Easily Integrated: All-in-one RFID reader module with integrated microcontroller, analog circuit, and antenna driver requires only an antenna and power supply to function

Compact Size: Just 2.7 x 2.2 cm, perfect for space-constrained applications, with 2mm pitch low-profile pins for easy installation

Automatic Operation: Independently processes RF signals, demodulates and decodes tag data without an external controller

Supports Multiple Transponders: The module is compatible with Atmel/Temic T55xx tags (e.g., T5557, T5567, T5577) and widely-used EM4100/02, TK4100 tags. It also supports both Manchester RF/32 and Manchester RF/64 modulations

Wide Operating Voltage Range: Supports both 3.3V and 5V power supplies

Flexible Communication Interfaces: UART and I2C options for seamless integration

Read Range: Offers a practical read range of 5-10 cm (2-4 inches), with a typical read range of 7.5 cm (approximately 3 inches), varying based on tag type and antenna size

GPIO Control: Non-blocking GPIO control including Buzzer, LED, and Relay support

Customizable Firmware: Upgradeable firmware for tailored applications

Pin-to-Pin Compatibility: Drop-in replacement for 13.56 MHz RFID module SM5210-MINI, requiring only an antenna change

Upgrade-able: Integrated bootloader for easy firmware updates and custom firmware development

Wiegnad 26-bit Output: Supports programmable Wiegand 26-bit output format

Long-Term Availability: Over 10 years of lifecycle support ensures long-term viability

Second Gen: 125 kHz RFID Mini Module for proximity card applications

The SM1250B-MINI is a highly integrated 125 kHz RFID reader module, encapsulating the power of a ARM® Cortex® microcontroller, analog circuit, and antenna driver within a single compact package. This module is designed to provide OEMs with a reliable, cost-effective solution for embedding RFID functionality into their products, offering ease of integration and robust performance across a wide range of RFID proximity card applications.

This design represents an enhancement of Sonmicro's pioneering, legacy SoC-based RFID IC, named SM125-IC, and encapsulates years of innovation and proprietary technology.

Its streamlined design eliminates the need for external amplifiers, filters, and microcontrollers, significantly reducing overall system cost and complexity.

Alternative Form Factors

Standardized Packages for Versatility

Sonmicro has standardized RFID modules with MINI20, SMD20, and uSMD20 package types, offering advantages such as pin-to-pin compatibility with cross-field modules between 125 kHz RFID and 13.56 MHz RFID Modules.

SM1251-SMD

For surface-mount applications, consider the SM1251-SMD module, which offers the same functionality as the SM1250B-MINI but in a surface-mount form factor, ideal for automated assembly processes.

SM125-M2

For plug-and-play usage, the SM125-M2 features 2.54mm pitch standard pin headers, making it easy to integrate into your existing designs with compatible standard pin sockets on the motherboard. Functionalities are identical to the SM1250B-MINI, with the only difference being the form factor.

Tailored for Proximity Card Applications

The SM1250B-MINI module is designed for compatibility with a variety of transponders, including Atmel/Temic T55xx and the widely used EM4100/02. It supports both Manchester RF/32 and Manchester RF/64 modulations. Engineered for simplicity, it requires only an antenna and a power supply to function effectively. The module automatically demodulates and decodes RF signals, preparing the actual tag data for immediate use.

Compact and Complete

Includes all necessary components for a 125 kHz RFID reader, except the antenna.

Automatic Functionality

Independently performs all necessary signal processing; no external controller required.

Flexible Interfaces

Offers UART (up to 115200bps) and I2C (up to 400KHz) communication options.

Customizable Outputs

Features controllable General Purpose Outputs and Inputs, with a programmable Wiegand 26-bit output format.

Firmware Flexibility

The module's firmware is upgradeable to accommodate custom-specific applications, enhancing its adaptability to future needs.

Application-Driven Design

Ideal for embedding into products such as access control systems, the SM1250B-MINI supports a wide array of applications due to its small size and powerful features. It is particularly suited for designers seeking to integrate RFID functionalities without the bulk or complexity of traditional designs.

Advanced Features and Benefits

Wide Range of Power Supply

The SM1250B-MINI works with both 3.3V and 5V power, giving you the flexibility to use it in most existing systems.

Future-Proof Design with Integrated Bootloader

The SM1250B-MINI features a built-in bootloader, a valuable tool for keeping your device up to date. This bootloader allows for:

Easy firmware updates

Ensures your device benefits from the latest features and performance improvements.

Custom firmware development:

Enables you to tailor the module's functionality to your specific application needs.

Pin-to-Pin Compatibility

The SM1250B-MINI uses the same pin layout with its popular counterpart, the 13.56 MHz RFID module SM5210-MINI This thoughtful design allows for easy integration into existing designs, reducing development time and costs. Swapping the modules requires only a change of the antenna, eliminating the need for a complete redesign. The same baseboard can be used for both 125 kHz and 13.56 MHz RFID applications.

Plug-and-Play Installation

Effortless Setup

The SM1250B-MINI features convenient 2mm pin headers that allow for simple plug-and-play installation when used with compatible motherboard sockets. This eliminates the need for soldering, saving you time and effort during assembly.

Surface Mount Option Available

If your project requires surface mounting, consider the SM1251-SMD module, a variation designed for automated assembly processes.

Advanced Customization Options

We offer customization services tailored to meet specific project needs, from custom firmware development to complete system design. Whether adjusting form factors, antenna designs, or integration protocols, our goal is to ensure that the SM1250B-MINI not only meets but exceeds your project requirements.

Contact us today to explore how the SM1250B-MINI can enhance your product offerings with its advanced features, reliability, and scalability.