This article covers j5create USB C 4K トリプルディスプレイハブ.

Overview

The j5create JCD397 is a versatile USB-C docking station designed to transform a compatible laptop into a full triple-display workstation. Leveraging DisplayPort 1.4 and Multi-Stream Transport (MST), it drives up to three 4K monitors simultaneously via two HDMI ports and one DisplayPort output. Each video port supports up to 3840×2160 at 60Hz, but the hub also offers higher refresh rate options: 2560×1440 at 144Hz over HDMI and 1920×1080 at 240Hz over DisplayPort. This flexibility makes it suitable for both creative professionals and casual gamers who want smooth motion on external displays. Beyond video, the JCD397 packs three SuperSpeed 10Gbps ports (two USB-C, one USB-A), a SD 4.0 & microSD 4.0 card reader (UHS-II, up to 312MB/s), a Gigabit Ethernet port, and 100W Power Delivery 3.0 pass-through charging. It's a true all-in-one mini dock that cleans up your desk with a single USB-C connection.

Connectivity & Compatibility

Host Connection: USB-C (USB 3.2 Gen2, 10Gbps). Works with Thunderbolt 4/3 ports, but requires DisplayPort Alt Mode and MST support on the host for multi-monitor output. Operating Systems: Windows 10/11 fully supports triple display via MST. macOS supports only mirroring or single extended display (no MST support). Mac users should not expect dual or triple extended displays. Video Outputs: HDMI x2 (4K@60Hz; one port supports 2560×1440@144Hz), DisplayPort x1 (4K@60Hz, 1920×1080@240Hz). Data Ports: USB-C x2 (10Gbps), USB-A x1 (10Gbps). All support peripheral connection and downstream charging (5V/1.5A). Networking: RJ-45 Gigabit Ethernet (Realtek RTL8153 chipset). Storage: SD 4.0 & microSD 4.0 card reader (UHS-II, up to 312MB/s). * Power: USB-C PD 3.0 input (100W pass-through). Powers the dock and charges the host laptop via a single cable.

Product Info

The j5create JCD397 was released around May 2022 and sits in the mid-to-high tier of USB-C docking stations. Its key differentiator is the combination of triple 4K output, 100W PD pass-through, 10Gbps USB ports, and a SD 4.0 card reader in a compact form factor. The price typically ranges around ¥18,000–¥22,000. The manufacturer offers a 2-year warranty. The package includes the dock, a USB-C cable (approx. 80cm), a 100W power adapter, and a quick-start guide.

Best Use Cases

Creative Professionals on Windows: Photographers, video editors, and 3D artists who need multiple high-resolution displays for their workflow will benefit greatly from the triple 4K setup. The SD 4.0 card reader also speeds up media transfer from cameras. However, macOS users should look elsewhere due to MST limitations. Business Users with a Single-Cable Desk Setup: If you use a laptop as a desktop replacement, the JCD397 lets you connect two external monitors, wired Ethernet, USB peripherals, and charge your laptop all through one USB-C cable. The 100W PD is sufficient for most 14–16 inch ultrabooks and many mainstream laptops. * Casual Gamers Seeking High Refresh Rates: The ability to output 1440p at 144Hz or 1080p at 240Hz makes this dock a good match for gamers who play on external monitors. Note that there may be slight input lag compared to a direct GPU connection, so competitive esports players might prefer a direct connection.

Things to Consider

MST Support is Mandatory for Triple Displays: To use three extended displays, your laptop's USB-C port must support both DisplayPort Alt Mode and MST. Many business-class laptops (e.g., Dell XPS, Lenovo ThinkPad, HP EliteBook) support this, but consumer models may not. Always check your PC's specifications before purchasing. macOS Users: Limited to Single Extended Display: macOS does not support MST, so the JCD397 cannot drive dual or triple extended displays on a Mac. Mac users should consider DisplayLink-based docks for multi-monitor setups. Actual PD Charging Power Varies: The 100W rating is the total power input to the dock. After the dock's own consumption, the remaining power is delivered to the host laptop. Actual charging speed depends on the laptop's power requirements and current load. Competitors: In the same price range, you'll find the Anker PowerExpand 11-in-1 and Cable Matters 12-in-1. The JCD397 stands out with its triple 4K output and SD 4.0 reader, but lacks DisplayLink support, making it less versatile for macOS users.

Product Disclosure (Amazon)

  • Manufacturer: j5create
  • Seller: Amazon US
  • Fulfilled by: Amazon US
  • ASIN: B09Y8QSVGG
  • Note: This article covers a manufacturer-made product based on Amazon listing details.