RS-232 To TTL Conveter (MAX3232IDR)

Most of the MCUs use TTL levels, and the computer serial port generally uses 232 levels. If we want the computer to communicate with the MCU, we need this RS-232 To TTL Conveter (MAX3232IDR).

This module is based on Max3232, it supports multiple baud rate communication and theoretically supports communication up to 230400bps baud.


Product Version Changes Released Date
RS-232 To TTL Conveter (MAX3232IDR) Initial Sep 2018


  • Easy to use
  • Stable, high speed
  • High cost performance
  • ±15-kV ESD Protection
  • Low power consumption
  • Two Drivers and Two Receivers


Item Value
Supply Voltage 3.3V / 5V
Driver input voltage 0V ~ 5.5V
Receiver input voltage -25V ~ +25V
Supply current(No load) 0.3mA
Operating free-air temperature -40℃ ~ 85℃
Storage temperature range -65℃ ~ 150℃
Maximum data rate 250 Kbit/s
Support baud rate 300bps ~ 230400bps
Size L: 35mm W: 30mm H: 15mm
Weight 10.9g
Package size L: 150mm W: 100mm H: 15mm
Gross Weight 14g


When using a higher baud rate, you need to pay attention to whether the connected MCU supports it.

Typical Applications

  • Hand-Held Equipment
  • Palmtop PCs

Hardware Overview

Pin Out

Getting Started

This is a simple module that only needs to connect the corresponding interface to the corresponding device to transfer data using the serial port tool. You should note that when connecting a TTL device, the RX pin of the module needs to be connected to the TX pin of the device, and vice versa, the TX pin of the module needs to be connected to the RX pin of the device.

Schematic Online Viewer


Tech Support

Please do not hesitate to submit the issue into our forum