TMUXHS4446RETR - USB-C 10Gbps Alt Mode Crossbar Mux | Texas Instruments
MPN： TMUXHS4446RETR ✓ 啟用中TMUXHS4446RETR 概覽
A crosspoint switch, also called a crossbar mux, is a type of analog signal switch that can route any of its input lanes to any of its output lanes in a non-blocking matrix fashion. Within the signal-routing hierarchy, it sits above simple SPDT analog switches and USB 2:1 muxes, offering full lane-level flexibility for multi-protocol interfaces. Crossbar muxes are key building blocks of USB-C Alternate Mode systems, where a single reversible connector must carry either USB SuperSpeed data or DisplayPort video depending on negotiation.
Key features include support for 10Gbps data rates compliant with USB 3.2 Gen2 and DisplayPort UHBR10, a passive switch architecture that adds no signal retiming or protocol awareness, integrated switching for the low-speed SBU (Sideband Use) lines used by the DisplayPort auxiliary channel, and a 7-ohm typical on-resistance that minimizes insertion loss. The 4-circuit, 4:4 configuration maps directly onto the four SuperSpeed differential lane pairs of a USB-C connector.
The passive, bidirectional architecture means the device does not distinguish between source and sink: signals pass equally well in either direction, simplifying orientation and role handling in USB-C designs. Wide, flat differential lanes are laid out inside the WQFN-40 to maintain controlled impedance and low crosstalk at multi-gigabit speeds.
Typical applications include USB-C docking stations, laptop and tablet USB-C Alternate Mode ports, USB-C monitors and display adapters, and multi-function hubs that multiplex USB 3.2 Gen2 and DisplayPort 1.4/2.1 over the same connector.
Design consideration: at 10Gbps, keep the passive high-speed lanes short, impedance-controlled, and decoupled from the switching-control logic; insertion loss and via stubs matter more than with low-speed muxes.
This page synthesizes distributor pricing, package data, application guidance, and design notes not found in a single manufacturer datasheet.
直接替換替代品，適用於 TMUXHS4446RETR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品TMUXHS4446RETR 最大額定值與電氣特性
| Product Type | High-speed bidirectional passive crosspoint switch (crossbar mux) |
| Configuration | 4 Circuit, 4:4 switch |
| 資料速率 | 10 Gbps |
| Supported Protocols | USB 3.2 Gen2 SuperSpeed, DisplayPort 1.4/2.1 (UHBR10) |
| On-Resistance (Typ) | 7 ohm |
| SBU Switching | Yes (low-speed sideband for DisplayPort aux channel) |
| Architecture | Passive, bidirectional (no protocol awareness) |
| 封裝 | 40-WQFN (6x3 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +105C |
| Packaging | Tape & Reel (RETR) |
| RoHS 狀態 | Compliant |
| Application | USB-C Alternate Mode switching (USB 3.2 Gen2 / DisplayPort) |
TMUXHS4446RETR 40-wqfn (6x3 mm) 腳位配置指南
TMUXHS4446RETR（40-wqfn (6x3 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： TMUXHS4446RETR.
請參閱 資料表 以查看完整腳位配置。
典型應用
TMUXHS4446RETR 適用於 6 應用s: USB-C Docking Stations, Notebook and Tablet USB-C Ports, USB-C Monitors and Display Adapters, Multi-Port USB Hubs, Consumer Electronics USB-C Accessories, Industrial Computing and Embedded Display Interfaces.
USB-C Docking Stations
The TMUXHS4446RETR fits USB-C docking stations because it routes all four SuperSpeed differential lane pairs as a 4:4 passive crossbar at 10Gbps, covering USB 3.2 Gen2 and DisplayPort 1.4/2.1 UHBR10 alternate modes negotiated on the same connector. Its 7-ohm typical on-resistance and passive bidirectional lanes keep insertion loss low enough to preserve the link budget after connector, ESD, and PCB trace losses. Integrated SBU switching handles the DisplayPort auxiliary channel, removing the need for a separate 2-channel low-speed mux. Place the device close to the Type-C receptacle with short, 90-ohm impedance-controlled differential pairs and symmetric via placement to keep crosstalk within spec at UHBR10 rates.
推薦
Notebook and Tablet USB-C Ports
In notebook and tablet designs, one USB-C receptacle must serve charging, USB 3.2 Gen2 data, and DisplayPort video. The TMUXHS4446RETR's passive crossbar lets the platform map any host lane to any connector lane, which simplifies orientation and alternate-mode configuration handled by the USB-C PD controller. The 10Gbps UHBR10 capability future-proofs the port for UHBR10 displays, while the -40C to +105C operating range covers thermally constrained enclosures. Because the switch is passive and protocol-unaware, it adds negligible latency and no retiming cost. Designers should budget for the mux insertion loss early in the channel simulation, keeping the mux within about 2 inches of the receptacle to preserve eye margin at Gen2 rates.
