RDM6300 RFID RF Module UART Serial Output Card Reader 125kHz

RDM6300 Single Chip RFID RF Module – UART Serial Output Card Reader

The RDM6300 RFID RF Module is a compact, single-chip 125kHz radio frequency identification reader designed for seamless integration into DIY electronics, access control systems, automation projects, and Arduino/Raspberry Pi builds. Featuring a clean UART serial output, it makes reading standard 125kHz EM4100-compatible RFID cards and key fobs fast and straightforward — no complex decoding required.

Key Features

• Operating Frequency: 125 kHz — compatible with EM4100 and compatible RFID cards/tags
• UART Serial Output: Simple TTL serial communication (9600 bps) for easy microcontroller integration
• Single Chip Design: Compact RDM6300 chipset for space-saving PCB layouts
• Wide Compatibility: Works with Arduino, Raspberry Pi, ESP8266/ESP32, and most UART-capable microcontrollers
• Low Power Consumption: Ideal for battery-operated and embedded applications
• Reading Distance: Up to ~50mm depending on tag type and antenna configuration
• Onboard Antenna Connection: Supports external coil antenna for extended range
• Supply Voltage: DC 5V — straightforward power requirements

Perfect For

• DIY access control and door lock systems
• Attendance and time-tracking projects
• Arduino and Raspberry Pi RFID experiments
• Inventory tracking and asset tagging
• Maker spaces, prototyping, and electronics education

Technical Specifications

Explore More DIY & Electronics Essentials

Looking to expand your maker toolkit? Check out these related products from our store:

• Round Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire
• 4/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs

Learn more: EPA guidance on lithium-ion battery handling

Frequently Asked Questions

Q: What is the RDM6300 RFID RF Module and what does it do?

A: The RDM6300 is a single-chip 125kHz RFID reader module that outputs card data via UART serial communication. When a compatible 125kHz RFID card or key fob is brought within range, the module reads the card's unique ID and transmits it as a serial data string — making it easy to integrate into microcontroller projects for access control, identification, or automation tasks.

Q: Which microcontrollers is the RDM6300 RFID module compatible with?

A: The RDM6300 module communicates via standard TTL UART serial output at 9600 bps, making it compatible with virtually any microcontroller that supports serial communication — including Arduino (Uno, Mega, Nano), Raspberry Pi, ESP8266, ESP32, STM32, and more. Simply connect the TX pin to your microcontroller's RX pin and power the module at 5V.

Q: What types of RFID cards and tags work with the RDM6300 module?

A: The RDM6300 operates at 125kHz and is compatible with EM4100 and EM4100-protocol-compatible RFID cards, key fobs, and tags. It does NOT support 13.56MHz cards such as MIFARE or NFC tags — ensure your cards or tags are rated for 125kHz before purchase.

Q: How far can the RDM6300 module read RFID cards?

A: The read range is typically up to approximately 50mm (5cm), depending on the size and type of the RFID tag and the antenna coil used. Using a larger external antenna coil can help extend the effective read distance in your project.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.