USB4 Type-C Receptacle 24 Pin Single Row for 40Gbps High-Speed PCB Applications

The USB4 Type-C connector landscape has evolved rapidly, and the USB-TC24-F30 represents a refined implementation of the 24-pin USB-C form factor optimized for USB4 signaling. This USB4 Type-C receptacle 24 pin is specifically designed to meet the mechanical and electrical demands of high-speed data transmission while maintaining compatibility with legacy USB standards.

Unlike many USB-C connectors that use a dual-row pin arrangement, this connector adopts a single-row SMT configuration. This design choice reduces PCB footprint and simplifies routing, making it particularly attractive for space-constrained applications such as ultra-thin laptops, mini PCs, and portable docking stations. The single-row layout also improves manufacturing yield during automated SMT assembly, as it minimizes the risk of solder bridging between adjacent pins.

From a system-level perspective, the USB-TC24-F30 is fully compatible with USB4 host controllers and retimers, supporting both Gen 2 (10Gbps per lane) and Gen 3 (20Gbps per lane) signaling modes. When paired with a certified USB4 cable, this connector enables aggregate data rates of up to 40Gbps, making it suitable for external GPUs, high-speed storage arrays, and multi-display docking solutions.

This USB4 Type-C receptacle 24 pin is not merely a passive interconnect — it is a critical enabler of modern system architectures that demand high bandwidth, low latency, and robust signal integrity. Whether you are designing a next-generation AI edge computer or a professional-grade docking station, this connector provides the electrical and mechanical foundation required for reliable USB4 operation.

The following table provides complete electrical, mechanical, and environmental specifications for this 24 pin USB-C receptacle. All parameters are validated under standard test conditions per USB-IF and industry reliability standards.

As a USB Type-C 24 pin SMT connector, the USB-TC24-F30 is purpose-built to unlock the full potential of the USB4 specification. USB4 represents a paradigm shift in connectivity, combining high-speed data transfer, video output, and power delivery over a single reversible connector. Here is how this connector enables USB4 performance:

40 Gbps Aggregate Bandwidth

USB4 utilizes two lanes of high-speed differential signaling, each capable of operating at 10 Gbps (Gen 2) or 20 Gbps (Gen 3). The USB-TC24-F30 is designed with controlled differential impedance (90 Ω ± 10%) and low insertion loss (< 0.5 dB at 10 GHz) to support these signaling rates. When paired with a USB4-certified cable and host controller, this USB Type-C 24 pin SMT connector delivers a total bandwidth of 40 Gbps — sufficient for 8K video streaming, high-speed data backups, and external GPU computing.

DisplayPort Alt Mode Support

USB4 natively incorporates DisplayPort 1.4a (and later DP 2.0) Alt Mode, enabling video output over the same USB-C connection. The USB-TC24-F30 supports DP Alt Mode signaling, making it an ideal choice for docking stations, monitors, and AI edge devices that require simultaneous high-speed data and video transmission. The connector’s shielding and contact design minimize crosstalk between data and video signals.

USB Power Delivery (PD) Integration

The 24-pin configuration includes dedicated pins for power and ground, supporting USB PD up to 240W (48V/5A) with appropriate cable and controller selection. The high-conductivity copper contacts ensure minimal voltage drop under load, while the robust SUS304 shell provides reliable shielding for power delivery circuits.

Backward Compatibility with USB 3.2 / 2.0

This USB Type-C 24 pin SMT connector is fully backward compatible with USB 3.2 Gen 1 (5 Gbps), Gen 2 (10 Gbps), and USB 2.0 (480 Mbps) devices. The 24-pin receptacle includes the SuperSpeed differential pairs, USB 2.0 data lines (D+/D−), and configuration channel (CC) pins required for legacy support. This ensures seamless interoperability with existing USB peripherals while providing a migration path to USB4.

Signal Integrity Optimized Design

To maintain signal integrity at 40 Gbps, the USB-TC24-F30 incorporates several design features: controlled dielectric constant (Dk) of the LCP housing, optimized contact geometry, and a shielded shell that reduces electromagnetic interference (EMI). These features work together to maintain eye diagram margin and reduce bit error rate (BER) in high-speed USB4 systems.