推薦
USB-C Monitors and Display Adapters
Display monitors and adapters that accept a single USB-C cable carrying DisplayPort video benefit from the TMUXHS4446RETR's ability to pass DP 1.4/2.1 main-link lanes at up to 10Gbps UHBR10 while simultaneously routing the SBU-based AUX channel used for link training and DDC/AUX transactions. The passive 4:4 crossbar topology supports the lane mapping variations that DP alternate mode allows, and the 7-ohm on-resistance minimizes amplitude droop on long trace runs from the receptacle to the scaler or DP-to-DMI bridge. Layout should treat the mux lanes as part of the overall 100-ohm differential channel: maintain symmetric reference planes, back-drill or stub-optimize vias, and place AC-coupling capacitors consistently on both sides of the switch.
推薦
Multi-Port USB Hubs
Multi-function hubs combining USB-C upstream with multiple downstream ports use the TMUXHS4446RETR to steer the four high-speed differential pairs from the upstream receptacle toward the hub controller or a DP output. Because the crossbar is non-blocking and bidirectional, the same silicon covers both upstream and downstream routing roles without polarity concerns, and protocol-aware retiming stays in the hub controller where it belongs. The 10Gbps rating preserves USB 3.2 Gen2 throughput to each path, while the low-speed SBU lanes route AUX for any DP alt-mode branch. Keep the control I2C/GPIO lines away from the high-speed lanes, and sequence the mux selection only while the link is idle to avoid glitching an active 10Gbps link.
推薦
Consumer Electronics USB-C Accessories
Consumer accessories such as USB-C travel docks, video adapters, and phone-to-monitor cables operate in dense enclosures with limited board area. The TMUXHS4446RETR's compact 40-WQFN 6x3 mm footprint consolidates lane switching and SBU routing into one device, saving the board area and cost of discrete SPDT switches and their control logic. Passive operation means no power is spent on equalization or retiming, keeping accessory power budgets aligned with USB-C v bus allocation. The 7-ohm on-resistance and 10Gbps support deliver Gen2 and UHBR10 performance in short cable-replacement-style channels. For accessory designs, verify MSL handling during reflow and include ESD protection rated for USB-C on the connector side of the mux.
推薦
Industrial Computing and Embedded Display Interfaces
Industrial computers, panel PCs, and embedded systems increasingly adopt USB-C ports for both data and display. The TMUXHS4446RETR's -40C to +105C operating range supports industrial enclosures that exceed consumer temperature limits, and its passive 4:4 crossbar routes USB 3.2 Gen2 or DisplayPort UHBR10 lanes selected by the system's embedded controller. The protocol-agnostic passive path avoids firmware complexity - the mux state is set by simple GPIO or I2C control - which suits long-lifecycle industrial platforms where software maintenance is costly. Designers should provide a default safe mux state at power-up, add provision to disable the high-speed lanes during hot-plug, and follow the WQFN thermal-pad land pattern for reliable solder joints under thermal cycling.
推薦
推薦產品摘要
工程參考資料，適用於 TMUXHS4446RETR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 40-WQFN (6x3 mm) |
| Brand | Texas Instruments |
| Configuration | 4 Circuit, 4:4 crossbar |
| Data Rate | 10 Gbps (USB 3.2 Gen2 / DP UHBR10) |
| On-Resistance (Typ) | 7 ohm |
| SBU/AUX Switching | Yes, integrated |
| Architecture | Passive, bidirectional |
| Operating Temperature | -40C to +105C |
主要差異化特點
- Full 4:4 passive crossbar at UHBR10 rates (對比TI TMUXHS4428 family)
- Integrated SBU switching (對比Discrete high-speed mux solutions)
- Passive, bidirectional, protocol-unaware lanes (對比Retimer/redriver-based switching)
設計說明
At 10Gbps (USB 3.2 Gen2 / DP UHBR10), the TMUXHS4446RETR's passive lanes must be treated as part of the overall 100-ohm differential channel. Keep high-speed traces short, impedance-controlled, and symmetric; minimize via transitions and use back-drilling or stub optimization where layer changes are unavoidable. Place the mux within roughly two inches of the Type-C receptacle and route the mux-to-connector segment identically for each lane pair to control intra-pair skew and crosstalk. Simulate the complete channel including the 7-ohm on-resistance, ESD structures, and AC-coupling caps before finalizing stackup.
The 40-WQFN 6x3 mm exposed-pad package requires a soldered thermal pad connected to a solid ground plane with an array of thermal vias; this is important both for heat dissipation across the -40C to +105C range and for a low-inductance return path under the high-speed lanes. Do not route other signals under the WQFN's high-speed pin field. Use 10-ohm to 22-ohm (value per TI guidance) or direct low-impedance control-line routing for I2C/GPIO mux-select lines, and keep them physically separated from the differential pairs to prevent coupling of switching transients into active links.
Change the mux state only while the link is idle or disabled. Switching the crossbar during an active 10Gbps link causes glitching and link retraining or dropouts in USB 3.2 and DisplayPort systems. Coordinate mux control with the USB-C PD controller so lane configuration happens during Alternate Mode negotiation, before SuperSpeed lanes are enabled. Additionally, ensure the device's power-up default state routes lanes to a safe (disconnected) condition, and verify that ESD protection on the connector side does not add capacitance that erodes the Gen2/UHBR10 eye diagram.
合規資訊
RoHS compliance indicated by distributor listings. REACH, lead-free, halogen-free, and conflict-minerals status should be confirmed on the TI product page or material content declaration.
