MD9291 Ultra-Low-Power 13.56MHz RFID Reader Module, UART (TTL)
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Prices updated: 13 Oct 2026
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About this product
MD9291 is a 13.56 MHz RFID reader module with a UART (TTL) serial interface, compliant with ISO14443A and supporting Mifare One and Mifare UltraLight cards. It runs from 3.3 V to 5.5 V and measures 43 x 35 x 3 mm, making it easy to add card reading to microcontroller projects.
Specifications
- Standard
- ISO14443A
- Frequency
- 13.56 MHz
- Interface
- UART (TTL)
- Operating voltage
- 3.3V - 5.5V DC
- Operating current
- 14 mA (peak 20 mA)
- Baud rate
- 9600 - 115200 (default 9600)
- Supported cards
- Mifare One, Mifare UltraLight
- Size
- 43 x 35 x 3 mm
Frequently asked questions
How do I wire the MD9291 to an Arduino or ESP32?
Power the module from 3.3V to 5.5V and GND, then connect its TX and RX to the microcontroller's UART pins, crossing TX to RX. Match the logic level to your board (ESP32 uses 3.3V).
What baud rate should I use?
The factory default is 9600 baud, and the module supports speeds from 9600 up to 115200. Set your microcontroller to the same baud rate as the module.
