RS232 to TTL Converter Module with MAX3232 Chip and Female DB9 Connector

This RS232 to TTL converter module is built around the MAX3232 transceiver chip, providing a reliable and low-power solution for converting RS232 serial signals to TTL logic levels and vice versa. The MAX3232 integrates a dual line driver, a dual line receiver, and a dual charge-pump circuit with ±15 kV ESD protection on all serial-port connection pins, including GND. By using four small external capacitors, the charge pump eliminates the need for a dual power supply, allowing the module to operate from a single 3.3 V to 5.5 V source. It supports data signaling rates of up to 250 kbit/s with a maximum driver output slew rate of 30 V/µs, making it suitable for a wide range of serial communication tasks. One end of the module features a soldered female DB9 connector that can be plugged directly into the COM port of a PC, while the other end provides four header pins (TX, RX, VCC, GND) for easy connection to microcontrollers and other TTL-level devices via jumper wires. With its compact dimensions of 30.8 × 28.8 mm, this converter is a practical choice for prototyping, diagnostics, and embedded projects that require communication between RS232 equipment and TTL serial interfaces.