HC-12 433MHz Wireless Serial Module – 1000M Long Range

The HC-12 433MHz Wireless Serial Module is a compact, high-performance long-range wireless communication module designed for microcontroller projects, IoT applications, hobbyist builds, and professional embedded systems. With a transmission range of up to 1000 meters, UART TTL interface compatibility, and a wide supply voltage range of 3.2V–5.5V, this module is an exceptional choice for engineers and makers who need reliable, wire-free data communication over distance.

Operating on the 433.4–473.0 MHz frequency band, the HC-12 supports serial baud rates from 1200 to 115200bps (default 9600bps), making it easy to integrate into virtually any microcontroller platform — including Arduino, STM32, Raspberry Pi, and more. The ultra-compact SMD footprint (27.4 × 13.2 × 4 mm) keeps your builds clean and space-efficient.

Key Features

• Long-range wireless: Up to 1000m reference transmission distance
• 433MHz ISM band: Operating frequency 433.4–473.0 MHz
• UART TTL interface: 3.3V/5V compatible — works with most microcontrollers
• Wide supply voltage: 3.2V to 5.5V input
• Transmitting power: Up to 20dBm (max)
• Low idle current: Only 16mA
• Flexible baud rates: 1200 to 115200bps (default: 9600bps)
• Compact SMD package: 27.4 × 13.2 × 4 mm
• Wide operating temperature: -25°C to 75°C
• Antenna options: Spring antenna or antenna socket
• Customizable: Available in STM8S003F3U6 and STM8S003F3P6 variants

Specifications

Available Options

• Chip Variant: STM8S003F3U6, STM8S003F3P6
• Quantity: 1PC, 5PCS, 10PCS

What's Included

• HC-12 433MHz Wireless Serial Module (qty per selected option)
• Spring antenna or antenna socket (as configured)

Perfect For

Whether you're building remote sensor networks, drone telemetry links, smart home automation, or wireless data loggers, the HC-12 module delivers dependable long-range serial communication in a tiny, low-power package. It's a go-to component for Arduino enthusiasts and professional embedded developers alike.

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Frequently Asked Questions

Q: What microcontrollers are compatible with the HC-12 433MHz wireless serial module?

A: The HC-12 module communicates via standard UART TTL at 3.3V or 5V logic levels, making it compatible with a wide range of microcontrollers including Arduino (Uno, Mega, Nano), STM32, ESP8266, ESP32, Raspberry Pi (with logic level shifting), and virtually any platform with a hardware or software serial port.

Q: What is the effective wireless transmission range of the HC-12 module?

A: The HC-12 has a reference transmission distance of up to 1000 meters in open-air conditions with the default settings (maximum power, lowest baud rate). Real-world range may vary depending on obstacles, interference, antenna type, and environmental conditions.

Q: What is the difference between the STM8S003F3U6 and STM8S003F3P6 variants?

A: Both variants use the STM8S003F3 microcontroller core but differ in their package type. The STM8S003F3U6 uses a UFQFPN20 package (ultra-thin, surface-mount), while the STM8S003F3P6 uses a TSSOP20 package. Both offer the same core functionality for the HC-12 module — choose based on your specific PCB design or soldering preference.

Q: How do I change the baud rate or configure the HC-12 module?

A: The HC-12 is configured via AT commands sent through the UART serial interface while the SET pin is held LOW. You can adjust the baud rate (1200–115200bps), operating frequency channel, and transmission power through simple AT command strings using any serial terminal or microcontroller code.

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.