2021 Fix: Rtl9210b Datasheet

The Realtek RTL9210B-CG is a 10Gbps USB 3.2 Gen2 bridge controller designed to support both NVMe and SATA M.2 SSDs in a dual-protocol enclosure, utilizing a 68-pin QFN package. The chipset allows for automatic protocol detection and provides 10Gbps transfer speeds for NVMe drives, making it a standard in external storage enclosures as detailed in technical documentation. For detailed technical specifications, visit Realtek. RTL9210B-CG - Realtek

Key features (typical for RTL9210B, 2021 datasheet)

• Interface:
  • Host: USB 3.1 Gen 2 (10 Gbps) or USB 3.0/3.1 compatibility (max depends on product implementation)
  • Device: SATA III (6.0 Gbps) downstream port for 2.5"/3.5" HDDs and SSDs
• Protocol support:
  • UASP (USB Attached SCSI Protocol) for improved performance over BOT (Bulk-Only Transport)
  • S.M.A.R.T. passthrough support (drive SMART reporting)
  • ATA/ATAPI command support and likely NCQ (Native Command Queuing) passthrough
• Performance:
  • Supports up to SATA III throughput (theoretical 6 Gbps) limited by USB host link (10 Gbps for USB3.1 Gen2)
  • Optimized for low CPU overhead with UASP acceleration
• Power management:
  • USB bus-power and self-power modes supported
  • Power-saving features: partial and slumber modes, device sleep (devslp) may be supported depending on firmware/hardware
• Security & maintenance:
  • Likely supports hardware-level encryption pass-through if used with compatible enclosures (varies by firmware)
  • Firmware upgradable via vendor-specific tools
• Physical/other:
  • Single SATA port, integrated PHYs for USB and SATA
  • Typical package: QFN or equivalent (check datasheet package drawing)
  • Operating temperature range typical for consumer controllers (0°C to 70°C) — check datasheet for exact spec

Power & Ground Pins

• VDDCORE (Pins 5, 20, 33, 48): 1.05V – Connect to a low-noise LDO (e.g., Richtek RT9013). Bypass with 10 µF + 0.1 µF per pin.
• VDDIO (Pins 12, 29, 41, 60): 3.3V – Shared with flash IC and EEPROM.
• VDD_PCIE (Pin 38): 3.3V dedicated for PCIe termination resistors.
• EPAD (Center pad): Must be soldered to ground with at least 9 thermal vias.

9. Comparison with Competitors (Based on 2021 Version)

For engineers selecting a bridge IC in 2021, the datasheet includes a competitive table (likely for internal use):

| Feature | RTL9210B | ASMedia ASM2362 | JMicron JMS583 | | :--- | :--- | :--- | :--- | | Max PCIe Speed | Gen 3 x2 | Gen 3 x2 | Gen 3 x2 | | UASP Support | Full | Full | Partial (no TRIM) | | Operating Temp (max) | 85°C | 70°C | 80°C | | 4Kn Drive Support | Yes (2021 FW) | No | Via beta FW | | Price (2021, 1k units) | $2.85 | $4.20 | $2.60 |

The RTL9210B excels in temperature tolerance, while the ASM2362 offers slightly lower power at idle. rtl9210b datasheet 2021

USB 3.1 Gen 2 Interface

• USB_SS_TX+/-, USB_SS_RX+/- (Pins 52-55): 100-ohm differential pairs. Series capacitors of 100 nF are required on both TX and RX lines.
• USB_HS_DP/DM (Pins 58, 59): For USB 2.0 fallback. Route as 90-ohm differential.

Summary Comparison (Contextual)

When looking at the 2021 datasheets, the RTL9210B positioned itself as the "cool and stable" option:

• vs. JMicron JMS583: The RTL9210B runs significantly cooler and consumes less power, though the JMS583 was often slightly cheaper.
• vs. ASMedia ASM2362: The ASM2362 supports USB 3.2 Gen 2x2 (20Gbps), whereas the RTL9210B is capped at 10Gbps. However, the RTL9210B is preferred for standard 10Gbps enclosures due to better macOS compatibility and thermal efficiency.

Realtek RTL9210B-CG is a dual-protocol USB bridge that acts as a "host" for both PCIe/NVMe and SATA drives, allowing for automatic switching between the two. Key Technical Specifications Host Interface : USB 3.1 Gen 2 (up to 10Gbps). Device Interfaces : PCIe Gen3 x2 (up to 16Gbps bandwidth). : SATA Gen3 (up to 6Gbps). Auto-Switching

: Uses the PEDET interface to detect and switch between PCIe and SATA modes automatically. Power Management The Realtek RTL9210B-CG is a 10Gbps USB 3

: Supports link power management (PCIe L1.Off and L1.Snooze) and dynamic switching power states for efficiency. : 68-pin QFN Green package. Reference Design & Schematics

For hardware development, detailed 2020-2021 period documentation includes: Official Datasheet RTL9210B-CG Datasheet Rev 1.1

(released June 19, 2020) provides pinout and electrical characteristics. Demo Board Schematic RTL9210 68-Pin Demo Board Schematic outlines essential connections for power, M.2, and USB. Firmware & Tools Interface:

As of early 2021, firmware updates improved compatibility for varied SSD models. Update Tools : Most updates use the UTHSB_MPtool on Windows. Unbricking

: If the controller becomes unresponsive, it can be forced into internal ROM mode by shorting Pins 1 (CS#) and 8 (VCC) of the SPI flash memory chip during connection. Community Resources bensuperpc/rtl9210 GitHub repository

10. Where to Find the Official 2021 RTL9210B Datasheet

The full rtl9210b datasheet 2021 (PDF, 72 pages, version 1.4) is not hosted on Realtek’s public website (requires an NDA for direct download). However, authorized distributors and archive sources from 2021 include:

• Winbond & WCH application notes (reproduced with permission).
• Realtek eMPST Portal (login required for registered customers).
• Archive.org Snapshots of tech community uploads (search for RTL9210B_DS_v1.4_2021.pdf).

Beware of fake datasheets: 2021 is a common forgery year. Check the following in any PDF you find:

• Page 1 should show "Revision 1.4 – June 2021".
• Page 23 must contain the SPI flash programming waveform.
• The thermal pad dimension on page 51 must be 5.2 x 5.2 mm (not 4.8 mm).

Where to get official details

• The full datasheet (including electrical characteristics, package drawings, register maps, and timing diagrams) is provided by Realtek or authorized distributors; obtain the official 2021 datasheet from Realtek support or your module/enclosure vendor.