile connection from a rigid PCB to a flexible substrate. You'll find them in every LCD display interface, printer head, laptop hinge, camera module, and battery pack connection.

They're also notorious for being fiddly to assemble, easy to damage, and surprisingly easy to spec incorrectly. The differences between ZIF (Zero Insertion Force), non-ZIF, front-flip, back-flip, upper-contact, and lower-contact actuators sound minor on paper, but the wrong choice means your assembly technician can't physically access the actuator after the board is installed in the enclosure.

Here's how to pick the right one.

FFC vs. FPC: Know the Difference

FFC is a flat ribbon cable with parallel conductors laminated between polyester insulation. It's cheap, standardized (0.5mm and 1.0mm pitches are commodity items), and comes in standard lengths from any cable supplier. Use FFC when you need a simple, straight-line, same-side connection between two PCBs.

FPC is a custom flexible circuit — copper traces etched onto a polyimide substrate, which can have bends, curves, stiffeners, and different terminal configurations at each end. FPCs cost more and have longer lead times (typically 2-3 weeks for prototypes), but they're the only solution when the connection path isn't a straight line or when you need impedance-controlled traces on the flex itself.

Connector Selection Parameters

Pitch directly determines the connector size and minimum PCB real estate:

• 0.3mm: Ultra-fine, used in smartphone cameras and compact modules. Requires precision PCB fabrication and assembly.
• 0.5mm: The standard for display interfaces, camera modules, and general high-density interconnect. The sweet spot for most designs.
• 1.0mm: Larger, more robust. Better for higher current (up to 1A per contact) and more tolerant of misalignment. Common in industrial and automotive applications.
• 1.25mm: Often used for battery connections and power-carrying flex circuits.

Actuator type — this is where most selection mistakes happen:

Front-flip is the default choice for most designs — it's the easiest to operate during assembly and rework. Back-flip matters when there's a component or wall directly behind the connector that would block a front-flip actuator. Slide-lock (like the Hirose FH35 series) is preferred in ultra-slim products (tablets, thin laptops) where there's literally no room for an actuator to swing.

Contact position — upper contact (contacts on top) vs. lower contact (contacts on bottom) vs. dual contact:

• Upper contact: Cable inserts with exposed conductors facing up. Most common.
• Lower contact: Cable inserts with exposed conductors facing down. Use when the FFC approaches from above the PCB.
• Dual contact: Works either way. Premium price, but eliminates orientation mistakes.

If you're not sure about the mechanical approach path, dual-contact connectors (like the Hirose FH34SRJ series) eliminate the risk of getting this wrong, at roughly 20-30% higher cost.

Contact material and plating — phosphor bronze is standard. For high-cycle applications (>30 insertions), look for beryllium copper contacts with gold flash plating. For single-insertion consumer products, tin-plated phosphor bronze is adequate and significantly cheaper.

Recommended Series

• Hirose FH12 — 0.5mm pitch, front-flip, 4-50 positions. The industry standard for FFC/FPC. Widely second-sourced, always in stock, well-documented. If you're not sure what to use, start here.
• Hirose FH34SRJ — 0.5mm pitch, back-flip, dual contact, 4-40 positions. Good for tight enclosures where the connector sits near a wall.
• Hirose FH35 — 0.3mm pitch, slide-lock, 11-61 positions. Ultra-thin (0.9mm height when mated), designed for smartphones and wearables.
• Molex Easy-On 502598 — 0.5mm pitch, back-flip, single contact, 4-60 positions. Cost-competitive alternative to FH12, good availability.
• TE FPC 1.0mm — 1.0mm pitch, front-flip, up to 30 positions. Robust option for industrial designs that don't need 0.5mm density.

Practical Notes

FFC cables add cost and assembly time, but they add reliability compared to hand-soldered discrete wires. When you need more than about 8 signal lines between two boards in a stationary product, an FFC + two connectors usually beats a wire harness on total cost, assembly time, and reliability.

For prototypes, standard-length FFCs (50mm, 100mm, 150mm) with same-side contacts (Type A) are available off-the-shelf from most distributors. For production, you can order custom lengths with the exact stiffener and contact orientation needed — minimum order quantities are typically 1,000 pieces, with no major NRE charge for standard 0.5mm pitch.

When routing an FFC in your enclosure, maintain a minimum bend radius of roughly 3x the cable thickness for dynamic flexing applications and 1x for static (one-time bend during assembly). Sharper bends crack the copper conductors over time.

Find FFC/FPC connectors and compatible cables in stock at partscubeglobal.com/search. For complete BOM sourcing across all your interconnect needs, use the BOM upload tool at partscubeglobal.com.