RTL9211DS - USB 3.2 Gen2 to SD Express Bridge Controller
料号： RTL9211DS ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
RTL9211DS 概述
An SD Express bridge controller is an interface IC that translates commands and data between a host protocol and an SD Express card. In this product, the USB 3.2 Gen2 side communicates with the host, while the SD Express side handles the card interface. This hierarchy places RTL9211DS at the intersection of USB bridge controllers, storage interface controllers, and computer interface semiconductors. The reported 985 MB/s figure describes the stated SD Express port data transmission speed; it should not be interpreted as guaranteed end-to-end throughput for every enclosure, host, card, operating system, or transfer workload.
Key verified features include USB 3.2 Gen2 connectivity, SD 8.0 and SD 7.1 protocol support, a stated 10 Gbps bridge-controller class, 985 MB/s SD Express transmission speed, and support for a theoretical 128 TB SD card. The Realtek product page identifies the RTL9211DS as suitable for several market segments, including desktop, mobile, workstation, server, communications platforms, and embedded systems. The associated SD Association material lists USB-interface reader implementations using RTL9211DS for detachable devices such as docking stations, dongles, and USB card readers.
The controller is appropriate when a product needs a compact USB-to-SD Express bridge rather than an internal PCIe-based reader. A USB host can enumerate the bridge, while the bridge manages the card-side interface and data transfer. Actual performance depends on USB link negotiation, host controller behavior, SD Express card capability, thermal conditions, firmware, and the selected mechanical implementation. The verified source does not provide a detailed timing, electrical, package, or pinout table, so designers should obtain the applicable Realtek technical documentation before final schematic capture or PCB release.
Typical applications include USB card readers, docking stations, portable storage accessories, workstation peripherals, and embedded systems that need removable SD Express storage over USB. For consumer products, the controller is relevant where SD Express is needed for higher transfer rates than legacy SD card interfaces. For embedded and industrial systems, it can support removable storage or controlled update media, subject to the mechanical and environmental requirements of the final product.
The main design consideration is validation: confirm the exact RTL9211DS package, exposed pins, power rails, reference circuitry, firmware requirements, and host compatibility using Realtek documentation. USB routing requires controlled impedance and careful connector, power, and return-path layout. Storage designs should also verify card insertion, removal, power-state transitions, thermal behavior, and enclosure grounding before production.
直接替换替代料： RTL9211DS ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： RTL9211DS （相同外形与封装尺寸） ——差异在于 Product Type, Target Applications.
快速对比工具——选择替代料号进行并排对比：
RTL9220DP
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →RTS5264
✅ 直接替换📋 参考替代料（不在目录中）
RTS5261
✅ 直接替换📋 参考替代料（不在目录中）
RTL9211DS 规格参数
| Product Type | USB 3.2 Gen2 to SD Express bridge controller |
| Host Interface | USB 3.2 Gen2 |
| Host Interface Data Rate | 10 Gbps |
| SD Express Port Speed | 985 MB/s |
| Supported SD Protocol | SD 8.0 and SD 7.1 |
| Maximum Theoretical SD Card Capacity | 128 TB |
| Target Applications | Desktop, mobile, workstation, server, communications platform, and embedded |
| Typical Device Form | Docking station, dongle, and USB card reader |
| Interface Category | Bridge controller |
| Storage Interface | SD Express |
| Manufacturer | Realtek |
RTL9211DS standard 引脚配置指南
RTL9211DS（standard 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： RTL9211DS.
请参阅 数据手册 以查看完整引脚配置。
典型应用
RTL9211DS 适用于 6 应用s: USB SD Express Card Reader, Docking Station Storage Module, Portable USB Storage Dongle, Workstation External Storage, Mobile Device Storage Accessory, Embedded Removable Storage.
USB SD Express Card Reader
The RTL9211DS fits a USB card reader because it bridges USB 3.2 Gen2 to SD Express storage, with Realtek reporting up to 985 MB/s on the SD Express port. The controller can sit between a USB-C or USB-A reader implementation and an SD Express card, reducing the need for a custom host-side storage interface. The design should preserve controlled USB impedance, provide stable power for the bridge and card, and validate card insertion and removal behavior. The stated 10 Gbps USB class and 985 MB/s SD Express figure describe link capabilities, while real user throughput will depend on the host, card, firmware, and workload.