Technical Note: The connector itself supports USB4 40 Gbps signaling, but the final system data rate depends on the host controller, cable quality, PCB layout, and overall system design. For optimal performance, follow the PCB design guidelines provided in the PCB Design Considerations section below.

The USB-TC24-F30 is built from three carefully selected materials, each contributing to the connector’s performance, reliability, and manufacturability. Understanding these material choices helps engineers select the right interconnect for their application.

High Conductive Copper Contacts

Contact performance is the single most important factor affecting signal integrity in high-speed connectors. The USB-TC24-F30 uses a high-conductivity copper alloy (CuCrZr or similar) with a gold-plated finish. Key advantages include:

• Low Contact Resistance: < 30 mΩ initial, ensuring minimal signal loss and voltage drop.
• High Conductivity: ≥ 80% IACS (International Annealed Copper Standard), reducing heat generation at high currents.
• Gold Plating: Provides oxidation resistance, stable contact interface, and supports 10,000+ mating cycles.
• Spring Retention: The copper alloy maintains spring force over temperature and mechanical cycling, ensuring consistent contact pressure.

SUS304 Stainless Steel Shell

The one-piece outer shell is fabricated from SUS304 stainless steel, a material widely used in electronic connectors for its combination of strength, corrosion resistance, and formability. Benefits include:

• EMI/RFI Shielding: The conductive shell provides a continuous shield that attenuates electromagnetic interference, critical for USB4’s high-frequency signals.
• Corrosion Resistance: SUS304 withstands humidity, salt spray, and industrial atmospheres, making it suitable for medical and industrial applications.
• Mechanical Strength: The shell resists deformation during cable insertion and extraction, maintaining connector geometry over thousands of cycles.
• Grounding: The shell provides a low-impedance ground path, improving ESD protection and system noise immunity.

LCP High Temperature Housing

Liquid Crystal Polymer (LCP) is the housing material of choice for high-speed SMT connectors. Its properties are particularly well-suited to USB4 applications:

• High Temperature Resistance: Withstands 260°C peak reflow temperatures, compatible with lead-free soldering profiles.
• Dimensional Stability: Low coefficient of thermal expansion (CTE) ensures pin coplanarity and alignment through the soldering process.
• Low Dielectric Constant: Dk ≈ 3.0–3.5 at high frequencies, minimizing signal propagation delay and maintaining impedance control.
• Low Moisture Absorption: < 0.1% absorption prevents blistering during reflow and maintains electrical properties in humid environments.
• UL 94V-0 Flammability Rating: Meets safety requirements for consumer and industrial electronics.

Together, these three materials — high-conductivity copper, SUS304 stainless steel, and LCP — create a connector that balances electrical performance, mechanical durability, and manufacturing compatibility. This material combination is validated through extensive reliability testing, including thermal shock, humidity exposure, and mechanical cycling per EIA-364 standards.

Designing a PCB for USB4 40 Gbps operation requires careful attention to layout, impedance control, and grounding. The following guidelines are recommended when using the USB-TC24-F30 or any USB4 Type-C receptacle 24 pin in high-speed applications.

Keep-Out Area & Component Placement

Ensure a keep-out zone around the connector footprint to avoid interference from adjacent components. Allow at least 2 mm clearance on all sides for reflow soldering and inspection. Place the connector near the PCB edge to minimize cable overhang and mechanical stress. For horizontal (right-angle) mounting, the connector body should extend beyond the PCB edge per the mechanical drawing.

Ground Connection & Return Path

Provide a low-impedance ground connection for the connector’s shell and shield tabs. Use multiple ground vias (at least 4–6 vias) placed close to the shield solder tabs to minimize ground inductance. The ground plane should be continuous beneath the connector area, with no splits or slots that could create impedance discontinuities.

Shield Solder Tabs

The USB-TC24-F30 includes shield solder tabs on both sides. Solder these tabs to the PCB ground plane using a thermal relief pattern to balance solderability and heat dissipation. Ensure the solder pads are sized according to the manufacturer’s footprint recommendations to avoid tombstoning or insufficient wetting.

