TTL to RS485 Module MAX3485 MCU Development Converter

TTL to RS485 Converter Module – MAX3485 | MCU Development Accessory

Upgrade your microcontroller projects with the GUANDO MAX3485 TTL to RS485 Converter Module — a robust, industrial-grade communication interface designed for reliable long-distance serial data transmission. Whether you're building industrial control systems, sensor networks, or embedded development setups, this compact SMD module delivers exceptional signal integrity and versatility.

Made in Mainland China.

Key Features

• Brand-New Industrial-Grade MAX3485 Chip — Certified new, imported chips capable of transmission distances spanning thousands of meters.
• ±15KV ESD Protection — Superior electrostatic discharge protection safeguards your components and connected devices.
• Up to 500 Kbps Error-Free Data Rate — Slew-rate-limited chip driver minimizes EMI and reduces signal reflections caused by improperly matched cable terminations, ensuring reliable high-speed communication.
• 1/4 Unit Load Receiver — Low-impedance design supports up to 128 devices on a single RS485 bus, ideal for multi-node networks.
• Industrial Temperature Range — Operates from -40°C to +85°C, making it suitable for demanding environments.
• Hot-Plug Capable — Safely connect or disconnect the module while powered — no device failure on hot-swap, unlike many standard 485 chips.
• Tantalum Electrolytic Capacitor Power Supply — Dual-capacitor design provides both high- and low-frequency power filtering for clean, stable operation.
• Dual Transient Suppression Diodes — Excellent over-voltage protection performance for enhanced circuit longevity.
• 10Ω Current Protection Resistor — SMD-designed to improve RS485 signal integrity on the bus.
• Terminals & Soldered Lead Holes — Easy debugging and secure fixed wiring; soldering leads further improves signal reliability.
• Single-Sided RS485 & TTL Signal Routing — Keeps signal quality high and maximizes signal integrity throughout the PCB.
• Large-Area Copper Pour — Reduces signal interference across the entire board surface.
• 2.54mm Pitch Through-Hole Pads — Ready for secondary development and easy breadboard or PCB integration.
• M3 Screw Mounting Holes — Standard M3 holes for convenient, reliable mechanical installation.
• 120Ω Termination Resistor — Onboard termination resistor (R16) can be shorted as needed for bus impedance matching.
• Status Indicator LEDs — Power, RXD, and TXD signal indicators for straightforward monitoring during development.
• Right-Angle Pin Headers — Included for convenient bench testing and prototyping.
• 3.3V & 5V Compatible — Supports both 3.3V and 5V logic levels for broad MCU compatibility.

Specifications

• Chip: MAX3485
• Package: SMD
• Supply Voltage: 3.3V / 5V
• Max Data Rate: 500 Kbps
• ESD Protection: ±15KV
• Operating Temperature: -40°C to +85°C
• Max Bus Devices: 128
• Termination Resistor: 120Ω (jumper-selectable)
• Mounting: M3 screw holes
• Country of Origin: Made in Mainland China

Who Is This For?

This module is ideal for electronics engineers, embedded systems developers, hobbyists, and makers who need a dependable TTL-to-RS485 bridge for Arduino, Raspberry Pi, STM32, ESP32, or any other MCU platform. It's equally at home in professional industrial control cabinets and DIY lab setups.

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Frequently Asked Questions

Q: What is the maximum number of devices I can connect to the RS485 bus using the MAX3485 module?

A: Thanks to the 1/4 unit load receiver impedance on this MAX3485 TTL to RS485 converter module, you can connect up to 128 devices on a single RS485 bus, making it excellent for large multi-node communication networks.

Q: Is the MAX3485 RS485 module compatible with both 3.3V and 5V microcontrollers?

A: Yes. This TTL to RS485 module supports both 3.3V and 5V logic signal levels, ensuring broad compatibility with popular MCU platforms such as Arduino (5V), STM32, ESP32, and Raspberry Pi (3.3V).

Q: Does this module support hot-plugging while the system is powered on?

A: Yes. The MAX3485 module is designed to support hot-plug operation, meaning you can connect or disconnect it while the bus is live without damaging the chip or other connected devices — a key advantage over many standard RS485 modules.

Q: What protection features does this RS485 converter module include?

A: The module features ±15KV ESD protection, dual transient suppression diodes for over-voltage protection, a 10Ω current protection resistor, and large-area copper pour for interference shielding — all working together to protect your circuit and ensure reliable data transmission.

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.