推荐
Docking Station Storage Module
RTL9211DS is applicable to a docking station that exposes removable SD Express storage over USB. The verified SD Association material specifically identifies RTL9211DS with USB reader implementations including docking stations. In this arrangement, the dock can provide a user-accessible SD Express slot without requiring the host computer to expose a native SD Express or PCIe card interface. Designers should account for USB connector orientation, cable loss, power-enable sequencing, card detection, mechanical retention, and enclosure grounding. The controller’s reported 985 MB/s SD Express speed is useful for product positioning, but sustained transfer rate must be measured in the completed dock.
推荐
Portable USB Storage Dongle
The RTL9211DS can support a compact USB storage dongle that accepts SD Express media and presents it as a removable USB peripheral. Its USB 3.2 Gen2 interface is suitable for a modern host, while the SD Express side targets high-speed card access. A dongle implementation should minimize cable and connector loss, maintain USB signal integrity, and provide clean power for both the controller and the card. The verified Realtek data also identifies mobile and embedded applications, making the device class relevant to portable storage accessories. Before release, validate thermal rise, insertion cycles, unplug behavior, and compatibility across host operating systems.
推荐
Workstation External Storage
RTL9211DS is suitable for an external workstation storage accessory when the workstation relies on USB rather than an internal card slot. The controller provides a bridge from USB 3.2 Gen2 to SD Express, allowing high-capacity SD media to appear as a removable storage device. Realtek’s verified market list includes workstations and servers, while the stated theoretical capacity support reaches 128 TB. For workstation use, validate sustained throughput, thermal behavior, hot-plug behavior, filesystem support, and host compatibility. USB cable quality and the selected card can materially affect the achieved transfer rate, so the published 985 MB/s port figure should be treated as a maximum stated capability.
推荐
Mobile Device Storage Accessory
The RTL9211DS can be used in a mobile-oriented storage accessory that adds SD Express connectivity through USB. Realtek lists mobile among the suitable application segments, and the USB bridge architecture avoids requiring a dedicated SD Express host interface in the portable product. Implementation attention should focus on USB power budget, connector robustness, card access latency, and battery impact. The controller’s stated 10 Gbps USB class is appropriate for high-speed transfer, but practical energy use depends on link state, card activity, and system firmware. Validate suspend, resume, card removal, and thermal conditions across the intended host devices before production.
推荐
Embedded Removable Storage
RTL9211DS is relevant to an embedded system that needs removable SD Express media over a USB host interface. The controller can simplify the host-side connection when the embedded platform already supports USB but does not directly expose SD Express. The completed design must define startup behavior, card detection, filesystem ownership, read-only versus writable operation, and recovery after unexpected removal. Realtek identifies embedded applications among the supported markets, but the supplied evidence does not name a specific processor, bootloader, operating system, or driver. Those items should be verified as an integration package rather than assumed from the controller’s transfer-rate specification.
推荐
推荐产品汇总
工程参考数据： RTL9211DS ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | RTL9220DP | RTS5264 | RTS5261 |
|---|---|---|---|---|
| Product Category | USB 3.2 Gen2 to SD Express bridge controller | USB SD Express reader controller candidate | PCIe SD Express reader controller candidate | PCIe SD Express reader controller candidate |
| Brand | Realtek | Realtek | Realtek | Realtek |
关键差异点
- USB-to-SD Express bridge positioning （对比 RTS5264)
- Reported SD Express transfer capability （对比 RTL9220DP)
- Protocol and capacity positioning （对比 RTS5261)
设计说明
Treat the USB 3.2 Gen2 path as a controlled-impedance interface rather than a generic USB connection. Use the connector, controller, and transceiver geometry recommended by the current Realtek reference design, keep the USB differential pair continuous, and provide a continuous return path. Estimating the propagation delay or insertion loss is not possible from the supplied data, so use measured or manufacturer-provided constraints rather than guessed length limits.
Place USB and SD Express routing components close to their associated connector or controller pins, with short high-speed paths and carefully managed return-current continuity. Keep noisy switching and power-conversion nodes away from the USB differential pair. The verified sources do not provide a pinout or layout reference, so final trace width, spacing, via count, and stackup must follow the applicable Realtek design guidance.
Design the power tree for both the controller and the attached SD Express card. Estimate current draw from the actual card, USB source, controller state, and any inrush behavior, then size supply paths and decoupling using the datasheets for every component. The supplied RTL9211DS material does not specify operating voltage or current, so a numerical regulator selection or dissipation calculation would be speculative.
Do not equate the stated 985 MB/s SD Express port speed with guaranteed end-to-end transfer throughput. Validate sustained performance with the target host, USB cable, enclosure, SD Express card, filesystem, and application workload. Also test card insertion, removal, suspend, resume, short-circuit behavior, and power-cycle recovery because the verified product description does not specify these implementation details.
合规信息
The supplied Realtek product page and search results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.
