2026年8月20日
Can We Use an SMA Connector to Transmit a Clock Signal?
Can we use SMA connector to transmit clock signal? Learn how termination, plating, and retention affect clock edge...
Detailed Product Information
Technical Data & Reference
Structured parameters, material notes, application context and frequently asked questions for engineering and procurement evaluation.
Competitor & Cross-Reference
- Alternative Type
- Intermateable With
- Competitor Part Number
- I-PEX 20878-040T-01 (Plug Housing) / I-PEX 3488-0401 (Shell A & B) / I-PEX 3493-0401 (Lock Cover)
- Mates With
- I-PEX 0.4mm Pitch 40-Pin Micro-Coaxial Board-Mount Receptacle Connectors (Mating Receptacle for I-PEX 20878 Series)
Intermateable: This part is mechanically and electrically compatible for mating with the listed competitor connector. Mixed use in the same connector system is supported.
Technical Specifications
- Cable Assembly Type
- High-Speed 0.4mm Pitch 40-Pin Shielded Micro-Coaxial Cable Assembly (FPGA-RF / LVDS)
- Connector Housing (P1 & P2)
- I-PEX 20878-040T-01 (or Equivalent), 40-Pin, 0.4mm Pitch, Black LCP (Qty: 2)
- Shielding Shell & Lock
- I-PEX 3488-0401 Shell-A & B (Qty: 2) + I-PEX 3493-0401 Lock Cover (Qty: 2)
- Contact Orientation
- P1: Goldfinger Facing Down; P2: Goldfinger Facing Up (1-to-1 Pinout + Shield S-to-S)
- Overall Length
- 60.5 +2.5 / -1.5 mm
- Wire Gauge & Impedance
- 40AWG Micro-Coaxial Blue Cable, 50 Ohms (50Ω)
- Solder Joint Protection
- UV Adhesive Encapsulation at Both P1 & P2 Soldering Points
- Standard Compliance
- RoHS Compliant
Material Composition
| Material | Value / Description |
|---|---|
| Connector Housing Material | Black LCP (Liquid Crystal Polymer), 0.4mm Pitch (I-PEX 20878-040T-01 EQ) |
| Shielding Shell & Lock Cover | Metallic EMI Shielding Shell-A & B (I-PEX 3488-0401 EQ) & Lock Cover (I-PEX 3493-0401 EQ) |
| Coaxial Wire Construction | 40AWG 50Ω Micro-Coaxial Cable, Blue Outer Jacket (Qty: 41) |
| Potting & Strain Relief | UV-Curable Adhesive at Connector Termination Points |
Technical Characteristics
| Characteristic | Value |
|---|---|
| Characteristic Impedance | 50 Ohms (50Ω) |
| Conductor Resistance | < 3 Ohms (<3Ω) Max. |
| Pin Assignment | Direct 1-to-1 Continuity (Pin 1–40 to Pin 1–40) + Shield Ground (S to S) |
| Quality & Electrical Testing | 100% Electrical Test (Open / Short / Continuity) |
| Dimensional Tolerances | Overall Length (Soldering Point to Soldering Point): +2.5 / -1.5 mm |
Application Scenarios
-
FPGA-to-RF Front-End Module High-Speed Signal Interconnects
-
LVDS / eDP High-Resolution LCD & OLED Display Panels
-
Machine Vision Cameras, Gimbal Systems & Drone Payload Imaging
-
Portable Medical Endoscopes & Ultrasonic Diagnostic Probes
-
High-Density Embedded Computing & Industrial Handheld Terminals
Frequently Asked Questions
What components make up the 40-pin 0.4mm pitch connector system on this micro-coaxial cable assembly?
Both P1 and P2 utilize a complete 3-part 0.4mm pitch shielded plug system consisting of an I-PEX 20878-040T-01 black LCP housing, an I-PEX 3488-0401 two-piece metallic EMI shielding shell (Shell-A & B), and an I-PEX 3493-0401 mechanical lock cover (or equivalent) to prevent accidental unmating under vibration.
How are the goldfinger contacts oriented between P1 and P2 for board-to-board routing?
While maintaining a direct 1-to-1 pin assignment (Pins 1–40 and Shield S-to-S), P1 is assembled with the goldfinger contact surface facing down ("Goldfinger the down") and P2 is assembled with the goldfinger surface facing up ("Goldfinger the up"), supporting inverted or stacked PCB mating without twisting the 60.5mm ribbon.
What electrical specifications and strain-relief measures are applied to the 40AWG coaxial terminations?
The assembly uses 50-Ohm 40AWG blue micro-coaxial wires terminated with UV-cured adhesive encapsulation over the soldering points for mechanical strain relief, and every unit is 100% electrically tested to guarantee a conductor resistance below 3 Ohms (<3Ω).
Overview and Application Notes
This custom ultra-fine pitch high-speed micro-coaxial cable assembly (FPGA-RF 40-Pin Shielded Cable) terminates a 0.4mm pitch 40-position I-PEX 20878-040T-01 plug connector on both ends (P1 to P2) at a compact overall length of 60.5mm (+2.5/-1.5mm). Constructed with 40AWG 50-Ohm blue micro-coaxial wires, dual-piece EMI shielding shells (I-PEX 3488-0401), mechanical lock covers (I-PEX 3493-0401), and UV adhesive solder-joint reinforcement, it is engineered for high-frequency LVDS, eDP, and FPGA-to-RF board-to-board signal transmission in space-constrained embedded systems.
Key Features
- Connector & Mechanical Locking System: Dual-ended 0.4mm pitch 40-pin black LCP housings (I-PEX 20878-040T-01 or equivalent) equipped with Shell-A & B EMI shielding covers (I-PEX 3488-0401) and positive mechanical lock bars (I-PEX 3493-0401).
- Controlled 50-Ohm Impedance Wire: Built with ultra-fine 40AWG 50Ω blue micro-coaxial conductors to ensure superior signal integrity, low insertion loss, and minimal crosstalk across high-speed differential and RF channels.
- Reverse Goldfinger Orientation: P1 is configured with the goldfinger contact surface facing down, while P2 is configured with the goldfinger contact surface facing up to accommodate inverted board-to-board mating layouts.
- UV Adhesive Strain Relief: Precision soldering points on both P1 and P2 are encapsulated with UV-cured adhesive to protect delicate 40AWG terminations against vibration and mechanical pull stress.
- 100% Electrical Verification: Every assembly is RoHS compliant and undergoes 100% continuity and electrical testing with a maximum conductor resistance of less than 3 Ohms (<3Ω).
Engineering Specifications & Assembly Guidance
This 40-position shielded harness features a direct 1-to-1 signal pin assignment (Pin 1 to Pin 1 through Pin 40 to Pin 40) alongside full ground/shield continuity (S to S) across the metallic shells. Note the opposing mating orientation between ends: P1 positions the goldfinger contacts downward, whereas P2 positions the goldfinger contacts upward, enabling seamless Z-axis routing between stacked or inverted FPGA and RF daughterboards without twisting the flat micro-coaxial ribbon. Total length is controlled to 60.5 +2.5/-1.5mm measured between the internal soldering reference points.
