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Small black USB-A dongle with green 5-pin terminal block and three status LEDs

SMUGDESK

SMUGDESK UT-8851 USB 2.0 to TTL Serial Converter Adapter

SKU CH-XJDT-QJQ08

USB 2.0 to TTL serial adapter with 5-pin terminal block, auto-direction control, LED indicators and 300–921600 bps range for embedded debugging

  • Industrial-grade USB-to-TTL conversion with automatic data flow control
  • Wide baud-rate range from 300 bps up to 921600 bps with auto detection
  • 5-pin terminal block plus PWR/TXD/RXD LEDs for clear wiring and status monitoring
  • Bus-powered operation from -40 °C to 85 °C for harsh environments
  • Plug-and-play driver support across Windows 8/10/Linux/Mac for embedded debugging

Industrial USB 2.0 to TTL Adapter

The SMUGDESK UT-8851 converts a USB-A port to a TTL-level serial interface for embedded developers and industrial technicians. It supports Windows 8, 10, 7, XP, Vista, Linux, Mac OS and Windows CE after driver installation. The module is aimed at MCU debugging, Arduino programming, firmware upgrades and serial equipment maintenance where a reliable point-to-point link is required.

Terminal Block and LED Indicators

A green 5-pin terminal block provides screw-less connections for TXD, RXD, GND and VCC, simplifying wiring in the field. Built-in PWR, TXD and RXD LEDs give immediate visual confirmation of power status and real-time data flow direction. The USB 2.0 interface is backward compatible with USB 1.1 and 1.0 and draws power directly from the bus, removing the need for an external supply.

Wide Temperature and Baud Range

The adapter operates from -40 to 85 °C, making it suitable for harsh industrial environments. It handles baud rates from 300 to 921600 bps with automatic detection and auto data-flow control that eliminates RTS or DTR handshake wiring. Maximum transmission distance reaches 5 m for both USB and TTL cables when shielded wiring is used.

How it compares

Measured against everything we stock in USB Adapter Cables & Dongles, at today’s prices. Recalculated every night.

Price $21.99
Pricier than about 75% of the 1,430 comparable items (median $14.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What USB standard does the UT-8851 use, and what is the practical baud-rate ceiling?

It follows the USB 2.0 specification and is backward compatible with USB 1.1 and 1.0, supporting TTL baud rates from 300 bps up to 921600 bps with auto detection.

What physical connector and wiring distance does the terminal block allow?

A 5-pin green terminal block breaks out TXD, RXD, GND and VCC, and the module is rated for up to 5 m transmission distance on both USB and TTL sides when shielded cable is used.

How is the adapter powered and what driver step is required before use?

The unit is bus-powered from the USB port so no external supply is needed; install the appropriate driver for Windows 8, 10, 7, XP, Vista, Linux, Mac OS or Windows CE, then the device works plug-and-play.

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