USB-C Receptacle Pinout – 24-Pin SMT Mid-Mount Connector

The USB-C receptacle pinout for the USB-TC24-F24 is a full-featured USB Type-C female connector engineered for ultra-thin electronic devices requiring reduced board height. As a USB Type-C receptacle pinout, it delivers complete USB-C functionality including four SuperSpeed TX/RX differential pairs, USB 2.0 D+/D-, CC configuration channels, VBUS power, and SBU sideband signals.

This 24 pin USB-C receptacle features a mid-mount (sinking) SMT design with CL=0.5mm centerline height and 8.21mm body length, allowing the connector body to recess partially below the PCB surface. The USB-C mid mount connector design reduces the connector height above the PCB to just 0.5mm at the centerline, compared to 1.57mm for standard top-mount receptacles.

Manufactured under ISO 9001:2015 standards, this connector uses high-temperature LCP housing (UL94V-0) rated for 260°C reflow soldering and is fully compliant with RoHS 3 and REACH directives. Vistar Electronics offers free engineering samples and OEM/ODM customization for your ultra-slim device requirements.

For designs requiring stronger mechanical PCB retention over pure SMT mounting, see our 24-pin USB-C DIP+SMT hybrid mount receptacle.

The USB-C receptacle pinout (also called USB Type-C receptacle pinout) consists of 24 pins arranged in two rows of 12 (A and B sides). The following table provides the complete USB-C pin assignment for the 24-pin full-featured receptacle.

Pin assignments follow the USB Type-C Connector Specification, making the USB-TC24-F24 suitable for USB4, USB 3.2, and USB Power Delivery designs where the system architecture supports these standards.

USB-C Pin Functions Explained

VBUS and GND — The Power Backbone: USB-C carries four VBUS pins (A4, A9, B4, B9) and four GND pins (A1, A12, B1, B12). Running four power and four ground pins in parallel reduces contact resistance, minimizes voltage drop, and enables the 5A/240W power delivery capability of USB PD 3.1.

SuperSpeed Differential Pairs (TX/RX): The USB-C 24 pin pinout includes four SuperSpeed differential pairs: TX1+/− (A2/A3), RX1+/− (B11/B10), RX2+/− (A10/A11), and TX2+/− (B3/B2). These pairs support USB 3.2 Gen 2×2 (20 Gbps) and USB4 Gen 3 (40 Gbps) data rates.

Configuration Channel (CC1/CC2): Pins A5 (CC1) and B5 (CC2) detect plug orientation, establish power roles (source or sink), negotiate USB Power Delivery contracts, and enable Alternate Mode entry. Only one CC pin is active at a time — the other provides VCONN power for active cables.

USB 2.0 Data Lines (D+/D−) and Sideband Use (SBU1/SBU2): Pins A6/A7 and B6/B7 carry USB 2.0 data for backward compatibility. Pins A8 (SBU1) and B8 (SBU2) are used for Alternate Mode functions such as DisplayPort AUX or analog audio.

The USB-C PCB footprint for this 24-pin SMT mid-mount receptacle requires careful attention to pad design, via placement, and PCB cutout dimensions. These PCB layout guidelines are based on USB-IF specifications and industry best practices.

Recommended Land Pattern

• Pad Size: Follow the manufacturer’s recommended land pattern exactly — do not guess dimensions
• Via Placement: Use through-hole 8/16 mil vias (no blind or buried vias) for reliable connections
• Trace Spacing: Set differential pair spacing to 3 mil minimum (worst case)
• Via Tenting: Tent vias on top and bottom to prevent solder wicking

PCB Cutout for Mid-Mount Design

For this USB-C mid mount connector (also called sinking or recessed), a cutout must be routed in the PCB outline. The connector drops into the PCB cutout and is soldered in place. No circuitry can be placed underneath the connector as this section of the board is removed. PCB thickness options of 0.6mm or 0.8mm are commonly used.

High-Speed Routing Guidelines

• Place the Type-C connector at the board edge — prioritize routing high-speed differential pairs first, then CC signals, then power and ground
• Minimum recommended space between copper elements: 8 mil (0.203 mm)
• Use dedicated planes for power and ground to reduce jitter on USB signals
• Keep trace length to 1.5 inches (25-30 mm) or less for optimal signal integrity

The USB-C receptacle dimensions for this mid-mount connector are critical for PCB mechanical design and enclosure fit.

