Part: Adafruit CH334F Mini USB Hub Breakouts

Type: USB 2.1 Hub Breakout Board

Description: Compact breakout board featuring a CH334F USB 2.1 hub chip, converting one high-speed USB port into either two or four downstream ports, designed for embedding into enclosures or existing devices.

Operating Conditions:

• Supply voltage: 5V

Key Specs:

• USB Standard: USB 2.1
• Upstream port: 1
• Downstream ports: 2 or 4
• Upstream connection options: USB C port, 0.1" header pins
• Downstream connection type: 4-pin pads
• Data speed: High-speed

Features:

• Compact design
• Status LEDs for each port
• Jumper to disable LEDs
• Four mounting holes

Applications:

• Connecting multiple devices to USB host boards (e.g., embedded Linux)
• Creating multi-device USB peripherals
• Embedding into enclosures or existing devices

Package:

• Breakout board

CH334F QFN-24(4x4) Pinout

Notes

• Package: QFN-24 (4×4 mm)
• Power: Single +5V supply (Pin 4); multiple GND pins for thermal and electrical stability
• USB Ports: Four downstream USB ports (Port1–Port4) plus one upstream Host port (D+/D- on pins 2–3)
• Pinout identical for both variants: The 4-Port and 2-Port versions share the same CH334F IC and pinout; the 2-Port variant simply does not populate Port3 and Port4 connectors on the breakout board
• NC pins: Pins 18–19 are not connected on the IC itself