RS232 to TTL Converter Module – SP3232, DB9, ESD Protection

RS232 to TTL Serial Converter Module with SP3232 Chip & ESD Protection

Bridge the gap between RS232 and TTL devices with this compact, reliable RS232 to TTL Converter Module. Powered by the high-performance SP3232 chip, this board delivers stable, high-speed serial level conversion for microcontrollers, development boards, embedded systems, and PC serial communication — all in a small 43.69 × 31.37 mm footprint.

Made in Mainland China.

Key Features

• RS232 ↔ TTL Level Conversion: Seamlessly converts standard RS232 signals to TTL-level signals compatible with microcontrollers (MCUs), Arduino, Raspberry Pi, and other embedded systems.
• SP3232 High-Performance Chip: Features the SP3232 bi-directional level converter for stable, reliable data transfer at high baud rates with minimal signal distortion.
• Wide Voltage Range: Operates on 3V–5.5V power supply, making it compatible with both 3.3V and 5V logic systems.
• ESD Protection: Built-in electrostatic discharge protection safeguards your components and ensures long-term reliability in demanding environments.
• Flow Control Support: Supports hardware flow control via CTS/RTS signals for more reliable data communication.
• Versatile Interfaces: Includes a DB9 female RS232 connector, UART TTL pin header interface, plus power and ground connections for flexible integration.
• Easy to Use: Plug-and-play design with clearly labeled pins and onboard power/data indicator LEDs for effortless monitoring.

Specifications

• Chip: SP3232
• Supply Voltage: 3V – 5.5V
• RS232 Interface: DB9 Female
• TTL Interface: UART pin header (VCC, GND, RxOUT, TxIN, CTS, RTS)
• ESD Protection: Yes
• Flow Control: CTS / RTS supported
• Board Dimensions: 43.69 × 31.37 mm (1.7 × 1.2 inch)
• Condition: New
• Origin: Mainland China

Pin Connections

• VCC: Connect to 3V–5.5V
• GND: Connect to Ground
• RxOUT: Connect to MCU.RX (Signal: MCU.RX ← SP3232 ← PC.TX)
• TxIN: Connect to MCU.TX (Signal: MCU.TX → SP3232 → PC.RX)
• CTS: Connect to MCU.CTS (Signal: MCU.CTS ← SP3232 ← PC.RTS)
• RTS: Connect to MCU.RTS (Signal: MCU.RTS → SP3232 → PC.CTS)

What's in the Box

• 1 × RS232 to TTL Converter Board (SP3232)
• 1 × 6-PIN Dupont Cable (Loose Head)

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Further Reading

For technical standards on serial communication and data interface safety, refer to the National Institute of Standards and Technology (NIST), which publishes guidelines on electronics, communications, and hardware interoperability standards.

Frequently Asked Questions

Q: What is an RS232 to TTL converter module used for?

A: An RS232 to TTL converter module, like this SP3232-based board, is used to translate the voltage levels of RS232 serial signals (typically ±12V) into TTL-compatible signals (3.3V or 5V) that microcontrollers such as Arduino, STM32, or Raspberry Pi can read and write. It allows you to connect legacy RS232 devices (e.g., PCs with DB9 ports) directly to modern embedded systems.

Q: What voltage does this RS232 to TTL module support?

A: This RS232 to TTL converter module supports a wide supply voltage range of 3V to 5.5V, making it compatible with both 3.3V and 5V logic-level microcontrollers and development boards without the need for additional level-shifting components.

Q: Does this module support hardware flow control?

A: Yes. This SP3232 RS232 to TTL converter board fully supports hardware flow control via CTS (Clear To Send) and RTS (Request To Send) signal lines, enabling more reliable communication in applications where data flow management is critical.

Q: Is ESD protection included on this RS232 converter board?

A: Yes, this module features built-in ESD (Electrostatic Discharge) protection, which helps protect your connected components and extends the lifespan of both the converter and the devices it interfaces with, especially in industrial or static-prone environments.

Q: What is included in the package?

A: The package includes 1 × RS232 to TTL Converter Board (SP3232 chip, DB9 female interface) and 1 × 6-PIN Dupont Cable (loose head) for easy connection to your MCU or development board.