Differential Pair Routing

Route USB4 SuperSpeed differential pairs (Tx1+/Tx1−, Tx2+/Tx2−, Rx1+/Rx1−, Rx2+/Rx2−) with controlled differential impedance of 90 Ω ± 10%. Maintain consistent trace spacing (S) and width (W) throughout the routing path. Use ground stitching vias alongside differential pairs to provide a continuous return path and reduce crosstalk. Keep trace length mismatches within the pair below 0.5 mm (5 mils) to maintain skew tolerance.

ESD Protection

Place ESD protection devices (e.g., TVS diodes) as close as possible to the connector pins, especially on the USB 2.0 (D+/D−) and configuration channel (CC1/CC2) lines. For SuperSpeed differential pairs, use low-capacitance ESD devices (< 0.5 pF) to preserve signal integrity. Follow the USB4 ESD protection guidelines and consider adding series resistors (0 Ω or small values) for additional protection.

Reflow Profile Recommendations

Given the LCP housing, the USB-TC24-F30 is compatible with standard lead-free reflow profiles. Recommended reflow parameters: peak temperature 245–260°C, time above 217°C: 60–90 seconds, ramp rate: 1–2°C/sec. Avoid exceeding 260°C to prevent housing discoloration or deformation. Pre-baking is not required for LCP, but ensure components are stored in dry conditions per IPC/JEDEC J-STD-033.

Pro Tip: For optimal USB4 performance, consider using a 4-layer or 6-layer PCB stack-up with dedicated ground and power planes. The reference plane should be continuous beneath the differential pairs, and vias should be kept to a minimum to reduce stub effects.

Selecting the correct USB Type-C connector for your application involves understanding your system’s data rate, power, and mechanical requirements. Here is a decision framework to help you choose the right USB4 Type-C receptacle 24 pin for your design.

Step 1: Identify Your Data Rate Requirements

• USB 2.0 (480 Mbps): A 4-pin or 6-pin USB-C connector may suffice. No need for 24 pins.
• USB 3.2 Gen 1 (5 Gbps): A 16-pin connector with SuperSpeed pairs is required. 24-pin is optional.
• USB 3.2 Gen 2 (10 Gbps): Full 24-pin connector with low insertion loss and controlled impedance is recommended.
• USB4 (20–40 Gbps): A high-quality 24 pin USB-C receptacle with optimized shielding and contact design is mandatory. The USB-TC24-F30 is specifically engineered for this tier.

Step 2: Evaluate Power Delivery Needs

• Standard USB Power (5V/0.5A–1.5A): Basic 4-pin or 6-pin connector may work.
• USB PD (up to 100W): Requires 24-pin connector with dedicated VBUS and GND pins, plus CC1/CC2 for PD negotiation.
• USB PD 3.1 (up to 240W): 24-pin connector with robust contacts and low contact resistance is essential. The USB-TC24-F30’s high-conductivity copper contacts support extended power delivery.

Step 3: Consider Video Output (DisplayPort Alt Mode)

• No video output: A 16-pin or 24-pin connector without DP Alt Mode support may be acceptable.
• DP Alt Mode (4K/8K): Requires a USB4 Type-C connector with full 24-pin configuration, supporting the four SuperSpeed lanes used for video data.

Step 4: Assess Mechanical Constraints

• Board Space: If PCB area is limited, a single-row SMT connector like the USB-TC24-F30 offers a compact footprint.
• Mounting Type: Choose SMT for high-volume automated assembly or DIP (through-hole) for prototyping and extreme mechanical reliability. The USB-TC24-F30 is SMT-optimized.
• Orientation: Horizontal (right-angle) for edge-mounted ports; vertical for top-down insertion. The USB-TC24-F30 is a horizontal connector.

Step 5: Confirm Environmental and Reliability Requirements

• Operating Temperature: −40°C to +85°C (industrial) or −25°C to +70°C (commercial). The USB-TC24-F30 covers industrial ranges.
• Mating Cycles: 5,000 cycles for consumer devices; 10,000+ for industrial or docking applications. The USB-TC24-F30 supports 10,000+ cycles.
• Moisture & Corrosion: For medical or outdoor applications, the SUS304 shell and gold-plated contacts provide excellent resistance.

If your application requires high-speed data (40 Gbps), video output, and power delivery in a compact single-row SMT package, the USB-TC24-F30 is a strong candidate. Always review the full datasheet and PCB footprint before finalizing your design.