Key Dimensions

For complete mechanical drawings including PCB cutout dimensions, recommended land pattern, and 3D STEP models, refer to the USB Type-C Specification R2.0 or contact Vistar Electronics for manufacturer-specific documentation.

What Is a USB-C Receptacle Pinout?

A USB-C receptacle pinout is the complete mapping of electrical signals to the 24 pins of a USB Type-C female connector. This USB Type-C receptacle pinout defines every connection point including VBUS power, GND ground, SuperSpeed TX/RX high-speed lanes, USB2.0 D+/D-, CC configuration pins and SBU sideband pins. Mastering USB-C pin assignment is mandatory for hardware engineers and PCB layout designers developing consumer or industrial electronics.

The USB Type-C standard unifies legacy USB-A/B/Micro ports into one reversible connector, supporting 40Gbps USB4 data and up to 240W USB PD charging, plus video output via alternate mode protocols.

USB-C 24-Pin Pinout — Understanding the Signal Assignment

The USB-C 24 pin pinout splits contacts into two A/B rows each with 12 pins, which enables reversible plug insertion. When the cable is flipped, B-side pins take over all signal functions to keep data and power transmission stable.

Core pin function groups:

• VBUS (A4, A9, B4, B9): Power rail, compatible with USB PD 3.1 48V/5A power supply
• GND (A1, A12, B1, B12): Power return ground paths
• TX/RX Differential Pairs: Four groups of high-speed differential signals for USB4 40Gbps bandwidth
• D+/D−: Backward compatible USB 2.0 low-speed signal lines
• CC1/CC2: Detection & power negotiation control pins
• SBU1/SBU2: Auxiliary sideband for DP alt mode and analog audio

USB-C PCB Footprint and Layout Guidelines

Proper USB-C PCB footprint design ensures signal integrity and stable soldering yield for mid-mount Type-C connectors. Mid-mount variants require pre-routed PCB cutout where no circuit traces can be placed underneath the connector cavity; typical board thickness uses 0.6/0.8mm.

Layout best practices: strictly follow factory pad dimension specs, use 8/16mil through vias, separate high-speed differential traces with minimum 3mil gap, fully tent vias to avoid solder wicking. Place Type-C at PCB edge and route SuperSpeed lanes first for minimal signal loss.

USB-C Receptacle Dimensions and Mechanical Design

This USB-C mid mount connector features ultra-low 0.5mm centerline height and 8.21mm body length, allowing finished equipment total thickness under 8mm without sacrificing full USB4 & PD performance. Official mechanical drawings, PCB cutout templates and 3D STEP files are available via Vistar engineering support.

USB-C Mid-Mount Connector — Advantages for Ultra-Thin Devices

Compared to conventional top-mount Type-C sockets (1.57mm board height), mid-mount sinking design recesses connector into PCB cutout, drastically reducing the vertical space occupied inside slim laptops, tablets and portable monitors while retaining full 24-pin high-speed, high-power pin configuration.

USB-C Connector Pinout — 24-Pin vs 16-Pin vs 6-Pin

• 24-Pin Full Featured: USB4 40Gbps, DP Alternate Mode, 240W PD, full signal set
• 16-Pin: Only USB2.0 + max 100W charging, no SuperSpeed high-speed lanes
• 12-Pin: Simplified USB2.0 + PD layout with fewer contacts
• 6-Pin Charging Only: Basic power & USB2.0, no high-speed or video functions

Why Choose Vistar as Your USB-C Connector Manufacturer

Vistar Electronics specializes in full series USB-C receptacles, plugs and cable assemblies for consumer, communication and industrial hardware. All connectors pass RoHS 3 & REACH environmental compliance, support flexible small MOQ orders, and provide free engineering samples for prototype validation. Custom pin layouts, surface plating and tape&reel packaging are available for OEM/ODM mass production projects.

Access our technical blog and design resource library for detailed USB-C layout tutorials, connector selection guides by visiting the official Vistar website support page, or reach out to our sales team for custom project quotations.