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MAX3485ESA+

3.3V RS-485/RS-422 Half-Duplex Transceiver, 10Mbps, ±15kV ESD, SOIC-8

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Manufacturer Part：

MAX3485ESA+

Package：

SOIC-8 (5.0 x 4.0 x 1.5 mm)

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Description

Product Overview

The MAX3485ESA+ from Analog Devices (formerly Maxim Integrated) is a 3.3 V low-power RS-485/RS-422 transceiver with half-duplex communication, data rates up to 10 Mbps, and ±15 kV ESD protection in an 8-pin SOIC package.

Key Specifications

Type RS-485/RS-422 Transceiver (Half-Duplex)
Supply Voltage 3.3 V
Data Rate Up to 10 Mbps
Common-Mode Voltage Range -7 V to +12 V
Driver Output Voltage ±1.5 V min (54 Ohm load)
Receiver Input Impedance 1/4 Unit Load (96 kOhm min)
ESD Protection ±15 kV HBM on bus pins
Quiescent Current 1.2 mA (typical)
Shutdown Current 1 nA (typical)
Package SOIC-8 (5.0 x 4.0 mm)
Operating Temperature -40°C to 85°C

Features

  • 3.3 V single supply operation
  • 10 Mbps data rate for high-speed communication
  • Half-duplex operation with driver/receiver enable
  • ±15 kV ESD protection on bus pins
  • 1/4 unit load allows up to 128 devices on bus

Applications

  • Industrial automation and process control
  • RS-485/RS-422 network communication
  • Building automation and HVAC systems
  • Point-of-sale and security systems
  • Telecom equipment and level translation

The MAX3485ESA+ from Analog Devices (formerly Maxim Integrated) is a 3.3 V low-power RS-485/RS-422 transceiver designed for half-duplex communication on balanced transmission lines. It supports data rates up to 10 Mbps and features a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a single bus. The device includes driver and receiver enable pins for independent control. ±15 kV ESD protection on the bus pins provides robustness against electrostatic discharge events. The 1.2 mA quiescent current and 1 nA shutdown current make it suitable for power-sensitive applications. The device is pin-compatible with the industry-standard 75176 transceiver.

The MAX3485ESA+ consists of a differential line driver and a differential line receiver in a single package. The driver takes a single-ended TTL/CMOS input on the DI pin and converts it to a differential output on the A and B bus pins. The driver is enabled by the DE (Driver Enable) pin. The receiver takes a differential input from the A and B bus pins and outputs a single-ended signal on the RO (Receiver Output) pin. The receiver is enabled by the RE (Receiver Enable, active low) pin. In half-duplex mode, DE and RE are typically tied together so the device alternates between transmit and receive modes. The differential signaling provides high noise immunity and allows communication over long cable runs (up to 1200 meters at lower data rates). The 1/4 unit load input impedance (96 kOhm) minimizes bus loading, enabling more devices on the same network.

Pin Name Type Function
1 RO Output Receiver output
2 RE Input Receiver enable (active low)
3 DE Input Driver enable (active high)
4 DI Input Driver data input
5 GND Ground Ground
6 A I/O Non-inverting bus pin
7 B I/O Inverting bus pin
8 VCC Power 3.3V power supply
  • Industrial Modbus and Profibus RS-485 networks
  • Building automation BACnet MS/TP communication
  • DMX512 lighting control and stage equipment
  • Security system multi-drop communication buses
  • Point-of-sale terminal RS-485 serial links
Manufacturer Part Number Package Notes
Analog Devices MAX485ESA+ SOIC-8 5V version, 2.5Mbps
Texas Instruments SN65HVD08DR SOIC-8 3.3V RS-485, 20Mbps
onsemi AM26LV31CDR SOIC-8 RS-422 quad driver
STMicroelectronics ST3485EBDR SOIC-8 3.3V RS-485, 18Mbps
Renesas ISL3179EIBZ SOIC-8 3.3V RS-485, 30Mbps
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Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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